- 16 Dec, 2017 5 commits
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Martin Kelly authored
commit 6aa8d594 upstream. In mcba_usb, we have observed that when you unplug the device, the driver will endlessly resubmit failing URBs, which can cause CPU stalls. This issue is fixed in mcba_usb by catching the codes seen on device disconnect (-EPIPE and -EPROTO). This driver also resubmits in the case of -EPIPE and -EPROTO, so fix it in the same way. Signed-off-by:
Martin Kelly <mkelly@xevo.com> Signed-off-by:
Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Jimmy Assarsson authored
commit 8bd13bd5 upstream. Avoid flooding the kernel log with "Formate error", if incomplete message are received. Signed-off-by:
Jimmy Assarsson <jimmyassarsson@gmail.com> Signed-off-by:
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Jimmy Assarsson authored
commit e84f44eb upstream. The conditon in the while-loop becomes true when actual_length is less than 2 (MSG_HEADER_LEN). In best case we end up with a former, already dispatched msg, that got msg->len greater than actual_length. This will result in a "Format error" error printout. Problem seen when unplugging a Kvaser USB device connected to a vbox guest. warning: comparison between signed and unsigned integer expressions [-Wsign-compare] Signed-off-by:
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Jimmy Assarsson authored
commit 435019b4 upstream. The allocated buffer was not freed if usb_submit_urb() failed. Signed-off-by:
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Oliver Stäbler authored
commit f6c23b17 upstream. After commit d75b1ade ("net: less interrupt masking in NAPI") napi repoll is done only when work_done == budget. So we need to return budget if there are still packets to receive. Signed-off-by:
Oliver Stäbler <oliver.staebler@bytesatwork.ch> Signed-off-by:
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- 09 Dec, 2017 35 commits
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Greg Kroah-Hartman authored
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Vitaly Kuznetsov authored
commit d86b5672 upstream. Unavoidable crashes in netfront_resume() and netback_changed() after a previous fail in talk_to_netback() (e.g. when we fail to read MAC from xenstore) were discovered. The failure path in talk_to_netback() does unregister/free for netdev but we don't reset drvdata and we try accessing it after resume. Fix the bug by removing the whole xen device completely with device_unregister(), this guarantees we won't have any calls into netfront after a failure. Signed-off-by:
Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Cc: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by:
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Colin Ian King authored
commit 1d5a3158 upstream. The variable temp is incorrectly being updated, instead it should be offset otherwise the loop just reads the same capability value and loops forever. Thanks to Alan Stern for pointing out the correct fix to my original fix. Fix also cleans up clang warning: drivers/usb/host/ehci-dbg.c:840:4: warning: Value stored to 'temp' is never read Fixes: d49d4317 ("USB: misc ehci updates") Signed-off-by:
Colin Ian King <colin.king@canonical.com> Acked-by:
Alan Stern <stern@rowland.harvard.edu> Signed-off-by:
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Oliver Neukum authored
commit 446f666d upstream. USBDEVFS_URB_ISO_ASAP must be accepted only for ISO endpoints. Improve sanity checking. Reported-by:
Andrey Konovalov <andreyknvl@google.com> Signed-off-by:
Oliver Neukum <oneukum@suse.com> Acked-by:
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Dan Carpenter authored
commit 57999d11 upstream. There used to be an integer overflow check in proc_do_submiturb() but we removed it. It turns out that it's still required. The uurb->buffer_length variable is a signed integer and it's controlled by the user. It can lead to an integer overflow when we do: num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE); If we strip away the macro then that line looks like this: num_sgs = (uurb->buffer_length + USB_SG_SIZE - 1) / USB_SG_SIZE; ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ It's the first addition which can overflow. Fixes: 1129d270 ("USB: Increase usbfs transfer limit") Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Acked-by:
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Mateusz Berezecki authored
commit 1129d270 upstream. Promote a variable keeping track of USB transfer memory usage to a wider data type and allow for higher bandwidth transfers from a large number of USB devices connected to a single host. Signed-off-by:
Mateusz Berezecki <mateuszb@fastmail.fm> Signed-off-by:
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Masakazu Mokuno authored
commit 81cf4a45 upstream. As most of BOS descriptors are longer in length than their header 'struct usb_dev_cap_header', comparing solely with it is not sufficient to avoid out-of-bounds access to BOS descriptors. This patch adds descriptor type specific length check in usb_get_bos_descriptor() to fix the issue. Signed-off-by:
Masakazu Mokuno <masakazu.mokuno@gmail.com> Signed-off-by:
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John Youn authored
commit 446fa3a9 upstream. The SuperspeedPlus Device Capability Descriptor has a variable size depending on the number of sublink speed attributes. This patch adds a macro to calculate that size. The macro takes one argument, the Sublink Speed Attribute Count (SSAC) as reported by the descriptor in bmAttributes[4:0]. See USB 3.1 9.6.2.5, Table 9-19. Signed-off-by:
John Youn <johnyoun@synopsys.com> Signed-off-by:
Felipe Balbi <balbi@kernel.org> Signed-off-by:
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Mathias Nyman authored
commit faee822c upstream. USB 3.1 devices that support precision time measurement have an additional PTM cabaility descriptor as part of the full BOS descriptor Look for this descriptor while parsing the BOS descriptor, and store it in struct usb_hub_bos if it exists. Signed-off-by:
Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by:
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Yu Chen authored
commit 80e45769 upstream. Check vdev->real_port 0 to avoid panic [ 9.261347] [<ffffff800884a390>] xhci_free_virt_devices_depth_first+0x58/0x108 [ 9.261352] [<ffffff800884a814>] xhci_mem_cleanup+0x1bc/0x570 [ 9.261355] [<ffffff8008842de8>] xhci_stop+0x140/0x1c8 [ 9.261365] [<ffffff80087ed304>] usb_remove_hcd+0xfc/0x1d0 [ 9.261369] [<ffffff80088551c4>] xhci_plat_remove+0x6c/0xa8 [ 9.261377] [<ffffff80086e928c>] platform_drv_remove+0x2c/0x70 [ 9.261384] [<ffffff80086e6ea0>] __device_release_driver+0x80/0x108 [ 9.261387] [<ffffff80086e7a1c>] device_release_driver+0x2c/0x40 [ 9.261392] [<ffffff80086e5f28>] bus_remove_device+0xe0/0x120 [ 9.261396] [<ffffff80086e2e34>] device_del+0x114/0x210 [ 9.261399] [<ffffff80086e9e00>] platform_device_del+0x30/0xa0 [ 9.261403] [<ffffff8008810bdc>] dwc3_otg_work+0x204/0x488 [ 9.261407] [<ffffff80088133fc>] event_work+0x304/0x5b8 [ 9.261414] [<ffffff80080e31b0>] process_one_work+0x148/0x490 [ 9.261417] [<ffffff80080e3548>] worker_thread+0x50/0x4a0 [ 9.261421] [<ffffff80080e9ea0>] kthread+0xe8/0x100 [ 9.261427] [<ffffff8008083680>] ret_from_fork+0x10/0x50 The problem can occur if xhci_plat_remove() is called shortly after xhci_plat_probe(). While xhci_free_virt_devices_depth_first been called before the device has been setup and get real_port initialized. The problem occurred on Hikey960 and was reproduced by Guenter Roeck on Kevin with chromeos-4.4. Fixes: ee8665e2 ("xhci: free xhci virtual devices with leaf nodes first") Cc: Guenter Roeck <groeck@google.com> Reviewed-by:
Guenter Roeck <groeck@chromium.org> Tested-by:
Guenter Roeck <linux@roeck-us.net> Signed-off-by:
Fan Ning <fanning4@hisilicon.com> Signed-off-by:
Li Rui <lirui39@hisilicon.com> Signed-off-by:
yangdi <yangdi10@hisilicon.com> Signed-off-by:
Yu Chen <chenyu56@huawei.com> Signed-off-by:
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Mike Looijmans authored
commit 973593a9 upstream. Sometimes the USB device gets confused about the state of the initialization and the connection fails. In particular, the device thinks that it's already set up and running while the host thinks the device still needs to be configured. To work around this issue, power-cycle the hub's output to issue a sort of "reset" to the device. This makes the device restart its state machine and then the initialization succeeds. This fixes problems where the kernel reports a list of errors like this: usb 1-1.3: device not accepting address 19, error -71 The end result is a non-functioning device. After this patch, the sequence becomes like this: usb 1-1.3: new high-speed USB device number 18 using ci_hdrc usb 1-1.3: device not accepting address 18, error -71 usb 1-1.3: new high-speed USB device number 19 using ci_hdrc usb 1-1.3: device not accepting address 19, error -71 usb 1-1-port3: attempt power cycle usb 1-1.3: new high-speed USB device number 21 using ci_hdrc usb-storage 1-1.3:1.2: USB Mass Storage device detected Signed-off-by:
Mike Looijmans <mike.looijmans@topic.nl> Acked-by:
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Greg Kroah-Hartman authored
This reverts commit c4baa4a5 which is commit 28f5a8a7 upstream. It shouldn't be applied to the 4.4-stable tree. Ben and Alex write: > Now that ocfs2_setattr() calls this outside of the inode locked region, > what prevents another task adding a new dio request immediately > afterward? > In the kernel 4.6, firstly, we use the inode_lock() in do_truncate() to prevent another bio to be issued from this node. Furthermore, we use the ocfs2_rw_lock() and ocfs2_inode_lock() in ocfs2_setattr() to guarantee no more bio will be issued from the other nodes in this cluster. > Also, ocfs2_dio_end_io_write() was introduced in 4.6 and it looks like > the dio completion path didn't previously take the inode lock. So it > doesn't look this fix is needed in 3.18 or 4.4. Yes, ocfs2_dio_end_io_write() was introduced in 4.6 and the problem this patch fixes is only exist in the kernel 4.6 and above 4.6. Reported-by:
Ben Hutchings <ben.hutchings@codethink.co.uk> Cc: Alex Chen <alex.chen@huawei.com> Cc: Jun Piao <piaojun@huawei.com> Cc: Joseph Qi <jiangqi903@gmail.com> Cc: Changwei Ge <ge.changwei@h3c.com> Cc: Mark Fasheh <mfasheh@versity.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Rui Sousa authored
[ Upstream commit 01f8902b ] Fix hardware setup of multicast address hash: - Never clear the hardware hash (to avoid packet loss) - Construct the hash register values in software and then write once to hardware Signed-off-by:
Rui Sousa <rui.sousa@nxp.com> Signed-off-by:
Fugang Duan <fugang.duan@nxp.com> Signed-off-by:
Sasha Levin <alexander.levin@verizon.com> Signed-off-by:
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Ross Lagerwall authored
[ Upstream commit e2e004ac ] This fixes a crash when running out of grant refs when creating many queues across many netdevs. * If creating queues fails (i.e. there are no grant refs available), call xenbus_dev_fatal() to ensure that the xenbus device is set to the closed state. * If no queues are created, don't call xennet_disconnect_backend as netdev->real_num_tx_queues will not have been set correctly. * If setup_netfront() fails, ensure that all the queues created are cleaned up, not just those that have been set up. * If any queues were set up and an error occurs, call xennet_destroy_queues() to clean up the napi context. * If any fatal error occurs, unregister and destroy the netdev to avoid leaving around a half setup network device. Signed-off-by:
Ross Lagerwall <ross.lagerwall@citrix.com> Reviewed-by:
Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by:
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Jan Kara authored
[ Upstream commit 0911d004 ] Some ->page_mkwrite handlers may return VM_FAULT_RETRY as its return code (GFS2 or Lustre can definitely do this). However VM_FAULT_RETRY from ->page_mkwrite is completely unhandled by the mm code and results in locking and writeably mapping the page which definitely is not what the caller wanted. Fix Lustre and block_page_mkwrite_ret() used by other filesystems (notably GFS2) to return VM_FAULT_NOPAGE instead which results in bailing out from the fault code, the CPU then retries the access, and we fault again effectively doing what the handler wanted. Link: http://lkml.kernel.org/r/20170203150729.15863-1-jack@suse.czSigned-off-by:
Jan Kara <jack@suse.cz> Reported-by:
Al Viro <viro@ZenIV.linux.org.uk> Reviewed-by:
Jinshan Xiong <jinshan.xiong@intel.com> Cc: Matthew Wilcox <willy@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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Jason Baron authored
[ Upstream commit 56d80622 ] sock_reset_flag() maps to __clear_bit() not the atomic version clear_bit(). Thus, we need smp_mb(), smp_mb__after_atomic() is not sufficient. Fixes: 3c715127 ("tcp: add memory barriers to write space paths") Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by:
Jason Baron <jbaron@akamai.com> Acked-by:
Eric Dumazet <edumazet@google.com> Reported-by:
Oleg Nesterov <oleg@redhat.com> Signed-off-by:
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Iago Abal authored
[ Upstream commit 91539eb1 ] The static bug finder EBA (http://www.iagoabal.eu/eba/) reported the following double-lock bug: Double lock: 1. spin_lock_irqsave(pch->lock, flags) at pl330_free_chan_resources:2236; 2. call to function `pl330_release_channel' immediately after; 3. call to function `dma_pl330_rqcb' in line 1753; 4. spin_lock_irqsave(pch->lock, flags) at dma_pl330_rqcb:1505. I have fixed it as suggested by Marek Szyprowski. First, I have replaced `pch->lock' with `pl330->lock' in functions `pl330_alloc_chan_resources' and `pl330_free_chan_resources'. This avoids the double-lock by acquiring a different lock than `dma_pl330_rqcb'. NOTE that, as a result, `pl330_free_chan_resources' executes `list_splice_tail_init' on `pch->work_list' under lock `pl330->lock', whereas in the rest of the code `pch->work_list' is protected by `pch->lock'. I don't know if this may cause race conditions. Similarly `pch->cyclic' is written by `pl330_alloc_chan_resources' under `pl330->lock' but read by `pl330_tx_submit' under `pch->lock'. Second, I have removed locking from `pl330_request_channel' and `pl330_release_channel' functions. Function `pl330_request_channel' is only called from `pl330_alloc_chan_resources', so the lock is already held. Function `pl330_release_channel' is called from `pl330_free_chan_resources', which already holds the lock, and from `pl330_del'. Function `pl330_del' is called in an error path of `pl330_probe' and at the end of `pl330_remove', but I assume that there cannot be concurrent accesses to the protected data at those points. Signed-off-by:
Iago Abal <mail@iagoabal.eu> Reviewed-by:
Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by:
Vinod Koul <vinod.koul@intel.com> Signed-off-by:
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Parthasarathy Bhuvaragan authored
[ Upstream commit 35e22e49 ] In tipc_server_stop(), we iterate over the connections with limiting factor as server's idr_in_use. We ignore the fact that this variable is decremented in tipc_close_conn(), leading to premature exit. In this commit, we iterate until the we have no connections left. Acked-by:
Ying Xue <ying.xue@windriver.com> Acked-by:
Jon Maloy <jon.maloy@ericsson.com> Tested-by:
John Thompson <thompa.atl@gmail.com> Signed-off-by:
Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Signed-off-by:
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Colin Ian King authored
[ Upstream commit 0e73fc9a ] The comparison on the timeout can lead to an array overrun read on sctp_timer_tbl because of an off-by-one error. Fix this by using < instead of <= and also compare to the array size rather than SCTP_EVENT_TIMEOUT_MAX. Fixes CoverityScan CID#1397639 ("Out-of-bounds read") Signed-off-by:
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Andrzej Hajda authored
[ Upstream commit 11d8bcef ] DECON_TV requires STANDALONE_UPDATE after output enabling, otherwise it does not start. This change is neutral for DECON. Signed-off-by:
Andrzej Hajda <a.hajda@samsung.com> Signed-off-by:
Inki Dae <inki.dae@samsung.com> Signed-off-by:
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Trond Myklebust authored
[ Upstream commit c6180a62 ] If the server reboots multiple times, the client should rely on the server to tell it that it cannot reclaim state as per section 9.6.3.4 in RFC7530 and section 8.4.2.1 in RFC5661. Currently, the client is being to conservative, and is assuming that if the server reboots while state recovery is in progress, then it must ignore state that was not recovered before the reboot. Signed-off-by:
Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by:
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Christoffer Dall authored
[ Upstream commit 63e41226 ] When a VCPU blocks (WFI) and has programmed the vtimer, we program a soft timer to expire in the future to wake up the vcpu thread when appropriate. Because such as wake up involves a vcpu kick, and the timer expire function can get called from interrupt context, and the kick may sleep, we have to schedule the kick in the work function. The work function currently has a warning that gets raised if it turns out that the timer shouldn't fire when it's run, which was added because the idea was that in that case the work should never have been cancelled. However, it turns out that this whole thing is racy and we can get spurious warnings. The problem is that we clear the armed flag in the work function, which may run in parallel with the kvm_timer_unschedule->timer_disarm() call. This results in a possible situation where the timer_disarm() call does not call cancel_work_sync(), which effectively synchronizes the completion of the work function with running the VCPU. As a result, the VCPU thread proceeds before the work function completees, causing changes to the timer state such that kvm_timer_should_fire(vcpu) returns false in the work function. All we do in the work function is to kick the VCPU, and an occasional rare extra kick never harmed anyone. Since the race above is extremely rare, we don't bother checking if the race happens but simply remove the check and the clearing of the armed flag from the work function. Reported-by:
Matthias Brugger <mbrugger@suse.com> Reviewed-by:
Marc Zyngier <marc.zyngier@arm.com> Signed-off-by:
Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by:
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Benjamin Coddington authored
[ Upstream commit 4b09ec4b ] I have reports of a crash that look like __fput() was called twice for a NFSv4.0 file. It seems possible that the state manager could try to reclaim a lock and take a reference on the fl->fl_file at the same time the file is being released if, during the close(), a signal interrupts the wait for outstanding IO while removing locks which then skips the removal of that lock. Since 83bfff23 ("nfs4: have do_vfs_lock take an inode pointer") has removed the need to traverse fl->fl_file->f_inode in nfs4_lock_done(), taking that reference is no longer necessary. Signed-off-by:
Benjamin Coddington <bcodding@redhat.com> Reviewed-by:
Jeff Layton <jlayton@redhat.com> Signed-off-by:
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Kazuya Mizuguchi authored
[ Upstream commit 18a3ed59 ] Remove Rx overflow log messages as in an environment where logging results in network traffic logging may cause further overflows. Fixes: c156633f ("Renesas Ethernet AVB driver proper") Signed-off-by:
Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com> [simon: reworked changelog] Signed-off-by:
Simon Horman <horms+renesas@verge.net.au> Acked-by:
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by:
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Vlad Tsyrklevich authored
[ Upstream commit ce7e40c4 ] ipddp_route structs contain alignment padding so kernel heap memory is leaked when they are copied to user space in ipddp_ioctl(SIOCFINDIPDDPRT). Change kmalloc() to kzalloc() to clear that memory. Signed-off-by:
Vlad Tsyrklevich <vlad@tsyrklevich.net> Signed-off-by:
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David Forster authored
[ Upstream commit 93e246f7 ] vti6 interface is registered before the rtnl_link_ops block is attached. As a result the resulting RTM_NEWLINK is missing IFLA_INFO_KIND. Re-order attachment of rtnl_link_ops block to fix. Signed-off-by:
Dave Forster <dforster@brocade.com> Signed-off-by:
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Peter Ujfalusi authored
[ Upstream commit 65727977 ] OMAP1510, OMAP5910 and OMAP310 have only 9 logical channels. OMAP1610, OMAP5912, OMAP1710, OMAP730, and OMAP850 have 16 logical channels available. The wired 17 for the lch_count must have been used to cover the 16 + 1 dedicated LCD channel, in reality we can only use 9 or 16 channels. The d->chan_count is not used by the omap-dma stack, so we can skip the setup. chan_count was configured to the number of logical channels and not the actual number of physical channels anyways. Signed-off-by:
Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by:
Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by:
Tony Lindgren <tony@atomide.com> Signed-off-by:
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Florian Fainelli authored
[ Upstream commit 38e5a855 ] Inserting the TSB means adding an extra 8 bytes in front the of packet that is going to be used as metadata information by the TDMA engine, but stripped off, so it does not really help with the packet padding. For some odd packet sizes that fall below the 60 bytes payload (e.g: ARP) we can end-up padding them after the TSB insertion, thus making them 64 bytes, but with the TDMA stripping off the first 8 bytes, they could still be smaller than 64 bytes which is required to ingress the switch. Fix this by swapping the padding and TSB insertion, guaranteeing that the packets have the right sizes. Fixes: 80105bef ("net: systemport: add Broadcom SYSTEMPORT Ethernet MAC driver") Signed-off-by:
Florian Fainelli <f.fainelli@gmail.com> Signed-off-by:
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Florian Fainelli authored
[ Upstream commit bb7da333 ] Since we need to pad our packets, utilize skb_put_padto() which increases skb->len by how much we need to pad, allowing us to eliminate the test on skb->len right below. Signed-off-by:
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Masami Hiramatsu authored
[ Upstream commit 5bb4fc2d ] Disable preemption in ftrace-based jprobe handlers as described in Documentation/kprobes.txt: "Probe handlers are run with preemption disabled." This will fix jprobes behavior when CONFIG_PREEMPT=y. Signed-off-by:
Masami Hiramatsu <mhiramat@kernel.org> Cc: Alexei Starovoitov <ast@fb.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/150581530024.32348.9863783558598926771.stgit@devboxSigned-off-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
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Thomas Richter authored
[ Upstream commit 22905582 ] Command perf test -v 16 (Setup struct perf_event_attr test) always reports success even if the test case fails. It works correctly if you also specify -F (for don't fork). root@s35lp76 perf]# ./perf test -v 16 15: Setup struct perf_event_attr : --- start --- running './tests/attr/test-record-no-delay' [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.002 MB /tmp/tmp4E1h7R/perf.data (1 samples) ] expected task=0, got 1 expected precise_ip=0, got 3 expected wakeup_events=1, got 0 FAILED './tests/attr/test-record-no-delay' - match failure test child finished with 0 ---- end ---- Setup struct perf_event_attr: Ok The reason for the wrong error reporting is the return value of the system() library call. It is called in run_dir() file tests/attr.c and returns the exit status, in above case 0xff00. This value is given as parameter to the exit() function which can only handle values 0-0xff. The child process terminates with exit value of 0 and the parent does not detect any error. This patch corrects the error reporting and prints the correct test result. Signed-off-by:
Thomas-Mich Richter <tmricht@linux.vnet.ibm.com> Acked-by:
Jiri Olsa <jolsa@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Thomas-Mich Richter <tmricht@linux.vnet.ibm.com> LPU-Reference: 20170913081209.39570-2-tmricht@linux.vnet.ibm.com Link: http://lkml.kernel.org/n/tip-rdube6rfcjsr1nzue72c7lqn@git.kernel.orgSigned-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by:
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Jibin Xu authored
[ Upstream commit b00bebbc ] When kernel configuration SMP,PREEMPT and DEBUG_PREEMPT are enabled, echo 1 >/proc/sys/kernel/sysrq echo p >/proc/sysrq-trigger kernel will print call trace as below: sysrq: SysRq : Show Regs BUG: using __this_cpu_read() in preemptible [00000000] code: sh/435 caller is __this_cpu_preempt_check+0x18/0x20 Call trace: [<ffffff8008088e80>] dump_backtrace+0x0/0x1d0 [<ffffff8008089074>] show_stack+0x24/0x30 [<ffffff8008447970>] dump_stack+0x90/0xb0 [<ffffff8008463950>] check_preemption_disabled+0x100/0x108 [<ffffff8008463998>] __this_cpu_preempt_check+0x18/0x20 [<ffffff80084c9194>] sysrq_handle_showregs+0x1c/0x40 [<ffffff80084c9c7c>] __handle_sysrq+0x12c/0x1a0 [<ffffff80084ca140>] write_sysrq_trigger+0x60/0x70 [<ffffff8008251e00>] proc_reg_write+0x90/0xd0 [<ffffff80081f1788>] __vfs_write+0x48/0x90 [<ffffff80081f241c>] vfs_write+0xa4/0x190 [<ffffff80081f3354>] SyS_write+0x54/0xb0 [<ffffff80080833f0>] el0_svc_naked+0x24/0x28 This can be seen on a common board like an r-pi3. This happens because when echo p >/proc/sysrq-trigger, get_irq_regs() is called outside of IRQ context, if preemption is enabled in this situation,kernel will print the call trace. Since many prior discussions on the mailing lists have made it clear that get_irq_regs either just returns NULL or stale data when used outside of IRQ context,we simply avoid calling it outside of IRQ context. Signed-off-by:
Jibin Xu <jibin.xu@windriver.com> Signed-off-by:
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Gustavo A. R. Silva authored
[ Upstream commit a8e9b186 ] Add missing break statement in order to prevent the code from falling through. Signed-off-by:
Gustavo A. R. Silva <garsilva@embeddedor.com> Cc: Qiuxu Zhuo <qiuxu.zhuo@intel.com> Cc: linux-edac <linux-edac@vger.kernel.org> Link: http://lkml.kernel.org/r/20171016174029.GA19757@embeddedor.comSigned-off-by:
Borislav Petkov <bp@suse.de> Signed-off-by:
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Dave Hansen authored
[ Upstream commit da20ab35 ] We do not have tracepoints for sys_modify_ldt() because we define it directly instead of using the normal SYSCALL_DEFINEx() macros. However, there is a reason sys_modify_ldt() does not use the macros: it has an 'int' return type instead of 'unsigned long'. This is a bug, but it's a bug cemented in the ABI. What does this mean? If we return -EINVAL from a function that returns 'int', we have 0x00000000ffffffea in %rax. But, if we return -EINVAL from a function returning 'unsigned long', we end up with 0xffffffffffffffea in %rax, which is wrong. To work around this and maintain the 'int' behavior while using the SYSCALL_DEFINEx() macros, so we add a cast to 'unsigned int' in both implementations of sys_modify_ldt(). Signed-off-by:
Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by:
Andy Lutomirski <luto@kernel.org> Reviewed-by:
Brian Gerst <brgerst@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20171018172107.1A79C532@viggo.jf.intel.comSigned-off-by:
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Aaron Sierra authored
[ Upstream commit 0ab84da2 ] The upper four bits of the XR17V35x fractional divisor register (DLD) control general chip function (RS-485 direction pin polarity, multidrop mode, XON/XOFF parity check, and fast IR mode). Don't allow these bits to be clobbered when setting the baudrate. Signed-off-by:
Aaron Sierra <asierra@xes-inc.com> Signed-off-by:
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