- 13 Apr, 2015 19 commits
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Darshana Padmadas authored
commit 4ce7ca89 upstream. This patch uses iio_trigger_get to increment the reference count of trigger device, to avoid incorrect assignment. Can result in a null pointer dereference during removal if the trigger has been changed before removal. This patch refers to a similar situation encountered through the following discussion: http://www.spinics.net/lists/linux-iio/msg13669.htmlSigned-off-by:
Darshana Padmadas <darshanapadmadas@gmail.com> Signed-off-by:
Jonathan Cameron <jic23@kernel.org> Signed-off-by:
Luis Henriques <luis.henriques@canonical.com>
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Stefan Agner authored
commit f54e9f2b upstream. Depending on conversion mode used, the ADC clock (ADCK) needs to be below a maximum frequency. According to Vybrid's data sheet this is 20MHz for the low power conversion mode. The ADC clock is depending on input clock, which is the bus clock by default. Vybrid SoC are typically clocked at at 400MHz or 500MHz, which leads to 66MHz or 83MHz bus clock respectively. Hence, a divider of 8 is required to stay below the specified maximum clock of 20MHz. Due to the different bus clock speeds, the resulting sampling frequency is not static. Hence use the ADC clock and calculate the actual available sampling frequency dynamically. This fixes bogous values observed on some 500MHz clocked Vybrid SoC. The resulting value usually showed Bit 9 being stuck at 1, or 0, which lead to a value of +/-512. Signed-off-by:
Stefan Agner <stefan@agner.ch> Acked-by:
Fugang Duan <B38611@freescale.com> Signed-off-by:
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David Miller authored
commit f2c9e560 upstream. Use readb() and memcpy_fromio() accessors instead. Reviewed-by:
Christian König <christian.koenig@amd.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
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Alex Deucher authored
commit 3899ca84 upstream. Need to expand the check to handle short circuiting if the selected state is the same as current state. bug: https://bugs.freedesktop.org/show_bug.cgi?id=87796Signed-off-by:
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Stefan Agner authored
commit 8e4934c6 upstream. When the receiver was enabled during startup, a character could have been in the FIFO when the UART get initially used. The driver configures the (receive) watermark level, and flushes the FIFO. However, the receive flag (RDRF) could still be set at that stage (as mentioned in the register description of UARTx_RWFIFO). This leads to an interrupt which won't be handled properly in interrupt mode: The receive interrupt function lpuart_rxint checks the FIFO count, which is 0 at that point (due to the flush during initialization). The problem does not manifest when using DMA to receive characters. Fix this situation by explicitly read the status register, which leads to clearing of the RDRF flag. Due to the flush just after the status flag read, a explicit data read is not to required. Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
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Doug Goldstein authored
commit b229a0f8 upstream. This patch uses the existing CALAO Systems ftdi_8u2232c_probe in order to avoid attaching a TTY to the JTAG port as this board is based on the CALAO Systems reference design and needs the same fix up. Signed-off-by:
Doug Goldstein <cardoe@cardoe.com> [johan: clean up probe logic ] Signed-off-by:
Johan Hovold <johan@kernel.org> Signed-off-by:
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Lu Baolu authored
commit 227a4fd8 upstream. When a device with an isochronous endpoint is plugged into the Intel xHCI host controller, and the driver submits multiple frames per URB, the xHCI driver will set the Block Event Interrupt (BEI) flag on all but the last TD for the URB. This causes the host controller to place an event on the event ring, but not send an interrupt. When the last TD for the URB completes, BEI is cleared, and we get an interrupt for the whole URB. However, under Intel xHCI host controllers, if the event ring is full of events from transfers with BEI set, an "Event Ring is Full" event will be posted to the last entry of the event ring, but no interrupt is generated. Host will cease all transfer and command executions and wait until software completes handling the pending events in the event ring. That means xHC stops, but event of "event ring is full" is not notified. As the result, the xHC looks like dead to user. This patch is to apply XHCI_AVOID_BEI quirk to Intel xHC devices. And it should be backported to kernels as old as 3.0, that contains the commit 69e848c2 ("Intel xhci: Support EHCI/xHCI port switching."). Signed-off-by:
Lu Baolu <baolu.lu@linux.intel.com> Tested-by:
Alistair Grant <akgrant0710@gmail.com> Signed-off-by:
Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by:
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Lu Baolu authored
commit 9425183d upstream. Linux xHCI driver doesn't report and handle port cofig error change. If Port Configure Error for root hub port occurs, CEC bit in PORTSC would be set by xHC and remains 1. This happends when the root port fails to configure its link partner, e.g. the port fails to exchange port capabilities information using Port Capability LMPs. Then the Port Status Change Events will be blocked until all status change bits(CEC is one of the change bits) are cleared('0') (refer to xHCI spec 4.19.2). Otherwise, the port status change event for this root port will not be generated anymore, then root port would look like dead for user and can't be recovered until a Host Controller Reset(HCRST). This patch is to check CEC bit in PORTSC in xhci_get_port_status() and set a Config Error in the return status if CEC is set. This will cause a ClearPortFeature request, where CEC bit is cleared in xhci_clear_port_change_bit(). [The commit log is based on initial Marvell patch posted at http://marc.info/?l=linux-kernel&m=142323612321434&w=2] Reported-by:
Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by:
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Juergen Gross authored
commit 3c56b3a1 upstream. Commit 25b884a8 ("x86/xen: set regions above the end of RAM as 1:1") introduced a regression. To be able to add memory pages which were added via memory hotplug to a pv domain, the pages must be "invalid" instead of "identity" in the p2m list before they can be added. Suggested-by:
David Vrabel <david.vrabel@citrix.com> Signed-off-by:
Juergen Gross <jgross@suse.com> Reviewed-by:
Daniel Kiper <daniel.kiper@oracle.com> Signed-off-by:
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Andreas Werner authored
commit 555828ef upstream. Return EPROBE_DEFER if Regulator returns EPROBE_DEFER If the Flexcan driver is built into kernel and a regulator is used to enable the CAN transceiver, the Flexcan driver may not use the regulator. When initializing the Flexcan device with a regulator defined in the device tree, but not initialized, the regulator subsystem returns EPROBE_DEFER, hence the Flexcan init fails. The solution for this is to return EPROBE_DEFER if regulator is not initialized and wait until the regulator is initialized. Signed-off-by:
Andreas Werner <kernel@andy89.org> Signed-off-by:
Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by:
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David Disseldorp authored
commit e1e9bda2 upstream. Under intermittent network outages, find_writable_file() is susceptible to the following race condition, which results in a user-after-free in the cifs_writepages code-path: Thread 1 Thread 2 ======== ======== inv_file = NULL refind = 0 spin_lock(&cifs_file_list_lock) // invalidHandle found on openFileList inv_file = open_file // inv_file->count currently 1 cifsFileInfo_get(inv_file) // inv_file->count = 2 spin_unlock(&cifs_file_list_lock); cifs_reopen_file() cifs_close() // fails (rc != 0) ->cifsFileInfo_put() spin_lock(&cifs_file_list_lock) // inv_file->count = 1 spin_unlock(&cifs_file_list_lock) spin_lock(&cifs_file_list_lock); list_move_tail(&inv_file->flist, &cifs_inode->openFileList); spin_unlock(&cifs_file_list_lock); cifsFileInfo_put(inv_file); ->spin_lock(&cifs_file_list_lock) // inv_file->count = 0 list_del(&cifs_file->flist); // cleanup!! kfree(cifs_file); spin_unlock(&cifs_file_list_lock); spin_lock(&cifs_file_list_lock); ++refind; // refind = 1 goto refind_writable; At this point we loop back through with an invalid inv_file pointer and a refind value of 1. On second pass, inv_file is not overwritten on openFileList traversal, and is subsequently dereferenced. Signed-off-by:
David Disseldorp <ddiss@suse.de> Reviewed-by:
Jeff Layton <jlayton@samba.org> Signed-off-by:
Steve French <smfrench@gmail.com> Signed-off-by:
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Sachin Prabhu authored
commit 2477bc58 upstream. While attempting to clone a file on a samba server, we receive a STATUS_INVALID_DEVICE_REQUEST. This is mapped to -EOPNOTSUPP which isn't handled in smb2_clone_range(). We end up looping in the while loop making same call to the samba server over and over again. The proposed fix is to exit and return the error value when encountered with an unhandled error. Signed-off-by:
Sachin Prabhu <sprabhu@redhat.com> Signed-off-by:
Steve French <steve.french@primarydata.com> Signed-off-by:
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Nathaniel W Filardo authored
commit 5e71fc86 upstream. Add USB VID/PID for Xircom PGMFHUB USB/serial component. (The hub and SCSI bridge on that hardware are recognized out of the box by existing drivers.) Tested VID/PID using new_id and loopback connection and was met with success, but that's all the testing done. Signed-off-by:
Nathaniel Wesley Filardo <nwf@cs.jhu.edu> Signed-off-by:
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Mark Knibbs authored
commit 5f9f975b upstream. Entrega is misspelled as Entregra or Entrgra, so fix that. Signed-off-by:
Mark Knibbs <markk@clara.co.uk> Signed-off-by:
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Emmanuel Grumbach authored
commit 9c8928f5 upstream. The assumption before this patch was that we don't need to run again the INIT firmware after the system booted. The INIT firmware runs calibrations which impact the physical layer's behavior. Users reported that it may be helpful to run these calibrations again every time the interface is brought up. The penatly is minimal, since the calibrations run fast. This fixes: https://bugzilla.kernel.org/show_bug.cgi?id=94341Signed-off-by:
Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by:
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Doug Goldstein authored
commit 4899c054 upstream. Synapse Wireless uses the FTDI VID with a custom PID of 0x9090 for their SNAP Stick 200 product. Signed-off-by:
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Martin Fuzzey authored
commit c1b03ab5 upstream. When an error occurred during event registration memory was freed twice resulting in kernel memory corruption and a crash in unrelated code. The problem was caused by iio_device_unregister_eventset() iio_device_unregister_sysfs() being called twice, once on the error path and then again via iio_dev_release(). Fix this by making these two functions idempotent so they may be called multiple times. The problem was observed before applying 78b33216 iio:core: Handle error when mask type is not separate Signed-off-by:
Martin Fuzzey <mfuzzey@parkeon.com> Signed-off-by:
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Viorel Suman authored
commit 4dac0a8e upstream. A hardware fifo reset always imply an invalidation of the existing timestamps, so we'll clear timestamps fifo on successfull hardware fifo reset. Signed-off-by:
Viorel Suman <viorel.suman@gmail.com> Signed-off-by:
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Octavian Purdila authored
commit 70dddeee upstream. If the in-kernel push interface is used we may have a different masks on the device buffer and the kernel buffer and in this case the device should generate data for the reunion of the buffers, which is available at indio_dev->active_scan_mask. Compiled tested only except for bmc150-accel which was tested at runtime with the hardware. Signed-off-by:
Octavian Purdila <octavian.purdila@intel.com> Signed-off-by:
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- 10 Apr, 2015 21 commits
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D.S. Ljungmark authored
commit 6fd99094 upstream. A local route may have a lower hop_limit set than global routes do. RFC 3756, Section 4.2.7, "Parameter Spoofing" > 1. The attacker includes a Current Hop Limit of one or another small > number which the attacker knows will cause legitimate packets to > be dropped before they reach their destination. > As an example, one possible approach to mitigate this threat is to > ignore very small hop limits. The nodes could implement a > configurable minimum hop limit, and ignore attempts to set it below > said limit. Signed-off-by:
D.S. Ljungmark <ljungmark@modio.se> Acked-by:
Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by:
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Tejun Heo authored
commit c72efb65 upstream. From 1ebf33901ecc75d9496862dceb1ef0377980587c Mon Sep 17 00:00:00 2001 From: Tejun Heo <tj@kernel.org> Date: Mon, 23 Mar 2015 00:08:19 -0400 2f800fbd ("writeback: fix dirtied pages accounting on redirty") introduced account_page_redirty() which reverts stat updates for a redirtied page, making BDI_DIRTIED no longer monotonically increasing. bdi_update_write_bandwidth() uses the delta in BDI_DIRTIED as the basis for bandwidth calculation. While unlikely, since the above patch, the newer value may be lower than the recorded past value and nunderflow the bandwidth calculation leading to a wild result. Fix it by subtracing min of the old and new values when calculating delta. AFAIK, there hasn't been any report of it happening but the resulting erratic behavior would be non-critical and temporary, so it's possible that the issue is happening without being reported. The risk of the fix is very low, so tagged for -stable. Signed-off-by:
Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jan Kara <jack@suse.cz> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Greg Thelen <gthelen@google.com> Fixes: 2f800fbd ("writeback: fix dirtied pages accounting on redirty") Signed-off-by:
Jens Axboe <axboe@fb.com> Signed-off-by:
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Vineet Gupta authored
commit 6914e1e3 upstream. The regfile provided to SA_SIGINFO signal handler as ucontext was off by one due to pt_regs gutter cleanups in 2013. Before handling signal, user pt_regs are copied onto user_regs_struct and copied back later. Both structs are binary compatible. This was all fine until commit 2fa91904 (ARC: pt_regs update #2) which removed the empty stack slot at top of pt_regs (corresponding to first pad) and made the corresponding fixup in struct user_regs_struct (the pad in there was moved out of @scratch - not removed altogether as it is part of ptrace ABI) struct user_regs_struct { + long pad; struct { - long pad; long bta, lp_start, lp_end,.... } scratch; ... } This meant that now user_regs_struct was off by 1 reg w.r.t pt_regs and signal code needs to user_regs_struct.scratch to reflect it as pt_regs, which is what this commit does. This problem was hidden for 2 years, because both save/restore, despite using wrong location, were using the same location. Only an interim inspection (reproducer below) exposed the issue. void handle_segv(int signo, siginfo_t *info, void *context) { ucontext_t *uc = context; struct user_regs_struct *regs = &(uc->uc_mcontext.regs); printf("regs %x %x\n", <=== prints 7 8 (vs. 8 9) regs->scratch.r8, regs->scratch.r9); } int main() { struct sigaction sa; sa.sa_sigaction = handle_segv; sa.sa_flags = SA_SIGINFO; sigemptyset(&sa.sa_mask); sigaction(SIGSEGV, &sa, NULL); asm volatile( "mov r7, 7 \n" "mov r8, 8 \n" "mov r9, 9 \n" "mov r10, 10 \n" :::"r7","r8","r9","r10"); *((unsigned int*)0x10) = 0; } Fixes: 2fa91904 "ARC: pt_regs update #2: Remove unused gutter at start of pt_regs" Signed-off-by:
Vineet Gupta <vgupta@synopsys.com> Signed-off-by:
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Sergei Antonov authored
commit 98cf21c6 upstream. Fix B-tree corruption when a new record is inserted at position 0 in the node in hfs_brec_insert(). In this case a hfs_brec_update_parent() is called to update the parent index node (if exists) and it is passed hfs_find_data with a search_key containing a newly inserted key instead of the key to be updated. This results in an inconsistent index node. The bug reproduces on my machine after an extents overflow record for the catalog file (CNID=4) is inserted into the extents overflow B-tree. Because of a low (reserved) value of CNID=4, it has to become the first record in the first leaf node. The resulting first leaf node is correct: ---------------------------------------------------- | key0.CNID=4 | key1.CNID=123 | key2.CNID=456, ... | ---------------------------------------------------- But the parent index key0 still contains the previous key CNID=123: ----------------------- | key0.CNID=123 | ... | ----------------------- A change in hfs_brec_insert() makes hfs_brec_update_parent() work correctly by preventing it from getting fd->record=-1 value from __hfs_brec_find(). Along the way, I removed duplicate code with unification of the if condition. The resulting code is equivalent to the original code because node is never 0. Also hfs_brec_update_parent() will now return an error after getting a negative fd->record value. However, the return value of hfs_brec_update_parent() is not checked anywhere in the file and I'm leaving it unchanged by this patch. brec.c lacks error checking after some other calls too, but this issue is of less importance than the one being fixed by this patch. Signed-off-by:
Sergei Antonov <saproj@gmail.com> Cc: Joe Perches <joe@perches.com> Reviewed-by:
Vyacheslav Dubeyko <slava@dubeyko.com> Acked-by:
Hin-Tak Leung <htl10@users.sourceforge.net> Cc: Anton Altaparmakov <aia21@cam.ac.uk> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Gu Zheng authored
commit b0dc3a34 upstream. Qiu Xishi reported the following BUG when testing hot-add/hot-remove node under stress condition: BUG: unable to handle kernel paging request at 0000000000025f60 IP: next_online_pgdat+0x1/0x50 PGD 0 Oops: 0000 [#1] SMP ACPI: Device does not support D3cold Modules linked in: fuse nls_iso8859_1 nls_cp437 vfat fat loop dm_mod coretemp mperf crc32c_intel ghash_clmulni_intel aesni_intel ablk_helper cryptd lrw gf128mul glue_helper aes_x86_64 pcspkr microcode igb dca i2c_algo_bit ipv6 megaraid_sas iTCO_wdt i2c_i801 i2c_core iTCO_vendor_support tg3 sg hwmon ptp lpc_ich pps_core mfd_core acpi_pad rtc_cmos button ext3 jbd mbcache sd_mod crc_t10dif scsi_dh_alua scsi_dh_rdac scsi_dh_hp_sw scsi_dh_emc scsi_dh ahci libahci libata scsi_mod [last unloaded: rasf] CPU: 23 PID: 238 Comm: kworker/23:1 Tainted: G O 3.10.15-5885-euler0302 #1 Hardware name: HUAWEI TECHNOLOGIES CO.,LTD. Huawei N1/Huawei N1, BIOS V100R001 03/02/2015 Workqueue: events vmstat_update task: ffffa800d32c0000 ti: ffffa800d32ae000 task.ti: ffffa800d32ae000 RIP: 0010: next_online_pgdat+0x1/0x50 RSP: 0018:ffffa800d32afce8 EFLAGS: 00010286 RAX: 0000000000001440 RBX: ffffffff81da53b8 RCX: 0000000000000082 RDX: 0000000000000000 RSI: 0000000000000082 RDI: 0000000000000000 RBP: ffffa800d32afd28 R08: ffffffff81c93bfc R09: ffffffff81cbdc96 R10: 00000000000040ec R11: 00000000000000a0 R12: ffffa800fffb3440 R13: ffffa800d32afd38 R14: 0000000000000017 R15: ffffa800e6616800 FS: 0000000000000000(0000) GS:ffffa800e6600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000025f60 CR3: 0000000001a0b000 CR4: 00000000001407e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: refresh_cpu_vm_stats+0xd0/0x140 vmstat_update+0x11/0x50 process_one_work+0x194/0x3d0 worker_thread+0x12b/0x410 kthread+0xc6/0xd0 ret_from_fork+0x7c/0xb0 The cause is the "memset(pgdat, 0, sizeof(*pgdat))" at the end of try_offline_node, which will reset all the content of pgdat to 0, as the pgdat is accessed lock-free, so that the users still using the pgdat will panic, such as the vmstat_update routine. process A: offline node XX: vmstat_updat() refresh_cpu_vm_stats() for_each_populated_zone() find online node XX cond_resched() offline cpu and memory, then try_offline_node() node_set_offline(nid), and memset(pgdat, 0, sizeof(*pgdat)) zone = next_zone(zone) pg_data_t *pgdat = zone->zone_pgdat; // here pgdat is NULL now next_online_pgdat(pgdat) next_online_node(pgdat->node_id); // NULL pointer access So the solution here is postponing the reset of obsolete pgdat from try_offline_node() to hotadd_new_pgdat(), and just resetting pgdat->nr_zones and pgdat->classzone_idx to be 0 rather than the memset 0 to avoid breaking pointer information in pgdat. Signed-off-by:
Gu Zheng <guz.fnst@cn.fujitsu.com> Reported-by:
Xishi Qiu <qiuxishi@huawei.com> Suggested-by:
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Taku Izumi <izumi.taku@jp.fujitsu.com> Cc: Tang Chen <tangchen@cn.fujitsu.com> Cc: Xie XiuQi <xiexiuqi@huawei.com> Signed-off-by:
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Leon Yu authored
commit 3fe89b3e upstream. I have constantly stumbled upon "kernel BUG at mm/rmap.c:399!" after upgrading to 3.19 and had no luck with 4.0-rc1 neither. So, after looking into new logic introduced by commit 7a3ef208 ("mm: prevent endless growth of anon_vma hierarchy"), I found chances are that unlink_anon_vmas() is called without incrementing dst->anon_vma->degree in anon_vma_clone() due to allocation failure. If dst->anon_vma is not NULL in error path, its degree will be incorrectly decremented in unlink_anon_vmas() and eventually underflow when exiting as a result of another call to unlink_anon_vmas(). That's how "kernel BUG at mm/rmap.c:399!" is triggered for me. This patch fixes the underflow by dropping dst->anon_vma when allocation fails. It's safe to do so regardless of original value of dst->anon_vma because dst->anon_vma doesn't have valid meaning if anon_vma_clone() fails. Besides, callers don't care dst->anon_vma in such case neither. Also suggested by Michal Hocko, we can clean up vma_adjust() a bit as anon_vma_clone() now does the work. [akpm@linux-foundation.org: tweak comment] Fixes: 7a3ef208 ("mm: prevent endless growth of anon_vma hierarchy") Signed-off-by:
Leon Yu <chianglungyu@gmail.com> Signed-off-by:
Konstantin Khlebnikov <koct9i@gmail.com> Reviewed-by:
Michal Hocko <mhocko@suse.cz> Acked-by:
Rik van Riel <riel@redhat.com> Acked-by:
David Rientjes <rientjes@google.com> Signed-off-by:
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Joe Perches authored
commit 6436a123 upstream. Return a negative error value like the rest of the entries in this function. Signed-off-by:
Joe Perches <joe@perches.com> Acked-by:
Stephen Smalley <sds@tycho.nsa.gov> [PM: tweaked subject line] Signed-off-by:
Paul Moore <pmoore@redhat.com> Signed-off-by:
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Catalin Marinas authored
commit e53f21bc upstream. The idle_task_exit() function may call switch_mm() with next == &init_mm. On arm64, init_mm.pgd cannot be used for user mappings, so this patch simply sets the reserved TTBR0. Reported-by:
Jon Medhurst (Tixy) <tixy@linaro.org> Tested-by:
Catalin Marinas <catalin.marinas@arm.com> Signed-off-by:
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Sebastian Wicki authored
commit 80b311d3 upstream. This model uses the same dock port as the previous generation. Signed-off-by:
Sebastian Wicki <gandro@gmx.net> Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
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Brian Silverman authored
commit 746db944 upstream. When non-realtime tasks get priority-inheritance boosted to a realtime scheduling class, RLIMIT_RTTIME starts to apply to them. However, the counter used for checking this (the same one used for SCHED_RR timeslices) was not getting reset. This meant that tasks running with a non-realtime scheduling class which are repeatedly boosted to a realtime one, but never block while they are running realtime, eventually hit the timeout without ever running for a time over the limit. This patch resets the realtime timeslice counter when un-PI-boosting from an RT to a non-RT scheduling class. I have some test code with two threads and a shared PTHREAD_PRIO_INHERIT mutex which induces priority boosting and spins while boosted that gets killed by a SIGXCPU on non-fixed kernels but doesn't with this patch applied. It happens much faster with a CONFIG_PREEMPT_RT kernel, and does happen eventually with PREEMPT_VOLUNTARY kernels. Signed-off-by:
Brian Silverman <brian@peloton-tech.com> Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Cc: austin@peloton-tech.com Link: http://lkml.kernel.org/r/1424305436-6716-1-git-send-email-brian@peloton-tech.comSigned-off-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
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Peter Zijlstra authored
commit d525211f upstream. Vince reported a watchdog lockup like: [<ffffffff8115e114>] perf_tp_event+0xc4/0x210 [<ffffffff810b4f8a>] perf_trace_lock+0x12a/0x160 [<ffffffff810b7f10>] lock_release+0x130/0x260 [<ffffffff816c7474>] _raw_spin_unlock_irqrestore+0x24/0x40 [<ffffffff8107bb4d>] do_send_sig_info+0x5d/0x80 [<ffffffff811f69df>] send_sigio_to_task+0x12f/0x1a0 [<ffffffff811f71ce>] send_sigio+0xae/0x100 [<ffffffff811f72b7>] kill_fasync+0x97/0xf0 [<ffffffff8115d0b4>] perf_event_wakeup+0xd4/0xf0 [<ffffffff8115d103>] perf_pending_event+0x33/0x60 [<ffffffff8114e3fc>] irq_work_run_list+0x4c/0x80 [<ffffffff8114e448>] irq_work_run+0x18/0x40 [<ffffffff810196af>] smp_trace_irq_work_interrupt+0x3f/0xc0 [<ffffffff816c99bd>] trace_irq_work_interrupt+0x6d/0x80 Which is caused by an irq_work generating new irq_work and therefore not allowing forward progress. This happens because processing the perf irq_work triggers another perf event (tracepoint stuff) which in turn generates an irq_work ad infinitum. Avoid this by raising the recursion counter in the irq_work -- which effectively disables all software events (including tracepoints) from actually triggering again. Reported-by:
Vince Weaver <vincent.weaver@maine.edu> Tested-by:
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Mahesh Salgaonkar authored
commit 44d5f6f5 upstream. commit id 2ba9f0d8 has changed CONFIG_KVM_BOOK3S_64_HV to tristate to allow HV/PR bits to be built as modules. But the MCE code still depends on CONFIG_KVM_BOOK3S_64_HV which is wrong. When user selects CONFIG_KVM_BOOK3S_64_HV=m to build HV/PR bits as a separate module the relevant MCE code gets excluded. This patch fixes the MCE code to use CONFIG_KVM_BOOK3S_64_HANDLER. This makes sure that the relevant MCE code is included when HV/PR bits are built as a separate modules. Fixes: 2ba9f0d8 ("kvm: powerpc: book3s: Support building HV and PR KVM as module") Signed-off-by:
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Acked-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
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Markos Chandras authored
commit 87f966d9 upstream. On a MIPS Malta board, tons of fifo underflow errors have been observed when using u-boot as bootloader instead of YAMON. The reason for that is that YAMON used to set the pcnet device to SRAM mode but u-boot does not. As a result, the default Tx threshold (64 bytes) is now too small to keep the fifo relatively used and it can result to Tx fifo underflow errors. As a result of which, it's best to setup the SRAM on supported controllers so we can always use the NOUFLO bit. Cc: <netdev@vger.kernel.org> Cc: <linux-kernel@vger.kernel.org> Cc: Don Fry <pcnet32@frontier.com> Signed-off-by:
Markos Chandras <markos.chandras@imgtec.com> Signed-off-by:
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Wenbo Wang authored
commit 7ee8e4f3 upstream. Use the right array index to reference the last element of rq->biotail->bi_io_vec[] Signed-off-by:
Wenbo Wang <wenbo.wang@memblaze.com> Reviewed-by:
Chong Yuan <chong.yuan@memblaze.com> Fixes: 66cb45aa ("block: add support for limiting gaps in SG lists") Signed-off-by:
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Tyrel Datwyler authored
commit f6ff0414 upstream. We currently use the device tree update code in the kernel after resuming from a suspend operation to re-sync the kernels view of the device tree with that of the hypervisor. The code as it stands is not endian safe as it relies on parsing buffers returned by RTAS calls that thusly contains data in big endian format. This patch annotates variables and structure members with __be types as well as performing necessary byte swaps to cpu endian for data that needs to be parsed. Signed-off-by:
Tyrel Datwyler <tyreld@linux.vnet.ibm.com> Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com> Cc: Cyril Bur <cyrilbur@gmail.com> Signed-off-by:
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Philipp Zabel authored
commit c6b570d9 upstream. This patch fixes a NULL pointer dereference when enabling regmap event tracing in the presence of a syscon regmap, introduced by commit bdb0066d ("mfd: syscon: Decouple syscon interface from platform devices"). That patch introduced syscon regmaps that have their dev field set to NULL. The regmap trace events expect it to point to a valid struct device and feed it to dev_name(): $ echo 1 > /sys/kernel/debug/tracing/events/regmap/enable Unable to handle kernel NULL pointer dereference at virtual address 0000002c pgd = 80004000 [0000002c] *pgd=00000000 Internal error: Oops: 17 [#1] SMP ARM Modules linked in: coda videobuf2_vmalloc CPU: 0 PID: 304 Comm: kworker/0:2 Not tainted 4.0.0-rc2+ #9197 Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) Workqueue: events_freezable thermal_zone_device_check task: 9f25a200 ti: 9f1ee000 task.ti: 9f1ee000 PC is at ftrace_raw_event_regmap_block+0x3c/0xe4 LR is at _regmap_raw_read+0x1bc/0x1cc pc : [<803636e8>] lr : [<80365f2c>] psr: 600f0093 sp : 9f1efd78 ip : 9f1efdb8 fp : 9f1efdb4 r10: 00000004 r9 : 00000001 r8 : 00000001 r7 : 00000180 r6 : 00000000 r5 : 9f00e3c0 r4 : 00000003 r3 : 00000001 r2 : 00000180 r1 : 00000000 r0 : 9f00e3c0 Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel Control: 10c5387d Table: 2d91004a DAC: 00000015 Process kworker/0:2 (pid: 304, stack limit = 0x9f1ee210) Stack: (0x9f1efd78 to 0x9f1f0000) fd60: 9f1efda4 9f1efd88 fd80: 800708c0 805f9510 80927140 800f0013 9f1fc800 9eb2f490 00000000 00000180 fda0: 808e3840 00000001 9f1efdfc 9f1efdb8 80365f2c 803636b8 805f8958 800708e0 fdc0: a00f0013 803636ac 9f16de00 00000180 80927140 9f1fc800 9f1fc800 9f1efe6c fde0: 9f1efe6c 9f732400 00000000 00000000 9f1efe1c 9f1efe00 80365f70 80365d7c fe00: 80365f3c 9f1fc800 9f1fc800 00000180 9f1efe44 9f1efe20 803656a4 80365f48 fe20: 9f1fc800 00000180 9f1efe6c 9f1efe6c 9f732400 00000000 9f1efe64 9f1efe48 fe40: 803657bc 80365634 00000001 9e95f910 9f1fc800 9f1efeb4 9f1efe8c 9f1efe68 fe60: 80452ac0 80365778 9f1efe8c 9f1efe78 9e93d400 9e93d5e8 9f1efeb4 9f72ef40 fe80: 9f1efeac 9f1efe90 8044e11c 80452998 8045298c 9e93d608 9e93d400 808e1978 fea0: 9f1efecc 9f1efeb0 8044fd14 8044e0d0 ffffffff 9f25a200 9e93d608 9e481380 fec0: 9f1efedc 9f1efed0 8044fde8 8044fcec 9f1eff1c 9f1efee0 80038d50 8044fdd8 fee0: 9f1ee020 9f72ef40 9e481398 00000000 00000008 9f72ef54 9f1ee020 9f72ef40 ff00: 9e481398 9e481380 00000008 9f72ef40 9f1eff5c 9f1eff20 80039754 80038bfc ff20: 00000000 9e481380 80894100 808e1662 00000000 9e4f2ec0 00000000 9e481380 ff40: 800396f8 00000000 00000000 00000000 9f1effac 9f1eff60 8003e020 80039704 ff60: ffffffff 00000000 ffffffff 9e481380 00000000 00000000 9f1eff78 9f1eff78 ff80: 00000000 00000000 9f1eff88 9f1eff88 9e4f2ec0 8003df30 00000000 00000000 ffa0: 00000000 9f1effb0 8000eb60 8003df3c 00000000 00000000 00000000 00000000 ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 ffffffff ffffffff Backtrace: [<803636ac>] (ftrace_raw_event_regmap_block) from [<80365f2c>] (_regmap_raw_read+0x1bc/0x1cc) r9:00000001 r8:808e3840 r7:00000180 r6:00000000 r5:9eb2f490 r4:9f1fc800 [<80365d70>] (_regmap_raw_read) from [<80365f70>] (_regmap_bus_read+0x34/0x6c) r10:00000000 r9:00000000 r8:9f732400 r7:9f1efe6c r6:9f1efe6c r5:9f1fc800 r4:9f1fc800 [<80365f3c>] (_regmap_bus_read) from [<803656a4>] (_regmap_read+0x7c/0x144) r6:00000180 r5:9f1fc800 r4:9f1fc800 r3:80365f3c [<80365628>] (_regmap_read) from [<803657bc>] (regmap_read+0x50/0x70) r9:00000000 r8:9f732400 r7:9f1efe6c r6:9f1efe6c r5:00000180 r4:9f1fc800 [<8036576c>] (regmap_read) from [<80452ac0>] (imx_get_temp+0x134/0x1a4) r6:9f1efeb4 r5:9f1fc800 r4:9e95f910 r3:00000001 [<8045298c>] (imx_get_temp) from [<8044e11c>] (thermal_zone_get_temp+0x58/0x74) r7:9f72ef40 r6:9f1efeb4 r5:9e93d5e8 r4:9e93d400 [<8044e0c4>] (thermal_zone_get_temp) from [<8044fd14>] (thermal_zone_device_update+0x34/0xec) r6:808e1978 r5:9e93d400 r4:9e93d608 r3:8045298c [<8044fce0>] (thermal_zone_device_update) from [<8044fde8>] (thermal_zone_device_check+0x1c/0x20) r5:9e481380 r4:9e93d608 [<8044fdcc>] (thermal_zone_device_check) from [<80038d50>] (process_one_work+0x160/0x3d4) [<80038bf0>] (process_one_work) from [<80039754>] (worker_thread+0x5c/0x4f4) r10:9f72ef40 r9:00000008 r8:9e481380 r7:9e481398 r6:9f72ef40 r5:9f1ee020 r4:9f72ef54 [<800396f8>] (worker_thread) from [<8003e020>] (kthread+0xf0/0x108) r10:00000000 r9:00000000 r8:00000000 r7:800396f8 r6:9e481380 r5:00000000 r4:9e4f2ec0 [<8003df30>] (kthread) from [<8000eb60>] (ret_from_fork+0x14/0x34) r7:00000000 r6:00000000 r5:8003df30 r4:9e4f2ec0 Code: e3140040 1a00001a e3140020 1a000016 (e596002c) ---[ end trace 193c15c2494ec960 ]--- Fixes: bdb0066d (mfd: syscon: Decouple syscon interface from platform devices) Signed-off-by:
Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by:
Mark Brown <broonie@kernel.org> Signed-off-by:
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Uwe Kleine-König authored
commit 391949b6 upstream. With spidev the mesg->complete callback points to spidev_complete. Calling this unblocks spidev_sync and so spidev_sync_write finishes. As the struct spi_message just read is a local variable in spidev_sync_write and recording the trace event accesses this message the recording is better done first. The same can happen for spidev_sync_read. This fixes an oops observed on a 3.14-rt system with spidev activity after echo 1 > /sys/kernel/debug/tracing/events/spi/enable . Signed-off-by:
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by:
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Radim Krčmář authored
commit 0790ec17 upstream. If EPT was enabled, unrestricted_guest was allowed in L1 regardless of L0. L1 triple faulted when running L2 guest that required emulation. Another side effect was 'WARN_ON_ONCE(vmx->nested.nested_run_pending)' in L0's dmesg: WARNING: CPU: 0 PID: 0 at arch/x86/kvm/vmx.c:9190 nested_vmx_vmexit+0x96e/0xb00 [kvm_intel] () Prevent this scenario by masking SECONDARY_EXEC_UNRESTRICTED_GUEST when the host doesn't have it enabled. Fixes: 78051e3b ("KVM: nVMX: Disable unrestricted mode if ept=0") Tested-By:
Kashyap Chamarthy <kchamart@redhat.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com> Signed-off-by:
Marcelo Tosatti <mtosatti@redhat.com> [ luis: backported to 3.16: - use nested_vmx_secondary_ctls_high instead of vmx->nested.nested_vmx_secondary_ctls_high ] Signed-off-by:
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Ameya Palande authored
commit c8648508 upstream. On success, callback function returns 0. So invert the if condition check so that we can break out of loop. Signed-off-by:
Ameya Palande <2ameya@gmail.com> Signed-off-by:
Lee Jones <lee.jones@linaro.org> Signed-off-by:
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Ivan T. Ivanov authored
commit 12cb89e3 upstream. num-cs is 32 bit property, don't read just upper 16 bits. Fixes: 4a8573ab (spi: qup: Remove chip select function) Signed-off-by:
Ivan T. Ivanov <iivanov@mm-sol.com> Signed-off-by:
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Sudip Mukherjee authored
commit ff6b8090 upstream. we have already allocated memory for nbd_dev, but we were not releasing that memory and just returning the error value. Signed-off-by:
Sudip Mukherjee <sudip@vectorindia.org> Acked-by:
Paul Clements <Paul.Clements@SteelEye.com> Signed-off-by:
Markus Pargmann <mpa@pengutronix.de> Signed-off-by:
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