The list [1] of commits doing endianness fixes in USB subsystem is long
due to below quote from USB spec Revision 2.0 from April 27, 2000:

------------
8.1 Byte/Bit Ordering

Multiple byte fields in standard descriptors, requests, and responses
are interpreted as and moved over the bus in little-endian order, i.e.
LSB to MSB.
------------

This commit belongs to the same family.

[1] Example of endianness fixes in USB subsystem:
commit 14e1d56c ("usb: gadget: f_uac2: endianness fixes.")
commit 42370b82 ("usb: gadget: f_uac1: endianness fixes.")
commit 63afd5cc ("USB: chaoskey: fix Alea quirk on big-endian hosts")
commit 74098c4a ("usb: gadget: acm: fix endianness in notifications")
commit cdd7928d ("ACM gadget: fix endianness in notifications")
commit 323ece54 ("cdc-wdm: fix endianness bug in debug statements")
commit e102609f ("usb: gadget: uvc: Fix endianness mismatches")
       list goes on

Fixes: 132fcb46 ("usb: gadget: Add Audio Class 2.0 Driver")
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Reviewed-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Make sure only to copy any actual data rather than the whole buffer,
when releasing the temporary buffer used for unaligned non-isochronous
transfers.

Taken directly from commit 0efd937e ("USB: ehci-tegra: fix inefficient
copy of unaligned buffers")

Tested with Lantiq xRX200 (MIPS) and RPi Model B Rev 2 (ARM)
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

The commit 3bc04e28 ("usb: dwc2: host: Get aligned DMA in a more
supported way") introduced a common way to align DMA allocations.
The code in the commit aligns the struct dma_aligned_buffer but the
actual DMA address pointed by data[0] gets aligned to an offset from
the allocated boundary by the kmalloc_ptr and the old_xfer_buffer
pointers.

This is against the recommendation in Documentation/DMA-API.txt which
states:

  Therefore, it is recommended that driver writers who don't take
  special care to determine the cache line size at run time only map
  virtual regions that begin and end on page boundaries (which are
  guaranteed also to be cache line boundaries).

The effect of this is that architectures with non-coherent DMA caches
may run into memory corruption or kernel crashes with Unhandled
kernel unaligned accesses exceptions.

Fix the alignment by positioning the DMA area in front of the allocation
and use memory at the end of the area for storing the orginal
transfer_buffer pointer. This may have the added benefit of increased
performance as the DMA area is now fully aligned on all architectures.

Tested with Lantiq xRX200 (MIPS) and RPi Model B Rev 2 (ARM).

Fixes: 3bc04e28 ("usb: dwc2: host: Get aligned DMA in a more supported way")
Cc: <stable@vger.kernel.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Commit 34962fb8 ("docs: Fix more broken references") replaced the
broken reference to rockchip,dwc3-usb-phy.txt binding for the Qualcomm
DWC3 binding (qcom-dwc3-usb-phy.txt). That's wrong, so replace that
reference for the correct ones.

Fixes: 34962fb8 ("docs: Fix more broken references")
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

The tools/usb/ffs-test.c file defines cpu_to_le16/32 by using the C
library htole16/32 function calls. However, cpu_to_le16/32 are used when
initializing structures, i.e in a context where a function call is not
allowed.

It works fine on little endian systems because htole16/32 are defined by
the C library as no-ops. But on big-endian systems, they are actually
doing something, which might involve calling a function, causing build
failures, such as:

   ffs-test.c:48:25: error: initializer element is not constant
    #define cpu_to_le32(x)  htole32(x)
                            ^~~~~~~
   ffs-test.c:128:12: note: in expansion of macro ‘cpu_to_le32’
      .magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
               ^~~~~~~~~~~

To solve this, we code cpu_to_le16/32 in a way that allows them to be
used when initializing structures. This fix was imported from
meta-openembedded/android-tools/fix-big-endian-build.patch written by
Thomas Petazzoni <thomas.petazzoni@free-electrons.com>.

CC: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

The Aspeed SoC has a memory ordering issue that (thankfully)
only affects the USB gadget device. A read back is necessary
after writing to memory and before letting the device DMA
from it.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Variable maxpacket is being assigned but is never used hence it is
redundant and can be removed.

Cleans up clang warning:
warning: variable 'maxpacket' set but not used [-Wunused-but-set-variable]
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

For unidirectional endpoints, the endpoint pointer will be NULL for the
unused direction.  Check that the endpoint is active before
dereferencing this pointer.

Fixes: 1b4977c7 ("usb: dwc2: Update dwc2_handle_incomplete_isoc_in() function")
Fixes: 689efb26 ("usb: dwc2: Update dwc2_handle_incomplete_isoc_out() function")
Fixes: d8484552 ("usb: dwc2: Update GINTSTS_GOUTNAKEFF interrupt handling")
Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Fix build errors when built for PPC64:
These variables are only used on PPC32 so they don't need to be
initialized for PPC64.

../drivers/usb/phy/phy-fsl-usb.c: In function 'usb_otg_start':
../drivers/usb/phy/phy-fsl-usb.c:865:3: error: '_fsl_readl' undeclared (first use in this function); did you mean 'fsl_readl'?
   _fsl_readl = _fsl_readl_be;
../drivers/usb/phy/phy-fsl-usb.c:865:16: error: '_fsl_readl_be' undeclared (first use in this function); did you mean 'fsl_readl'?
   _fsl_readl = _fsl_readl_be;
../drivers/usb/phy/phy-fsl-usb.c:866:3: error: '_fsl_writel' undeclared (first use in this function); did you mean 'fsl_writel'?
   _fsl_writel = _fsl_writel_be;
../drivers/usb/phy/phy-fsl-usb.c:866:17: error: '_fsl_writel_be' undeclared (first use in this function); did you mean 'fsl_writel'?
   _fsl_writel = _fsl_writel_be;
../drivers/usb/phy/phy-fsl-usb.c:868:16: error: '_fsl_readl_le' undeclared (first use in this function); did you mean 'fsl_readl'?
   _fsl_readl = _fsl_readl_le;
../drivers/usb/phy/phy-fsl-usb.c:869:17: error: '_fsl_writel_le' undeclared (first use in this function); did you mean 'fsl_writel'?
   _fsl_writel = _fsl_writel_le;

and the sysfs "show" function return type should be ssize_t, not int:

../drivers/usb/phy/phy-fsl-usb.c:1042:49: error: initialization of 'ssize_t (*)(struct device *, struct device_attribute *, char *)' {aka 'long int (*)(struct device *, struct device_attribute *, char *)'} from incompatible pointer type 'int (*)(struct device *, struct device_attribute *, char *)' [-Werror=incompatible-pointer-types]
 static DEVICE_ATTR(fsl_usb2_otg_state, S_IRUGO, show_fsl_usb2_otg_state, NULL);
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: linux-usb@vger.kernel.org
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

When handling split transactions we will try to delay retry after
getting a NAK from the device. This works well for BULK transfers that
can be polled for essentially forever. Unfortunately, on slower systems
at boot time, when the kernel is busy enumerating all the devices (USB
or not), we issue a bunch of control requests (reading device
descriptors, etc). If we get a NAK for the IN part of the control
request and delay retry for too long (because the system is busy), we
may confuse the device when we finally get to reissue SSPLIT/CSPLIT IN
and the device will respond with STALL. As a result we end up with
failure to get device descriptor and will fail to enumerate the device:

[    3.428801] usb 2-1.2.1: new full-speed USB device number 9 using dwc2
[    3.508576] usb 2-1.2.1: device descriptor read/8, error -32
[    3.699150] usb 2-1.2.1: device descriptor read/8, error -32
[    3.891653] usb 2-1.2.1: new full-speed USB device number 10 using dwc2
[    3.968859] usb 2-1.2.1: device descriptor read/8, error -32
...

Let's not delay retries of split CONTROL IN transfers, as this allows us
to reliably enumerate devices at boot time.

Fixes: 38d2b5fb ("usb: dwc2: host: Don't retry NAKed transactions right away")
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

The change protects almost the whole body of u_audio_iso_complete()
function by PCM stream lock, this is mainly sufficient to avoid a race
between USB request completion and stream termination, the change
prevents a possibility of invalid memory access in interrupt context
by memcpy():

    Unable to handle kernel paging request at virtual address 00004e80
    pgd = c0004000
    [00004e80] *pgd=00000000
    Internal error: Oops: 817 [#1] PREEMPT SMP ARM
    CPU: 0 PID: 3 Comm: ksoftirqd/0 Tainted: G         C   3.14.54+ #117
    task: da180b80 ti: da192000 task.ti: da192000
    PC is at memcpy+0x50/0x330
    LR is at 0xcdd92b0e
    pc : [<c029ef30>]    lr : [<cdd92b0e>]    psr: 20000193
    sp : da193ce4  ip : dd86ae26  fp : 0000b180
    r10: daf81680  r9 : 00000000  r8 : d58a01ea
    r7 : 2c0b43e4  r6 : acdfb08b  r5 : 01a271cf  r4 : 87389377
    r3 : 69469782  r2 : 00000020  r1 : daf82fe0  r0 : 00004e80
    Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
    Control: 10c5387d  Table: 2b70804a  DAC: 00000015
    Process ksoftirqd/0 (pid: 3, stack limit = 0xda192238)

Also added a check for potential !runtime condition, commonly it is
done by PCM_RUNTIME_CHECK(substream) in the beginning, however this
does not completely prevent from oopses in u_audio_iso_complete(),
because the proper protection scheme must be implemented in PCM
library functions.

An example of *not fixed* oops due to substream->runtime->*
dereference by snd_pcm_running(substream) from
snd_pcm_period_elapsed(), where substream->runtime is gone while
waiting the substream lock:

    Unable to handle kernel paging request at virtual address 6b6b6b6b
    pgd = db7e4000
    [6b6b6b6b] *pgd=00000000
    CPU: 0 PID: 193 Comm: klogd Tainted: G         C   3.14.54+ #118
    task: db5ac500 ti: db60c000 task.ti: db60c000
    PC is at snd_pcm_period_elapsed+0x48/0xd8 [snd_pcm]
    LR is at snd_pcm_period_elapsed+0x40/0xd8 [snd_pcm]
    pc : [<>]    lr : [<>]    psr: 60000193
    Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
    Control: 10c5387d  Table: 2b7e404a  DAC: 00000015
    Process klogd (pid: 193, stack limit = 0xdb60c238)
    [<>] (snd_pcm_period_elapsed [snd_pcm]) from [<>] (udc_irq+0x500/0xbbc)
    [<>] (udc_irq) from [<>] (ci_irq+0x280/0x304)
    [<>] (ci_irq) from [<>] (handle_irq_event_percpu+0xa4/0x40c)
    [<>] (handle_irq_event_percpu) from [<>] (handle_irq_event+0x3c/0x5c)
    [<>] (handle_irq_event) from [<>] (handle_fasteoi_irq+0xc4/0x110)
    [<>] (handle_fasteoi_irq) from [<>] (generic_handle_irq+0x20/0x30)
    [<>] (generic_handle_irq) from [<>] (handle_IRQ+0x80/0xc0)
    [<>] (handle_IRQ) from [<>] (gic_handle_irq+0x3c/0x60)
    [<>] (gic_handle_irq) from [<>] (__irq_svc+0x44/0x78)
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
[erosca: W/o this patch, with minimal instrumentation [1], I can
         consistently reproduce BUG: KASAN: use-after-free [2]]

[1] Instrumentation to reproduce issue [2]:
 diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
 index a72295c953bb..bd0b308024fe 100644
 --- a/drivers/usb/gadget/function/u_audio.c
 +++ b/drivers/usb/gadget/function/u_audio.c
 @@ -16,6 +16,7 @@
  #include <sound/core.h>
  #include <sound/pcm.h>
  #include <sound/pcm_params.h>
 +#include <linux/delay.h>

  #include "u_audio.h"

 @@ -147,6 +148,8 @@ static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req)

 	spin_unlock_irqrestore(&prm->lock, flags);

 +	udelay(500); //delay here to increase probability of parallel activities
 +
 	/* Pack USB load in ALSA ring buffer */
 	pending = prm->dma_bytes - hw_ptr;

[2] After applying [1], below BUG occurs on Rcar-H3-Salvator-X board:
==================================================================
BUG: KASAN: use-after-free in u_audio_iso_complete+0x24c/0x520 [u_audio]
Read of size 8 at addr ffff8006cafcc248 by task swapper/0/0

CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        WC      4.14.47+ #160
Hardware name: Renesas Salvator-X board based on r8a7795 ES2.0+ (DT)
Call trace:
[<ffff2000080925ac>] dump_backtrace+0x0/0x364
[<ffff200008092924>] show_stack+0x14/0x1c
[<ffff200008f8dbcc>] dump_stack+0x108/0x174
[<ffff2000083c71b8>] print_address_description+0x7c/0x32c
[<ffff2000083c78e8>] kasan_report+0x324/0x354
[<ffff2000083c6114>] __asan_load8+0x24/0x94
[<ffff2000021d1b34>] u_audio_iso_complete+0x24c/0x520 [u_audio]
[<ffff20000152fe50>] usb_gadget_giveback_request+0x480/0x4d0 [udc_core]
[<ffff200001860ab8>] usbhsg_queue_done+0x100/0x130 [renesas_usbhs]
[<ffff20000185f814>] usbhsf_pkt_handler+0x1a4/0x298 [renesas_usbhs]
[<ffff20000185fb38>] usbhsf_irq_ready+0x128/0x178 [renesas_usbhs]
[<ffff200001859cc8>] usbhs_interrupt+0x440/0x490 [renesas_usbhs]
[<ffff2000081a0288>] __handle_irq_event_percpu+0x594/0xa58
[<ffff2000081a07d0>] handle_irq_event_percpu+0x84/0x12c
[<ffff2000081a0928>] handle_irq_event+0xb0/0x10c
[<ffff2000081a8384>] handle_fasteoi_irq+0x1e0/0x2ec
[<ffff20000819e5f8>] generic_handle_irq+0x2c/0x44
[<ffff20000819f0d0>] __handle_domain_irq+0x190/0x194
[<ffff20000808177c>] gic_handle_irq+0x80/0xac
Exception stack(0xffff200009e97c80 to 0xffff200009e97dc0)
7c80: 0000000000000000 0000000000000000 0000000000000003 ffff200008179298
7ca0: ffff20000ae1c180 dfff200000000000 0000000000000000 ffff2000081f9a88
7cc0: ffff200009eb5960 ffff200009e97cf0 0000000000001600 ffff0400041b064b
7ce0: 0000000000000000 0000000000000002 0000000200000001 0000000000000001
7d00: ffff20000842197c 0000ffff958c4970 0000000000000000 ffff8006da0d5b80
7d20: ffff8006d4678498 0000000000000000 000000126bde0a8b ffff8006d4678480
7d40: 0000000000000000 000000126bdbea64 ffff200008fd0000 ffff8006fffff980
7d60: 00000000495f0018 ffff200009e97dc0 ffff200008b6c4ec ffff200009e97dc0
7d80: ffff200008b6c4f0 0000000020000145 ffff8006da0d5b80 ffff8006d4678498
7da0: ffffffffffffffff ffff8006d4678498 ffff200009e97dc0 ffff200008b6c4f0
[<ffff200008084034>] el1_irq+0xb4/0x12c
[<ffff200008b6c4f0>] cpuidle_enter_state+0x818/0x844
[<ffff200008b6c59c>] cpuidle_enter+0x18/0x20
[<ffff20000815f2e4>] call_cpuidle+0x98/0x9c
[<ffff20000815f674>] do_idle+0x214/0x264
[<ffff20000815facc>] cpu_startup_entry+0x20/0x24
[<ffff200008fb09d8>] rest_init+0x30c/0x320
[<ffff2000095f1338>] start_kernel+0x570/0x5b0
---<-snip->---

Fixes: 132fcb46 ("usb: gadget: Add Audio Class 2.0 Driver")
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Substream period size potentially can be changed in runtime, however
this is not accounted in the data copying routine, the change replaces
the cached value with an actual value from substream runtime.

As a side effect the change also removes a potential division by zero
in u_audio_iso_complete() function, if there is a race with
uac_pcm_hw_free(), which sets prm->period_size to 0.

Fixes: 132fcb46 ("usb: gadget: Add Audio Class 2.0 Driver")
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

There is no necessity to copy PCM stream ring buffer area and size
properties to UAC private data structure, these values can be got
from substream itself.

The change gives more control on substream and avoid stale caching.

Fixes: 132fcb46 ("usb: gadget: Add Audio Class 2.0 Driver")
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

In u_audio_iso_complete, the runtime hw_ptr is updated before the
data is actually copied over to/from the buffer/dma area. When
ALSA uses this hw_ptr, the data may not actually be available to
be used. This causes trash/stale audio to play/record. This
patch updates the hw_ptr after the data has been copied to avoid
this.

Fixes: 132fcb46 ("usb: gadget: Add Audio Class 2.0 Driver")
Signed-off-by: Joshua Frkuska <joshua_frkuska@mentor.com>
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Fix below smatch (v0.5.0-4443-g69e9094e11c1) warnings:
drivers/usb/gadget/function/u_audio.c:607 g_audio_setup() warn: strcpy() 'pcm_name' of unknown size might be too large for 'pcm->name'
drivers/usb/gadget/function/u_audio.c:614 g_audio_setup() warn: strcpy() 'card_name' of unknown size might be too large for 'card->driver'
drivers/usb/gadget/function/u_audio.c:615 g_audio_setup() warn: strcpy() 'card_name' of unknown size might be too large for 'card->shortname'

Below commits performed a similar 's/strcpy/strlcpy/' rework:
* v2.6.31 commit 8372d498 ("ALSA: ctxfi - Fix PCM device naming")
* v4.14 commit 003d3e70 ("ALSA: ad1848: fix format string overflow warning")
* v4.14 commit 6d8b04de ("ALSA: cs423x: fix format string overflow warning")

Fixes: eb9fecb9 ("usb: gadget: f_uac2: split out audio core")
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

If usb_ep_autoconfig() fails (i.e. returns a null endpoint descriptor),
we expect afunc_bind() to fail (i.e. return a negative error code).

However, due to v4.10-rc1 commit f1d3861d ("usb: gadget: f_uac2: fix
error handling at afunc_bind"), afunc_bind() returns zero, telling the
caller that it succeeded. This then generates NULL pointer dereference
in below scenario on Rcar H3-ES20-Salvator-X target:

rcar-gen3:/home/root# modprobe g_audio
[  626.521155] g_audio gadget: afunc_bind:565 Error!
[  626.526319] g_audio gadget: Linux USB Audio Gadget, version: Feb 2, 2012
[  626.533405] g_audio gadget: g_audio ready
rcar-gen3:/home/root#
rcar-gen3:/home/root# modprobe -r g_audio
[  728.256707] ==================================================================
[  728.264293] BUG: KASAN: null-ptr-deref in u_audio_stop_capture+0x70/0x268 [u_audio]
[  728.272244] Read of size 8 at addr 00000000000000a0 by task modprobe/2545
[  728.279309]
[  728.280849] CPU: 0 PID: 2545 Comm: modprobe Tainted: G        WC      4.14.47+ #152
[  728.288778] Hardware name: Renesas Salvator-X board based on r8a7795 ES2.0+ (DT)
[  728.296454] Call trace:
[  728.299151] [<ffff2000080925ac>] dump_backtrace+0x0/0x364
[  728.304808] [<ffff200008092924>] show_stack+0x14/0x1c
[  728.310081] [<ffff200008f8d5cc>] dump_stack+0x108/0x174
[  728.315522] [<ffff2000083c77c8>] kasan_report+0x1fc/0x354
[  728.321134] [<ffff2000083c611c>] __asan_load8+0x24/0x94
[  728.326600] [<ffff2000021e1618>] u_audio_stop_capture+0x70/0x268 [u_audio]
[  728.333735] [<ffff2000021f8b7c>] afunc_disable+0x44/0x60 [usb_f_uac2]
[  728.340503] [<ffff20000218177c>] usb_remove_function+0x9c/0x210 [libcomposite]
[  728.348060] [<ffff200002183320>] remove_config.isra.2+0x1d8/0x218 [libcomposite]
[  728.355788] [<ffff200002186c54>] __composite_unbind+0x104/0x1f8 [libcomposite]
[  728.363339] [<ffff200002186d58>] composite_unbind+0x10/0x18 [libcomposite]
[  728.370536] [<ffff20000152f158>] usb_gadget_remove_driver+0xc0/0x170 [udc_core]
[  728.378172] [<ffff20000153154c>] usb_gadget_unregister_driver+0x1cc/0x258 [udc_core]
[  728.386274] [<ffff200002180de8>] usb_composite_unregister+0x10/0x18 [libcomposite]
[  728.394116] [<ffff2000021d035c>] audio_driver_exit+0x14/0x28 [g_audio]
[  728.400878] [<ffff200008213ed4>] SyS_delete_module+0x288/0x32c
[  728.406935] Exception stack(0xffff8006cf6c7ec0 to 0xffff8006cf6c8000)
[  728.413624] 7ec0: 0000000006136428 0000000000000800 0000000000000000 0000ffffd706efe8
[  728.421718] 7ee0: 0000ffffd706efe9 000000000000000a 1999999999999999 0000000000000000
[  728.429792] 7f00: 000000000000006a 000000000042c078 0000000000000000 0000000000000005
[  728.437870] 7f20: 0000000000000000 0000000000000000 0000000000000004 0000000000000000
[  728.445952] 7f40: 000000000042bfc8 0000ffffbc7c8f40 0000000000000000 00000000061363c0
[  728.454035] 7f60: 0000000006136428 0000000000000000 0000000000000000 0000000006136428
[  728.462114] 7f80: 000000000042c000 0000ffffd7071448 000000000042c000 0000000000000000
[  728.470190] 7fa0: 00000000061350c0 0000ffffd7070010 000000000041129c 0000ffffd7070010
[  728.478281] 7fc0: 0000ffffbc7c8f48 0000000060000000 0000000006136428 000000000000006a
[  728.486351] 7fe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  728.494434] [<ffff200008084780>] el0_svc_naked+0x34/0x38
[  728.499957] ==================================================================
[  728.507801] Unable to handle kernel NULL pointer dereference at virtual address 000000a0
[  728.517742] Mem abort info:
[  728.520993]   Exception class = DABT (current EL), IL = 32 bits
[  728.527375]   SET = 0, FnV = 0
[  728.530731]   EA = 0, S1PTW = 0
[  728.534361] Data abort info:
[  728.537650]   ISV = 0, ISS = 0x00000006
[  728.541863]   CM = 0, WnR = 0
[  728.545167] user pgtable: 4k pages, 48-bit VAs, pgd = ffff8006c6100000
[  728.552156] [00000000000000a0] *pgd=0000000716a8d003
[  728.557519] , *pud=00000007116fc003
[  728.561259] , *pmd=0000000000000000
[  728.564985] Internal error: Oops: 96000006 [#1] PREEMPT SMP
[  728.570815] Modules linked in:
[  728.574023]  usb_f_uac2
[  728.576560]  u_audio
[  728.578827]  g_audio(-)
[  728.581361]  libcomposite
[  728.584071]  configfs
[  728.586428]  aes_ce_blk
[  728.588960]  sata_rcar
[  728.591421]  crypto_simd
[  728.594039]  cryptd
[  728.596217]  libata
[  728.598396]  aes_ce_cipher
[  728.601188]  crc32_ce
[  728.603542]  ghash_ce
[  728.605896]  gf128mul
[  728.608250]  aes_arm64
[  728.610692]  scsi_mod
[  728.613046]  sha2_ce
[  728.615313]  xhci_plat_hcd
[  728.618106]  sha256_arm64
[  728.620811]  sha1_ce
[  728.623077]  renesas_usbhs
[  728.625869]  xhci_hcd
[  728.628243]  renesas_usb3
[  728.630948]  sha1_generic
[  728.633670]  ravb_streaming(C)
[  728.636814]  udc_core
[  728.639168]  cpufreq_dt
[  728.641697]  rcar_gen3_thermal
[  728.644840]  usb_dmac
[  728.647194]  pwm_rcar
[  728.649548]  thermal_sys
[  728.652165]  virt_dma
[  728.654519]  mch_core(C)
[  728.657137]  pwm_bl
[  728.659315]  snd_soc_rcar
[  728.662020]  snd_aloop
[  728.664462]  snd_soc_generic_card
[  728.667869]  snd_soc_ak4613
[  728.670749]  ipv6
[  728.672768]  autofs4
[  728.675052] CPU: 0 PID: 2545 Comm: modprobe Tainted: G    B   WC      4.14.47+ #152
[  728.682973] Hardware name: Renesas Salvator-X board based on r8a7795 ES2.0+ (DT)
[  728.690637] task: ffff8006ced38000 task.stack: ffff8006cf6c0000
[  728.696814] PC is at u_audio_stop_capture+0x70/0x268 [u_audio]
[  728.702896] LR is at u_audio_stop_capture+0x70/0x268 [u_audio]
[  728.708964] pc : [<ffff2000021e1618>] lr : [<ffff2000021e1618>] pstate: 60000145
[  728.716620] sp : ffff8006cf6c7a50
[  728.720154] x29: ffff8006cf6c7a50
[  728.723760] x28: ffff8006ced38000
[  728.727272] x27: ffff200008fd7000
[  728.730857] x26: ffff2000021d2340
[  728.734361] x25: 0000000000000000
[  728.737948] x24: ffff200009e94b08
[  728.741452] x23: 00000000000000a0
[  728.745052] x22: 00000000000000a8
[  728.748558] x21: 1ffff000d9ed8f7c
[  728.752142] x20: ffff8006d671a800
[  728.755646] x19: 0000000000000000
[  728.759231] x18: 0000000000000000
[  728.762736] x17: 0000ffffbc7c8f40
[  728.766320] x16: ffff200008213c4c
[  728.769823] x15: 0000000000000000
[  728.773408] x14: 0720072007200720
[  728.776912] x13: 0720072007200720
[  728.780497] x12: ffffffffffffffff
[  728.784001] x11: 0000000000000040
[  728.787598] x10: 0000000000001600
[  728.791103] x9 : ffff8006cf6c77a0
[  728.794689] x8 : ffff8006ced39660
[  728.798193] x7 : ffff20000811c738
[  728.801794] x6 : 0000000000000000
[  728.805299] x5 : dfff200000000000
[  728.808885] x4 : ffff8006ced38000
[  728.812390] x3 : ffff200008fb46e8
[  728.815976] x2 : 0000000000000007
[  728.819480] x1 : 3ba68643e7431500
[  728.823066] x0 : 0000000000000000
[  728.826574] Process modprobe (pid: 2545, stack limit = 0xffff8006cf6c0000)
[  728.833704] Call trace:
[  728.836292] Exception stack(0xffff8006cf6c7910 to 0xffff8006cf6c7a50)
[  728.842987] 7900:                                   0000000000000000 3ba68643e7431500
[  728.851084] 7920: 0000000000000007 ffff200008fb46e8 ffff8006ced38000 dfff200000000000
[  728.859173] 7940: 0000000000000000 ffff20000811c738 ffff8006ced39660 ffff8006cf6c77a0
[  728.867248] 7960: 0000000000001600 0000000000000040 ffffffffffffffff 0720072007200720
[  728.875323] 7980: 0720072007200720 0000000000000000 ffff200008213c4c 0000ffffbc7c8f40
[  728.883412] 79a0: 0000000000000000 0000000000000000 ffff8006d671a800 1ffff000d9ed8f7c
[  728.891485] 79c0: 00000000000000a8 00000000000000a0 ffff200009e94b08 0000000000000000
[  728.899561] 79e0: ffff2000021d2340 ffff200008fd7000 ffff8006ced38000 ffff8006cf6c7a50
[  728.907636] 7a00: ffff2000021e1618 ffff8006cf6c7a50 ffff2000021e1618 0000000060000145
[  728.915710] 7a20: 0000000000000008 0000000000000000 0000ffffffffffff 3ba68643e7431500
[  728.923780] 7a40: ffff8006cf6c7a50 ffff2000021e1618
[  728.928880] [<ffff2000021e1618>] u_audio_stop_capture+0x70/0x268 [u_audio]
[  728.936032] [<ffff2000021f8b7c>] afunc_disable+0x44/0x60 [usb_f_uac2]
[  728.942822] [<ffff20000218177c>] usb_remove_function+0x9c/0x210 [libcomposite]
[  728.950385] [<ffff200002183320>] remove_config.isra.2+0x1d8/0x218 [libcomposite]
[  728.958134] [<ffff200002186c54>] __composite_unbind+0x104/0x1f8 [libcomposite]
[  728.965689] [<ffff200002186d58>] composite_unbind+0x10/0x18 [libcomposite]
[  728.972882] [<ffff20000152f158>] usb_gadget_remove_driver+0xc0/0x170 [udc_core]
[  728.980522] [<ffff20000153154c>] usb_gadget_unregister_driver+0x1cc/0x258 [udc_core]
[  728.988638] [<ffff200002180de8>] usb_composite_unregister+0x10/0x18 [libcomposite]
[  728.996472] [<ffff2000021d035c>] audio_driver_exit+0x14/0x28 [g_audio]
[  729.003231] [<ffff200008213ed4>] SyS_delete_module+0x288/0x32c
[  729.009278] Exception stack(0xffff8006cf6c7ec0 to 0xffff8006cf6c8000)
[  729.015946] 7ec0: 0000000006136428 0000000000000800 0000000000000000 0000ffffd706efe8
[  729.024022] 7ee0: 0000ffffd706efe9 000000000000000a 1999999999999999 0000000000000000
[  729.032099] 7f00: 000000000000006a 000000000042c078 0000000000000000 0000000000000005
[  729.040172] 7f20: 0000000000000000 0000000000000000 0000000000000004 0000000000000000
[  729.048263] 7f40: 000000000042bfc8 0000ffffbc7c8f40 0000000000000000 00000000061363c0
[  729.056337] 7f60: 0000000006136428 0000000000000000 0000000000000000 0000000006136428
[  729.064411] 7f80: 000000000042c000 0000ffffd7071448 000000000042c000 0000000000000000
[  729.072484] 7fa0: 00000000061350c0 0000ffffd7070010 000000000041129c 0000ffffd7070010
[  729.080563] 7fc0: 0000ffffbc7c8f48 0000000060000000 0000000006136428 000000000000006a
[  729.088636] 7fe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  729.096733] [<ffff200008084780>] el0_svc_naked+0x34/0x38
[  729.102259] Code: 9597d1b3 aa1703e0 9102a276 958792b9 (f9405275)
[  729.108617] ---[ end trace 7560c5fa3d100243 ]---

After this patch is applied, the issue is fixed:
rcar-gen3:/home/root# modprobe g_audio
[   59.217127] g_audio gadget: afunc_bind:565 Error!
[   59.222329] g_audio ee020000.usb: failed to start g_audio: -19
modprobe: ERROR: could not insert 'g_audio': No such device
rcar-gen3:/home/root# modprobe -r g_audio
rcar-gen3:/home/root#

Fixes: f1d3861d ("usb: gadget: f_uac2: fix error handling at afunc_bind")
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

The driver may sleep in an interrupt handler.
The function call path (from bottom to top) in Linux-4.16.7 is:

[FUNC] r8a66597_queue(GFP_KERNEL)
drivers/usb/gadget/udc/r8a66597-udc.c, 1193:
		r8a66597_queue in get_status
drivers/usb/gadget/udc/r8a66597-udc.c, 1301:
		get_status in setup_packet
drivers/usb/gadget/udc/r8a66597-udc.c, 1381:
		setup_packet in irq_control_stage
drivers/usb/gadget/udc/r8a66597-udc.c, 1508:
		irq_control_stage in r8a66597_irq (interrupt handler)

To fix this bug, GFP_KERNEL is replaced with GFP_ATOMIC.

This bug is found by my static analysis tool (DSAC-2) and checked by
my code review.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

The driver may sleep with holding a spinlock.
The function call paths (from bottom to top) in Linux-4.16.7 are:

[FUNC] msleep
drivers/usb/gadget/udc/r8a66597-udc.c, 839:
		msleep in init_controller
drivers/usb/gadget/udc/r8a66597-udc.c, 96:
		init_controller in r8a66597_usb_disconnect
drivers/usb/gadget/udc/r8a66597-udc.c, 93:
		spin_lock in r8a66597_usb_disconnect

[FUNC] msleep
drivers/usb/gadget/udc/r8a66597-udc.c, 835:
		msleep in init_controller
drivers/usb/gadget/udc/r8a66597-udc.c, 96:
		init_controller in r8a66597_usb_disconnect
drivers/usb/gadget/udc/r8a66597-udc.c, 93:
		spin_lock in r8a66597_usb_disconnect

To fix these bugs, msleep() is replaced with mdelay().

This bug is found by my static analysis tool (DSAC-2) and checked by
my code review.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

The current code is broken as it re-defines "req" inside the
if block, then goto out of it. Thus the request that ends
up being sent is not the one that was populated by the
code in question.

This fixes RNDIS driver autodetect by Windows 10 for me.

The bug was introduced by Chris rework to remove the local
queuing inside the if { } block of the redefined request.

Fixes: 636ba13a ("usb: gadget: composite: remove duplicated code in OS desc handling")
Cc: <stable@vger.kernel.org> # v4.17
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

A couple of bugs in the driver are preventing SETUP packets
with an OUT data phase from working properly.

Interestingly those are incredibly rare (RNDIS typically
uses them and thus is broken without this fix).

The main problem was an incorrect register offset being
applied for arming RX on EP0. The other problem relates
to stalling such a packet before the data phase, in which
case we don't get an ACK cycle, and get the next SETUP
packet directly, so we shouldn't reject it.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Merge tag 'phy-for-4.18-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux-phy into usb-linus

Kishon writes:

phy: for 4.18-rc

 *) Fix to get xhci working after disable<->enable cycle
 *) Fix wrong enum used for status lines (also fixes a compilation
    warning).
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

The device (a POS terminal) implements CDC ACM, but has not union
descriptor.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge tag 'usb-ci-v4.18-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb into usb-linus

Peter writes:

One regression fix causes imx51 board hang when using ULPI PHY

Pull ARM SoC fixes from Olof Johansson:

 - A fix for OMAP5 and DRA7 to make the branch predictor hardening
   settings take proper effect on secondary cores

 - Disable USB OTG on am3517 since current driver isn't working

 - Fix thermal sensor register settings on Armada 38x

 - Fix suspend/resume IRQs on pxa3xx

* tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  ARM: dts: am3517.dtsi:  Disable reference to OMAP3 OTG controller
  ARM: DRA7/OMAP5: Enable ACTLR[0] (Enable invalidates of BTB) for secondary cores
  ARM: pxa: irq: fix handling of ICMR registers in suspend/resume
  ARM: dts: armada-38x: use the new thermal binding

Pull RTC fixes from Alexandre Belloni:
 "Two fixes for 4.18:

   - an important core fix for RTCs using the core offsetting only one
     driver is affected

   - a fix for the error path of mrst"

* tag 'rtc-4.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux:
  rtc: fix alarm read and set offset
  rtc: mrst: fix error code in probe()

Merge tag 'omap-for-v4.18/fixes-rc4-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into fixes

Two omap fixes for v4.18-rc cycle

Turns out the recent patches for ARM branch predictor hardening are
not working on omap5 and dra7 as planned because the secondary CPU
is parked to the bootrom code. We can't configure it in the bootloader.
So we must enable invalidates of BTB for omap5 and dra7 secondary
core in the kernel.

And there's a fix for reserved register access for am3517. The
usb otg module on am3517 is not the same as for other omap3.

* tag 'omap-for-v4.18/fixes-rc4-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
  ARM: dts: am3517.dtsi:  Disable reference to OMAP3 OTG controller
  ARM: DRA7/OMAP5: Enable ACTLR[0] (Enable invalidates of BTB) for secondary cores
Signed-off-by: Olof Johansson <olof@lixom.net>

mvebu fixes for 4.18 (part 1)

Use the new thermal binding on Armada 38x allowing to use a driver fix
which is already part of the kernel.

* tag 'mvebu-fixes-4.18-1' of git://git.infradead.org/linux-mvebu:
  ARM: dts: armada-38x: use the new thermal binding
Signed-off-by: Olof Johansson <olof@lixom.net>

This is the fixes set for v4.18 cycle.

This is a fix for suspending all pxa3xx platforms, where high
number interrupts are not reenabled.

* tag 'pxa-fixes-4.18' of https://github.com/rjarzmik/linux:
  ARM: pxa: irq: fix handling of ICMR registers in suspend/resume
Signed-off-by: Olof Johansson <olof@lixom.net>

Pull xen fixes from Juergen Gross:
 "Two related fixes for a boot failure of Xen PV guests"

* tag 'for-linus-4.18-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen: setup pv irq ops vector earlier
  xen: remove global bit from __default_kernel_pte_mask for pv guests

Pull block fix from Jens Axboe:
 "Just a single regression fix (from 4.17) for bsg, fixing an EINVAL
  return on non-data commands"

* tag 'for-linus-20180713' of git://git.kernel.dk/linux-block:
  bsg: fix bogus EINVAL on non-data commands

Merge misc fixes from Andrew Morton:
 "11 fixes"

* emailed patches form Andrew Morton <akpm@linux-foundation.org>:
  reiserfs: fix buffer overflow with long warning messages
  checkpatch: fix duplicate invalid vsprintf pointer extension '%p<foo>' messages
  mm: do not bug_on on incorrect length in __mm_populate()
  mm/memblock.c: do not complain about top-down allocations for !MEMORY_HOTREMOVE
  fs, elf: make sure to page align bss in load_elf_library
  x86/purgatory: add missing FORCE to Makefile target
  net/9p/client.c: put refcount of trans_mod in error case in parse_opts()
  mm: allow arch to supply p??_free_tlb functions
  autofs: fix slab out of bounds read in getname_kernel()
  fs/proc/task_mmu.c: fix Locked field in /proc/pid/smaps*
  mm: do not drop unused pages when userfaultd is running

ReiserFS prepares log messages into a 1024-byte buffer with no bounds
checks.  Long messages, such as the "unknown mount option" warning when
userspace passes a crafted mount options string, overflow this buffer.
This causes KASAN to report a global-out-of-bounds write.

Fix it by truncating messages to the buffer size.

Link: http://lkml.kernel.org/r/20180707203621.30922-1-ebiggers3@gmail.com
Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Reported-by: syzbot+b890b3335a4d8c608963@syzkaller.appspotmail.com
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Multiline statements with invalid %p<foo> uses produce multiple
warnings.  Fix that.

e.g.:

$ cat t_block.c
void foo(void)
{
	MY_DEBUG(drv->foo,
		 "%pk",
		 foo->boo);
}

$ ./scripts/checkpatch.pl -f t_block.c
WARNING: Missing or malformed SPDX-License-Identifier tag in line 1
#1: FILE: t_block.c:1:
+void foo(void)

WARNING: Invalid vsprintf pointer extension '%pk'
#3: FILE: t_block.c:3:
+	MY_DEBUG(drv->foo,
+		 "%pk",
+		 foo->boo);

WARNING: Invalid vsprintf pointer extension '%pk'
#3: FILE: t_block.c:3:
+	MY_DEBUG(drv->foo,
+		 "%pk",
+		 foo->boo);

total: 0 errors, 3 warnings, 6 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

t_block.c has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.

Link: http://lkml.kernel.org/r/9e8341bbe4c9877d159cb512bb701043cbfbb10b.camel@perches.comSigned-off-by: Joe Perches <joe@perches.com>
Cc: "Tobin C. Harding" <me@tobin.cc>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

syzbot has noticed that a specially crafted library can easily hit
VM_BUG_ON in __mm_populate

  kernel BUG at mm/gup.c:1242!
  invalid opcode: 0000 [#1] SMP
  CPU: 2 PID: 9667 Comm: a.out Not tainted 4.18.0-rc3 #644
  Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 05/19/2017
  RIP: 0010:__mm_populate+0x1e2/0x1f0
  Code: 55 d0 65 48 33 14 25 28 00 00 00 89 d8 75 21 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 75 18 f1 ff 0f 0b e8 6e 18 f1 ff <0f> 0b 31 db eb c9 e8 93 06 e0 ff 0f 1f 00 55 48 89 e5 53 48 89 fb
  Call Trace:
     vm_brk_flags+0xc3/0x100
     vm_brk+0x1f/0x30
     load_elf_library+0x281/0x2e0
     __ia32_sys_uselib+0x170/0x1e0
     do_fast_syscall_32+0xca/0x420
     entry_SYSENTER_compat+0x70/0x7f

The reason is that the length of the new brk is not page aligned when we
try to populate the it.  There is no reason to bug on that though.
do_brk_flags already aligns the length properly so the mapping is
expanded as it should.  All we need is to tell mm_populate about it.
Besides that there is absolutely no reason to to bug_on in the first
place.  The worst thing that could happen is that the last page wouldn't
get populated and that is far from putting system into an inconsistent
state.

Fix the issue by moving the length sanitization code from do_brk_flags
up to vm_brk_flags.  The only other caller of do_brk_flags is brk
syscall entry and it makes sure to provide the proper length so t here
is no need for sanitation and so we can use do_brk_flags without it.

Also remove the bogus BUG_ONs.

[osalvador@techadventures.net: fix up vm_brk_flags s@request@len@]
Link: http://lkml.kernel.org/r/20180706090217.GI32658@dhcp22.suse.czSigned-off-by: Michal Hocko <mhocko@suse.com>
Reported-by: syzbot <syzbot+5dcb560fe12aa5091c06@syzkaller.appspotmail.com>
Tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Zi Yan <zi.yan@cs.rutgers.edu>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Mike Rapoport is converting architectures from bootmem to nobootmem
allocator.  While doing so for m68k Geert has noticed that he gets a
scary looking warning:

  WARNING: CPU: 0 PID: 0 at mm/memblock.c:230
  memblock_find_in_range_node+0x11c/0x1be
  memblock: bottom-up allocation failed, memory hotunplug may be affected
  Modules linked in:
  CPU: 0 PID: 0 Comm: swapper Not tainted
  4.18.0-rc3-atari-01343-gf2fb5f2e09a97a3c-dirty #7
  Call Trace: __warn+0xa8/0xc2
    kernel_pg_dir+0x0/0x1000
    netdev_lower_get_next+0x2/0x22
    warn_slowpath_fmt+0x2e/0x36
    memblock_find_in_range_node+0x11c/0x1be
    memblock_find_in_range_node+0x11c/0x1be
    memblock_find_in_range_node+0x0/0x1be
    vprintk_func+0x66/0x6e
    memblock_virt_alloc_internal+0xd0/0x156
    netdev_lower_get_next+0x2/0x22
    netdev_lower_get_next+0x2/0x22
    kernel_pg_dir+0x0/0x1000
    memblock_virt_alloc_try_nid_nopanic+0x58/0x7a
    netdev_lower_get_next+0x2/0x22
    kernel_pg_dir+0x0/0x1000
    kernel_pg_dir+0x0/0x1000
    EXPTBL+0x234/0x400
    EXPTBL+0x234/0x400
    alloc_node_mem_map+0x4a/0x66
    netdev_lower_get_next+0x2/0x22
    free_area_init_node+0xe2/0x29e
    EXPTBL+0x234/0x400
    paging_init+0x430/0x462
    kernel_pg_dir+0x0/0x1000
    printk+0x0/0x1a
    EXPTBL+0x234/0x400
    setup_arch+0x1b8/0x22c
    start_kernel+0x4a/0x40a
    _sinittext+0x344/0x9e8

The warning is basically saying that a top-down allocation can break
memory hotremove because memblock allocation is not movable.  But m68k
doesn't even support MEMORY_HOTREMOVE so there is no point to warn about
it.

Make the warning conditional only to configurations that care.

Link: http://lkml.kernel.org/r/20180706061750.GH32658@dhcp22.suse.czSigned-off-by: Michal Hocko <mhocko@suse.com>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Sam Creasey <sammy@sammy.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The current code does not make sure to page align bss before calling
vm_brk(), and this can lead to a VM_BUG_ON() in __mm_populate() due to
the requested lenght not being correctly aligned.

Let us make sure to align it properly.

Kees: only applicable to CONFIG_USELIB kernels: 32-bit and configured
for libc5.

Link: http://lkml.kernel.org/r/20180705145539.9627-1-osalvador@techadventures.netSigned-off-by: Oscar Salvador <osalvador@suse.de>
Reported-by: syzbot+5dcb560fe12aa5091c06@syzkaller.appspotmail.com
Tested-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

- Build the kernel without the fix
- Add some flag to the purgatories KBUILD_CFLAGS,I used
  -fno-asynchronous-unwind-tables
- Re-build the kernel

When you look at makes output you see that sha256.o is not re-build in the
last step.  Also readelf -S still shows the .eh_frame section for
sha256.o.

With the fix sha256.o is rebuilt in the last step.

Without FORCE make does not detect changes only made to the command line
options.  So object files might not be re-built even when they should be.
Fix this by adding FORCE where it is missing.

Link: http://lkml.kernel.org/r/20180704110044.29279-2-prudo@linux.ibm.com
Fixes: df6f2801 ("kernel/kexec_file.c: move purgatories sha256 to common code")
Signed-off-by: Philipp Rudo <prudo@linux.ibm.com>
Acked-by: Dave Young <dyoung@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@vger.kernel.org>	[4.17+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

In my testing, the second mount will fail after umounting successfully.
The reason is that we put refcount of trans_mod in the correct case
rather than the error case in parse_opts() at last.  That will cause the
refcount decrease to -1, and when we try to get trans_mod again in
try_module_get(), we could only increase refcount to 0 which will cause
failure as follows:

parse_opts
  v9fs_get_trans_by_name
    try_module_get : return NULL to caller which cause error

So we should put refcount of trans_mod in error case.

Link: http://lkml.kernel.org/r/5B3F39A0.2030509@huawei.com
Fixes: 9421c3e6 ("net/9p/client.c: fix potential refcnt problem of trans module")
Signed-off-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Yiwen Jiang <jiangyiwen@huawei.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Dominique Martinet <dominique.martinet@cea.fr>
Tested-by: Dominique Martinet <dominique.martinet@cea.fr>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The mmu_gather APIs keep track of the invalidated address range
including the span covered by invalidated page table pages.  Ranges
covered by page tables but not ptes (and therefore no TLBs) still need
to be invalidated because some architectures (x86) can cache
intermediate page table entries, and invalidate those with normal TLB
invalidation instructions to be almost-backward-compatible.

Architectures which don't cache intermediate page table entries, or
which invalidate these caches separately from TLB invalidation, do not
require TLB invalidation range expanded over page tables.

Allow architectures to supply their own p??_free_tlb functions, which
can avoid the __tlb_adjust_range.

Link: http://lkml.kernel.org/r/20180703013131.2807-1-npiggin@gmail.comSigned-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: "Aneesh Kumar K. V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>