- 20 Jan, 2017 33 commits
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Wei Fang authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit d2a14525 upstream. A race between scanning and fc_remote_port_delete() may result in a permanent stop if the device gets blocked before scsi_sysfs_add_sdev() and unblocked after. The reason is that blocking a device sets both the SDEV_BLOCKED state and the QUEUE_FLAG_STOPPED. However, scsi_sysfs_add_sdev() unconditionally sets SDEV_RUNNING which causes the device to be ignored by scsi_target_unblock() and thus never have its QUEUE_FLAG_STOPPED cleared leading to a device which is apparently running but has a stopped queue. We actually have two places where SDEV_RUNNING is set: once in scsi_add_lun() which respects the blocked flag and once in scsi_sysfs_add_sdev() which doesn't. Since the second set is entirely spurious, simply remove it to fix the problem. Reported-by:
Zengxi Chen <chenzengxi@huawei.com> Signed-off-by:
Wei Fang <fangwei1@huawei.com> Reviewed-by:
Ewan D. Milne <emilne@redhat.com> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
Tim Gardner <tim.gardner@canonical.com> Signed-off-by:
Luis Henriques <luis.henriques@canonical.com>
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Steffen Maier authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 6f2ce1c6 upstream. It is unavoidable that zfcp_scsi_queuecommand() has to finish requests with DID_IMM_RETRY (like fc_remote_port_chkready()) during the time window when zfcp detected an unavailable rport but fc_remote_port_delete(), which is asynchronous via zfcp_scsi_schedule_rport_block(), has not yet blocked the rport. However, for the case when the rport becomes available again, we should prevent unblocking the rport too early. In contrast to other FCP LLDDs, zfcp has to open each LUN with the FCP channel hardware before it can send I/O to a LUN. So if a port already has LUNs attached and we unblock the rport just after port recovery, recoveries of LUNs behind this port can still be pending which in turn force zfcp_scsi_queuecommand() to unnecessarily finish requests with DID_IMM_RETRY. This also opens a time window with unblocked rport (until the followup LUN reopen recovery has finished). If a scsi_cmnd timeout occurs during this time window fc_timed_out() cannot work as desired and such command would indeed time out and trigger scsi_eh. This prevents a clean and timely path failover. This should not happen if the path issue can be recovered on FC transport layer such as path issues involving RSCNs. Fix this by only calling zfcp_scsi_schedule_rport_register(), to asynchronously trigger fc_remote_port_add(), after all LUN recoveries as children of the rport have finished and no new recoveries of equal or higher order were triggered meanwhile. Finished intentionally includes any recovery result no matter if successful or failed (still unblock rport so other successful LUNs work). For simplicity, we check after each finished LUN recovery if there is another LUN recovery pending on the same port and then do nothing. We handle the special case of a successful recovery of a port without LUN children the same way without changing this case's semantics. For debugging we introduce 2 new trace records written if the rport unblock attempt was aborted due to still unfinished or freshly triggered recovery. The records are only written above the default trace level. Benjamin noticed the important special case of new recovery that can be triggered between having given up the erp_lock and before calling zfcp_erp_action_cleanup() within zfcp_erp_strategy(). We must avoid the following sequence: ERP thread rport_work other context ------------------------- -------------- -------------------------------- port is unblocked, rport still blocked, due to pending/running ERP action, so ((port->status & ...UNBLOCK) != 0) and (port->rport == NULL) unlock ERP zfcp_erp_action_cleanup() case ZFCP_ERP_ACTION_REOPEN_LUN: zfcp_erp_try_rport_unblock() ((status & ...UNBLOCK) != 0) [OLD!] zfcp_erp_port_reopen() lock ERP zfcp_erp_port_block() port->status clear ...UNBLOCK unlock ERP zfcp_scsi_schedule_rport_block() port->rport_task = RPORT_DEL queue_work(rport_work) zfcp_scsi_rport_work() (port->rport_task != RPORT_ADD) port->rport_task = RPORT_NONE zfcp_scsi_rport_block() if (!port->rport) return zfcp_scsi_schedule_rport_register() port->rport_task = RPORT_ADD queue_work(rport_work) zfcp_scsi_rport_work() (port->rport_task == RPORT_ADD) port->rport_task = RPORT_NONE zfcp_scsi_rport_register() (port->rport == NULL) rport = fc_remote_port_add() port->rport = rport; Now the rport was erroneously unblocked while the zfcp_port is blocked. This is another situation we want to avoid due to scsi_eh potential. This state would at least remain until the new recovery from the other context finished successfully, or potentially forever if it failed. In order to close this race, we take the erp_lock inside zfcp_erp_try_rport_unblock() when checking the status of zfcp_port or LUN. With that, the possible corresponding rport state sequences would be: (unblock[ERP thread],block[other context]) if the ERP thread gets erp_lock first and still sees ((port->status & ...UNBLOCK) != 0), (block[other context],NOP[ERP thread]) if the ERP thread gets erp_lock after the other context has already cleard ...UNBLOCK from port->status. Since checking fields of struct erp_action is unsafe because they could have been overwritten (re-used for new recovery) meanwhile, we only check status of zfcp_port and LUN since these are only changed under erp_lock elsewhere. Regarding the check of the proper status flags (port or port_forced are similar to the shown adapter recovery): [zfcp_erp_adapter_shutdown()] zfcp_erp_adapter_reopen() zfcp_erp_adapter_block() * clear UNBLOCK ---------------------------------------+ zfcp_scsi_schedule_rports_block() | write_lock_irqsave(&adapter->erp_lock, flags);-------+ | zfcp_erp_action_enqueue() | | zfcp_erp_setup_act() | | * set ERP_INUSE -----------------------------------|--|--+ write_unlock_irqrestore(&adapter->erp_lock, flags);--+ | | .context-switch. | | zfcp_erp_thread() | | zfcp_erp_strategy() | | write_lock_irqsave(&adapter->erp_lock, flags);------+ | | ... | | | zfcp_erp_strategy_check_target() | | | zfcp_erp_strategy_check_adapter() | | | zfcp_erp_adapter_unblock() | | | * set UNBLOCK -----------------------------------|--+ | zfcp_erp_action_dequeue() | | * clear ERP_INUSE ---------------------------------|-----+ ... | write_unlock_irqrestore(&adapter->erp_lock, flags);-+ Hence, we should check for both UNBLOCK and ERP_INUSE because they are interleaved. Also we need to explicitly check ERP_FAILED for the link down case which currently does not clear the UNBLOCK flag in zfcp_fsf_link_down_info_eval(). Signed-off-by:
Steffen Maier <maier@linux.vnet.ibm.com> Fixes: 8830271c ("[SCSI] zfcp: Dont fail SCSI commands when transitioning to blocked fc_rport") Fixes: a2fa0aed ("[SCSI] zfcp: Block FC transport rports early on errors") Fixes: 5f852be9 ("[SCSI] zfcp: Fix deadlock between zfcp ERP and SCSI") Fixes: 338151e0 ("[SCSI] zfcp: make use of fc_remote_port_delete when target port is unavailable") Fixes: 3859f6a2 ("[PATCH] zfcp: add rports to enable scsi_add_device to work again") Reviewed-by:
Benjamin Block <bblock@linux.vnet.ibm.com> Signed-off-by:
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Steffen Maier authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 56d23ed7 upstream. Since quite a while, Linux issues enough SCSI commands per scsi_device which successfully return with FCP_RESID_UNDER, FSF_FCP_RSP_AVAILABLE, and SAM_STAT_GOOD. This floods the HBA trace area and we cannot see other and important HBA trace records long enough. Therefore, do not trace HBA response errors for pure benign residual under counts at the default trace level. This excludes benign residual under count combined with other validity bits set in FCP_RSP_IU, such as FCP_SNS_LEN_VAL. For all those other cases, we still do want to see both the HBA record and the corresponding SCSI record by default. Signed-off-by:
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Benjamin Block authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit dac37e15 upstream. When SCSI EH invokes zFCP's callbacks for eh_device_reset_handler() and eh_target_reset_handler(), it expects us to relent the ownership over the given scsi_cmnd and all other scsi_cmnds within the same scope - LUN or target - when returning with SUCCESS from the callback ('release' them). SCSI EH can then reuse those commands. We did not follow this rule to release commands upon SUCCESS; and if later a reply arrived for one of those supposed to be released commands, we would still make use of the scsi_cmnd in our ingress tasklet. This will at least result in undefined behavior or a kernel panic because of a wrong kernel pointer dereference. To fix this, we NULLify all pointers to scsi_cmnds (struct zfcp_fsf_req *)->data in the matching scope if a TMF was successful. This is done under the locks (struct zfcp_adapter *)->abort_lock and (struct zfcp_reqlist *)->lock to prevent the requests from being removed from the request-hashtable, and the ingress tasklet from making use of the scsi_cmnd-pointer in zfcp_fsf_fcp_cmnd_handler(). For cases where a reply arrives during SCSI EH, but before we get a chance to NULLify the pointer - but before we return from the callback -, we assume that the code is protected from races via the CAS operation in blk_complete_request() that is called in scsi_done(). The following stacktrace shows an example for a crash resulting from the previous behavior: Unable to handle kernel pointer dereference at virtual kernel address fffffee17a672000 Oops: 0038 [#1] SMP CPU: 2 PID: 0 Comm: swapper/2 Not tainted task: 00000003f7ff5be0 ti: 00000003f3d38000 task.ti: 00000003f3d38000 Krnl PSW : 0404d00180000000 00000000001156b0 (smp_vcpu_scheduled+0x18/0x40) R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:1 PM:0 EA:3 Krnl GPRS: 000000200000007e 0000000000000000 fffffee17a671fd8 0000000300000015 ffffffff80000000 00000000005dfde8 07000003f7f80e00 000000004fa4e800 000000036ce8d8f8 000000036ce8d9c0 00000003ece8fe00 ffffffff969c9e93 00000003fffffffd 000000036ce8da10 00000000003bf134 00000003f3b07918 Krnl Code: 00000000001156a2: a7190000 lghi %r1,0 00000000001156a6: a7380015 lhi %r3,21 #00000000001156aa: e32050000008 ag %r2,0(%r5) >00000000001156b0: 482022b0 lh %r2,688(%r2) 00000000001156b4: ae123000 sigp %r1,%r2,0(%r3) 00000000001156b8: b2220020 ipm %r2 00000000001156bc: 8820001c srl %r2,28 00000000001156c0: c02700000001 xilf %r2,1 Call Trace: ([<0000000000000000>] 0x0) [<000003ff807bdb8e>] zfcp_fsf_fcp_cmnd_handler+0x3de/0x490 [zfcp] [<000003ff807be30a>] zfcp_fsf_req_complete+0x252/0x800 [zfcp] [<000003ff807c0a48>] zfcp_fsf_reqid_check+0xe8/0x190 [zfcp] [<000003ff807c194e>] zfcp_qdio_int_resp+0x66/0x188 [zfcp] [<000003ff80440c64>] qdio_kick_handler+0xdc/0x310 [qdio] [<000003ff804463d0>] __tiqdio_inbound_processing+0xf8/0xcd8 [qdio] [<0000000000141fd4>] tasklet_action+0x9c/0x170 [<0000000000141550>] __do_softirq+0xe8/0x258 [<000000000010ce0a>] do_softirq+0xba/0xc0 [<000000000014187c>] irq_exit+0xc4/0xe8 [<000000000046b526>] do_IRQ+0x146/0x1d8 [<00000000005d6a3c>] io_return+0x0/0x8 [<00000000005d6422>] vtime_stop_cpu+0x4a/0xa0 ([<0000000000000000>] 0x0) [<0000000000103d8a>] arch_cpu_idle+0xa2/0xb0 [<0000000000197f94>] cpu_startup_entry+0x13c/0x1f8 [<0000000000114782>] smp_start_secondary+0xda/0xe8 [<00000000005d6efe>] restart_int_handler+0x56/0x6c [<0000000000000000>] 0x0 Last Breaking-Event-Address: [<00000000003bf12e>] arch_spin_lock_wait+0x56/0xb0 Suggested-by:
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Kashyap Desai authored
scsi: megaraid_sas: Do not set MPI2_TYPE_CUDA for JBOD FP path for FW which does not support JBOD sequence map BugLink: http://bugs.launchpad.net/bugs/1655041 commit d5573584 upstream. Signed-off-by:
Sumit Saxena <sumit.saxena@broadcom.com> Reviewed-by:
Hannes Reinecke <hare@suse.com> Reviewed-by:
Tomas Henzl <thenzl@redhat.com> Signed-off-by:
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Kashyap Desai authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 18e1c7f6 upstream. For SRIOV enabled firmware, if there is a OCR(online controller reset) possibility driver set the convert flag to 1, which is not happening if there are outstanding commands even after 180 seconds. As driver does not set convert flag to 1 and still making the OCR to run, VF(Virtual function) driver is directly writing on to the register instead of waiting for 30 seconds. Setting convert flag to 1 will cause VF driver will wait for 30 secs before going for reset. Signed-off-by:
Kiran Kumar Kasturi <kiran-kumar.kasturi@broadcom.com> Signed-off-by:
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Maciej S. Szmigiero authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 31b5929d upstream. There is a disagreement between drivers/tty/vt/keyboard.c and drivers/input/input-leds.c with regard to what is a Scroll Lock LED trigger name: input calls it "kbd-scrolllock", but vt calls it "kbd-scrollock" (two l's). This prevents Scroll Lock LED trigger from binding to this LED by default. Since it is a scroLL Lock LED, this interface was introduced only about a year ago and in an Internet search people seem to reference this trigger only to set it to this LED let's simply rename it to "kbd-scrolllock". Also, it looks like this was supposed to be changed before this code was merged: https://lkml.org/lkml/2015/6/9/697 but it was done only on the input side. Signed-off-by:
Maciej S. Szmigiero <mail@maciej.szmigiero.name> Acked-by:
Samuel Thibault <samuel.thibault@ens-lyon.org> Signed-off-by:
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Rabin Vincent authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit af309226 upstream. If a block device is closed while iterate_bdevs() is handling it, the following NULL pointer dereference occurs because bdev->b_disk is NULL in bdev_get_queue(), which is called from blk_get_backing_dev_info() (in turn called by the mapping_cap_writeback_dirty() call in __filemap_fdatawrite_range()): BUG: unable to handle kernel NULL pointer dereference at 0000000000000508 IP: [<ffffffff81314790>] blk_get_backing_dev_info+0x10/0x20 PGD 9e62067 PUD 9ee8067 PMD 0 Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC Modules linked in: CPU: 1 PID: 2422 Comm: sync Not tainted 4.5.0-rc7+ #400 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) task: ffff880009f4d700 ti: ffff880009f5c000 task.ti: ffff880009f5c000 RIP: 0010:[<ffffffff81314790>] [<ffffffff81314790>] blk_get_backing_dev_info+0x10/0x20 RSP: 0018:ffff880009f5fe68 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88000ec17a38 RCX: ffffffff81a4e940 RDX: 7fffffffffffffff RSI: 0000000000000000 RDI: ffff88000ec176c0 RBP: ffff880009f5fe68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88000ec17860 R13: ffffffff811b25c0 R14: ffff88000ec178e0 R15: ffff88000ec17a38 FS: 00007faee505d700(0000) GS:ffff88000fb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000508 CR3: 0000000009e8a000 CR4: 00000000000006e0 Stack: ffff880009f5feb8 ffffffff8112e7f5 0000000000000000 7fffffffffffffff 0000000000000000 0000000000000000 7fffffffffffffff 0000000000000001 ffff88000ec178e0 ffff88000ec17860 ffff880009f5fec8 ffffffff8112e81f Call Trace: [<ffffffff8112e7f5>] __filemap_fdatawrite_range+0x85/0x90 [<ffffffff8112e81f>] filemap_fdatawrite+0x1f/0x30 [<ffffffff811b25d6>] fdatawrite_one_bdev+0x16/0x20 [<ffffffff811bc402>] iterate_bdevs+0xf2/0x130 [<ffffffff811b2763>] sys_sync+0x63/0x90 [<ffffffff815d4272>] entry_SYSCALL_64_fastpath+0x12/0x76 Code: 0f 1f 44 00 00 48 8b 87 f0 00 00 00 55 48 89 e5 <48> 8b 80 08 05 00 00 5d RIP [<ffffffff81314790>] blk_get_backing_dev_info+0x10/0x20 RSP <ffff880009f5fe68> CR2: 0000000000000508 ---[ end trace 2487336ceb3de62d ]--- The crash is easily reproducible by running the following command, if an msleep(100) is inserted before the call to func() in iterate_devs(): while :; do head -c1 /dev/nullb0; done > /dev/null & while :; do sync; done Fix it by holding the bd_mutex across the func() call and only calling func() if the bdev is opened. Fixes: 5c0d6b60 ("vfs: Create function for iterating over block devices") Reported-and-tested-by:
Rabin Vincent <rabinv@axis.com> Signed-off-by:
Jan Kara <jack@suse.cz> Reviewed-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Jens Axboe <axboe@fb.com> Signed-off-by:
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Alexander Usyskin authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit d5f8e166 upstream. pm_runtime_autosuspend can take synchronous or asynchronous paths, Because we are calling pm_runtime_mark_last_busy just before this most of the cases it takes the asynchronous way. However, when the FW or driver resets during already running runtime suspend, the call will result in calling to the driver's rpm callback and results in a deadlock on device_lock. The simplest fix is to replace pm_runtime_autosuspend with asynchronous pm_request_autosuspend. Signed-off-by:
Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by:
Tomas Winkler <tomas.winkler@intel.com> Signed-off-by:
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Russell Currey authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 298360af upstream. ast_get_dram_info() configures a window in order to access BMC memory. A BMC register can be configured to disallow this, and if so, causes an infinite loop in the ast driver which renders the system unusable. Fix this by erroring out if an error is detected. On powerpc systems with EEH, this leads to the device being fenced and the system continuing to operate. Signed-off-by:
Russell Currey <ruscur@russell.cc> Reviewed-by:
Joel Stanley <joel@jms.id.au> Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161215051241.20815-1-ruscur@russell.ccSigned-off-by:
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Patrik Jakobsson authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 0a97c81a upstream. Hook up drm_compat_ioctl to support 32-bit userspace on 64-bit kernels. It turns out that N2600 and N2800 comes with 64-bit enabled. We previously assumed there where no such systems out there. Signed-off-by:
Patrik Jakobsson <patrik.r.jakobsson@gmail.com> Signed-off-by:
Sean Paul <seanpaul@chromium.org> Link: http://patchwork.freedesktop.org/patch/msgid/20161101144315.2955-1-patrik.r.jakobsson@gmail.comSigned-off-by:
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Alex Deucher authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 8729675c upstream. New variant. Signed-off-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
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Michel Dänzer authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 6b16cf77 upstream. Fixes hangs in that case under some circumstances. v2: * Only use non-0 x/yorigin if the cursor is (partially) outside of the top/left edge of the total surface with AVIVO/DCE Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=1000433Signed-off-by:
Michel Dänzer <michel.daenzer@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> (v1) Signed-off-by:
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Michel Dänzer authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit dcab0fa6 upstream. The cursor size also affects the register programming. Signed-off-by:
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Ben Skeggs authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 5b3800a6 upstream. DPAUX registers moved on Kepler, these chipsets were still using the Fermi implementation for some reason. This fixes detection of hotplug/sink IRQs on DP connectors. Signed-off-by:
Ben Skeggs <bskeggs@redhat.com> Signed-off-by:
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Ben Skeggs authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit b27add13 upstream. This avoids an issue that occurs when we're attempting to preempt multiple channels simultaneously. HW seems to ignore preempt requests while it's still processing a previous one, which, well, makes sense. Fixes random "fifo: SCHED_ERROR 0d []" + GPCCS page faults during parallel piglit runs on (at least) GM107. Signed-off-by:
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Ben Skeggs authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit f4e65efc upstream. Signed-off-by:
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Ben Skeggs authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 5dc7f4aa upstream. Signed-off-by:
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Ben Skeggs authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 768e8477 upstream. Signed-off-by:
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Hans de Goede authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 6276e53f upstream. The HP Pavilion dv6 has a non-working acpi_video0 backlight interface and an intel_backlight interface which works fine. Add a force_native quirk for it so that the non-working acpi_video0 interface does not get registered. Note that there are quite a few HP Pavilion dv6 variants, some woth ATI and some with NVIDIA hybrid gfx, both seem to need this quirk to have working backlight control. There are also some versions with only Intel integrated gfx, these may not need this quirk, but it should not hurt there. Link: https://bugzilla.redhat.com/show_bug.cgi?id=1204476 Link: https://bugs.launchpad.net/ubuntu/+source/linux-lts-trusty/+bug/1416940Signed-off-by:
Hans de Goede <hdegoede@redhat.com> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by:
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Hans de Goede authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 350fa038 upstream. The Dell XPS 17 L702X has a non-working acpi_video0 backlight interface and an intel_backlight interface which works fine. Add a force_native quirk for it so that the non-working acpi_video0 interface does not get registered. Note that there also is an issue with the brightnesskeys on this laptop, they do not generate key-press events in anyway. That is not solved by this patch. Link: https://bugzilla.redhat.com/show_bug.cgi?id=1123661Signed-off-by:
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Ian Abbott authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 857a6610 upstream. Commit 0557344e ("staging: comedi: ni_mio_common: fix local var for 32-bit read") changed the type of local variable `d` from `unsigned short` to `unsigned int` to fix a bug introduced in commit 9c340ac9 ("staging: comedi: ni_stc.h: add read/write callbacks to struct ni_private") when reading AI data for NI PCI-6110 and PCI-6111 cards. Unfortunately, other parts of the function rely on the variable being `unsigned short` when an offset value in local variable `signbits` is added to `d` before writing the value to the `data` array: d += signbits; data[n] = d; The `signbits` variable will be non-zero in bipolar mode, and is used to convert the hardware's 2's complement, 16-bit numbers to Comedi's straight binary sample format (with 0 representing the most negative voltage). This breaks because `d` is now 32 bits wide instead of 16 bits wide, so after the addition of `signbits`, `data[n]` ends up being set to values above 65536 for negative voltages. This affects all supported "E series" cards except PCI-6143 (and PXI-6143). Fix it by ANDing the value written to the `data[n]` with the mask 0xffff. Fixes: 0557344e ("staging: comedi: ni_mio_common: fix local var for 32-bit read") Signed-off-by:
Ian Abbott <abbotti@mev.co.uk> Signed-off-by:
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Ian Abbott authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 655c4d44 upstream. For NI M Series cards, the Comedi `insn_read` handler for the AI subdevice is broken due to ANDing the value read from the AI FIFO data register with an incorrect mask. The incorrect mask clears all but the most significant bit of the sample data. It should preserve all the sample data bits. Correct it. Fixes: 817144ae ("staging: comedi: ni_mio_common: remove unnecessary use of 'board->adbits'") Signed-off-by:
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Krzysztof Kozlowski authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit f37fabb8 upstream. In the critical sysfs entry the thermal hwmon was returning wrong temperature to the user-space. It was reporting the temperature of the first trip point instead of the temperature of critical trip point. For example: /sys/class/hwmon/hwmon0/temp1_crit:50000 /sys/class/thermal/thermal_zone0/trip_point_0_temp:50000 /sys/class/thermal/thermal_zone0/trip_point_0_type:active /sys/class/thermal/thermal_zone0/trip_point_3_temp:120000 /sys/class/thermal/thermal_zone0/trip_point_3_type:critical Since commit e68b16ab ("thermal: add hwmon sysfs I/F") the driver have been registering a sysfs entry if get_crit_temp() callback was provided. However when accessed, it was calling get_trip_temp() instead of the get_crit_temp(). Fixes: e68b16ab ("thermal: add hwmon sysfs I/F") Signed-off-by:
Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by:
Zhang Rui <rui.zhang@intel.com> Signed-off-by:
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Boris Brezillon authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 68af4fa8 upstream. bcm2835_pll_divider_off() is resetting the divider field in the A2W reg to zero when disabling the clock. Make sure we preserve this value by reading the previous a2w_reg value first and ORing the result with A2W_PLL_CHANNEL_DISABLE. Signed-off-by:
Boris Brezillon <boris.brezillon@free-electrons.com> Fixes: 41691b88 ("clk: bcm2835: Add support for programming the audio domain clocks") Reviewed-by:
Eric Anholt <eric@anholt.net> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org> Signed-off-by:
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Thomas Gleixner authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 9c164572 upstream. The clocksource delta to nanoseconds conversion is using signed math, but the delta is unsigned. This makes the conversion space smaller than necessary and in case of a multiplication overflow the conversion can become negative. The conversion is done with scaled math: s64 nsec_delta = ((s64)clkdelta * clk->mult) >> clk->shift; Shifting a signed integer right obvioulsy preserves the sign, which has interesting consequences: - Time jumps backwards - __iter_div_u64_rem() which is used in one of the calling code pathes will take forever to piecewise calculate the seconds/nanoseconds part. This has been reported by several people with different scenarios: David observed that when stopping a VM with a debugger: "It was essentially the stopped by debugger case. I forget exactly why, but the guest was being explicitly stopped from outside, it wasn't just scheduling lag. I think it was something in the vicinity of 10 minutes stopped." When lifting the stop the machine went dead. The stopped by debugger case is not really interesting, but nevertheless it would be a good thing not to die completely. But this was also observed on a live system by Liav: "When the OS is too overloaded, delta will get a high enough value for the msb of the sum delta * tkr->mult + tkr->xtime_nsec to be set, and so after the shift the nsec variable will gain a value similar to 0xffffffffff000000." Unfortunately this has been reintroduced recently with commit 6bd58f09 ("time: Add cycles to nanoseconds translation"). It had been fixed a year ago already in commit 35a4933a ("time: Avoid signed overflow in timekeeping_get_ns()"). Though it's not surprising that the issue has been reintroduced because the function itself and the whole call chain uses s64 for the result and the propagation of it. The change in this recent commit is subtle: s64 nsec; - nsec = (d * m + n) >> s: + nsec = d * m + n; + nsec >>= s; d being type of cycle_t adds another level of obfuscation. This wouldn't have happened if the previous change to unsigned computation would have made the 'nsec' variable u64 right away and a follow up patch had cleaned up the whole call chain. There have been patches submitted which basically did a revert of the above patch leaving everything else unchanged as signed. Back to square one. This spawned a admittedly pointless discussion about potential users which rely on the unsigned behaviour until someone pointed out that it had been fixed before. The changelogs of said patches added further confusion as they made finally false claims about the consequences for eventual users which expect signed results. Despite delta being cycle_t, aka. u64, it's very well possible to hand in a signed negative value and the signed computation will happily return the correct result. But nobody actually sat down and analyzed the code which was added as user after the propably unintended signed conversion. Though in sensitive code like this it's better to analyze it proper and make sure that nothing relies on this than hunting the subtle wreckage half a year later. After analyzing all call chains it stands that no caller can hand in a negative value (which actually would work due to the s64 cast) and rely on the signed math to do the right thing. Change the conversion function to unsigned math. The conversion of all call chains is done in a follow up patch. This solves the starvation issue, which was caused by the negative result, but it does not solve the underlying problem. It merily procrastinates it. When the timekeeper update is deferred long enough that the unsigned multiplication overflows, then time going backwards is observable again. It does neither solve the issue of clocksources with a small counter width which will wrap around possibly several times and cause random time stamps to be generated. But those are usually not found on systems used for virtualization, so this is likely a non issue. I took the liberty to claim authorship for this simply because analyzing all callsites and writing the changelog took substantially more time than just making the simple s/s64/u64/ change and ignore the rest. Fixes: 6bd58f09 ("time: Add cycles to nanoseconds translation") Reported-by:
David Gibson <david@gibson.dropbear.id.au> Reported-by:
Liav Rehana <liavr@mellanox.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Reviewed-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Parit Bhargava <prarit@redhat.com> Cc: Laurent Vivier <lvivier@redhat.com> Cc: "Christopher S. Hall" <christopher.s.hall@intel.com> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Richard Cochran <richardcochran@gmail.com> Cc: John Stultz <john.stultz@linaro.org> Link: http://lkml.kernel.org/r/20161208204228.688545601@linutronix.deSigned-off-by:
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Linus Walleij authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 295070e9 upstream. The regulator has never been properly enabled, it has been dormant all the time. It's strange that MMC was working at all, but it likely worked by the signals going through the levelshifter and reaching the card anyways. Fixes: 3615a34e ("regulator: add STw481x VMMC driver") Signed-off-by:
Linus Walleij <linus.walleij@linaro.org> Signed-off-by:
Mark Brown <broonie@kernel.org> Signed-off-by:
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Adrian Hunter authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 61e53bd0 upstream. Clearing the tuning bits should reset the tuning circuit. However there is more to do. Reset the command and data lines for good measure, and then for eMMC ensure the card is not still trying to process a tuning command by sending a stop command. Note the JEDEC eMMC specification says the stop command (CMD12) can be used to stop a tuning command (CMD21) whereas the SD specification is silent on the subject with respect to the SD tuning command (CMD19). Considering that CMD12 is not a valid SDIO command, the stop command is sent only when the tuning command is CMD21 i.e. for eMMC. That addresses cases seen so far which have been on eMMC. Note that this replaces the commit fe5fb2e3 ("mmc: sdhci: Reset cmd and data circuits after tuning failure") which is being reverted for v4.9+. Signed-off-by:
Adrian Hunter <adrian.hunter@intel.com> Tested-by:
Dan O'Donovan <dan@emutex.com> Signed-off-by:
Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by:
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Vittorio Gambaletta (VittGam) authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 79e57dd1 upstream. The active_high LED of my Wistron DNMA-92 is still being recognized as active_low on 4.7.6 mainline. When I was preparing my former commit 0f9edcdd ("ath9k: Fix LED polarity for some Mini PCI AR9220 MB92 cards.") to fix that I must have somehow messed up with testing, because I tested the final version of that patch before sending it, and it was apparently working; but now it is not working on 4.7.6 mainline. I initially added the PCI_DEVICE_SUB section for 0x0029/0x2096 above the PCI_VDEVICE section for 0x0029; but then I moved the former below the latter after seeing how 0x002A sections were sorted in the file. This turned out to be wrong: if a generic PCI_VDEVICE entry (that has both subvendor and subdevice IDs set to PCI_ANY_ID) is put before a more specific one (PCI_DEVICE_SUB), then the generic PCI_VDEVICE entry will match first and will be used. With this patch, 0x0029/0x2096 has finally got active_high LED on 4.7.6. While I'm at it, let's fix 0x002A too by also moving its generic definition below its specific ones. Fixes: 0f9edcdd ("ath9k: Fix LED polarity for some Mini PCI AR9220 MB92 cards.") Signed-off-by:
Vittorio Gambaletta <linuxbugs@vittgam.net> [kvalo@qca.qualcomm.com: improve the commit log based on email discussions] Signed-off-by:
Kalle Valo <kvalo@qca.qualcomm.com> Signed-off-by:
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Johannes Berg authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit e6f462df upstream. When mac80211 abandons an association attempt, it may free all the data structures, but inform cfg80211 and userspace about it only by sending the deauth frame it received, in which case cfg80211 has no link to the BSS struct that was used and will not cfg80211_unhold_bss() it. Fix this by providing a way to inform cfg80211 of this with the BSS entry passed, so that it can clean up properly, and use this ability in the appropriate places in mac80211. This isn't ideal: some code is more or less duplicated and tracing is missing. However, it's a fairly small change and it's thus easier to backport - cleanups can come later. Signed-off-by:
Johannes Berg <johannes.berg@intel.com> Signed-off-by:
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Larry Finger authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit ba9f93f8 upstream. In commit a5ffbe0a ("rtlwifi: Fix scheduling while atomic bug") and commit a269913c ("rtlwifi: Rework rtl_lps_leave() and rtl_lps_enter() to use work queue"), an error was introduced in the power-save routines due to the fact that leaving PS was delayed by the use of a work queue. This problem is fixed by detecting if the enter or leave routines are in interrupt mode. If so, the workqueue is used to place the request. If in normal mode, the enter or leave routines are called directly. Fixes: a269913c ("rtlwifi: Rework rtl_lps_leave() and rtl_lps_enter() to use work queue") Reported-by:
Ping-Ke Shih <pkshih@realtek.com> Signed-off-by:
Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by:
Kalle Valo <kvalo@codeaurora.org> Signed-off-by:
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Larry Finger authored
BugLink: http://bugs.launchpad.net/bugs/1655041 commit 8052d724 upstream. When there is a CRC error in the SPROM read from the device, the code attempts to handle a fallback SPROM. When this also fails, the driver returns zero rather than an error code. Signed-off-by:
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Luis Henriques authored
Ignore: yes Signed-off-by:
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- 18 Jan, 2017 5 commits
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Thadeu Lima de Souza Cascardo authored
Signed-off-by:Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
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Timo Aaltonen authored
BugLink: http://bugs.launchpad.net/bugs/1657353 Not validating the mode rate against max. link rate results in not pruning invalid modes. For e.g, a HBR2 5.4 Gbps 2-lane configuration does not support 4k@60Hz. But, we do not reject this mode. So, make use of the helpers in intel_dp to validate mode data rate against max. link data rate of a configuration. v3: Renamed local variables again for consistency (Manasi) v2: Renamed mode data rate local variable to be more explanatory. Signed-off-by:
Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1479243546-17189-1-git-send-email-dhinakaran.pandiyan@intel.comSigned-off-by:
Ville Syrjälä <ville.syrjala@linux.intel.com> (backported from drm-intel-next commit 22a2c8e0) Signed-off-by:
Timo Aaltonen <timo.aaltonen@canonical.com> Acked-by:
Stefan Bader <stefan.bader@canonical.com> Signed-off-by:
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Timo Aaltonen authored
BugLink: http://bugs.launchpad.net/bugs/1657353 We store DP link rates as link clock frequencies in kHz, just like all other clock values. But, DP link rates in the DP Spec. are expressed in Gbps/lane, which seems to have led to some confusion. E.g., for HBR2 Max. data rate = 5.4 Gbps/lane x 4 lane x 8/10 x 1/8 = 2160000 kBps where, 8/10 is for channel encoding and 1/8 is for bit to Byte conversion Using link clock frequency, like we do Max. data rate = 540000 kHz * 4 lanes = 2160000 kSymbols/s Because, each symbol has 8 bit of data, this is 2160000 kBps and there is no need to account for channel encoding here. But, currently we do 540000 kHz * 4 lanes * (8/10) = 1728000 kBps Similarly, while computing the required link bandwidth for a mode, there is a mysterious 1/10 term. This should simply be pixel_clock kHz * (bpp/8) to give the final result in kBps v2: Changed to DIV_ROUND_UP() and comment changes (Ville) Signed-off-by:
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Omar Sandoval authored
BugLink: https://bugs.launchpad.net/bugs/1657281 Commit 0809e3ac ("block: fix plug list flushing for nomerge queues") updated blk_mq_make_request() to set request_count even when blk_queue_nomerges() returns true. However, blk_mq_make_request() only does limited plugging and doesn't use request_count; blk_sq_make_request() is the one that should have been fixed. Do that and get rid of the unnecessary work in the mq version. Fixes: 0809e3ac ("block: fix plug list flushing for nomerge queues") Signed-off-by:
Omar Sandoval <osandov@fb.com> Reviewed-by:
Ming Lei <tom.leiming@gmail.com> Reviewed-by:
Jeff Moyer <jmoyer@redhat.com> Signed-off-by:
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Thadeu Lima de Souza Cascardo authored
Ignore: yes Signed-off-by:
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- 16 Jan, 2017 2 commits
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Thadeu Lima de Souza Cascardo authored
Signed-off-by: -
Dan Streetman authored
BugLink: http://bugs.launchpad.net/bugs/1656381 Revert the main part of commit: af42b8d1 ("xen: fix MSI setup and teardown for PV on HVM guests") That commit introduced reading the pci device's msi message data to see if a pirq was previously configured for the device's msi/msix, and re-use that pirq. At the time, that was the correct behavior. However, a later change to Qemu caused it to call into the Xen hypervisor to unmap all pirqs for a pci device, when the pci device disables its MSI/MSIX vectors; specifically the Qemu commit: c976437c7dba9c7444fb41df45468968aaa326ad ("qemu-xen: free all the pirqs for msi/msix when driver unload") Once Qemu added this pirq unmapping, it was no longer correct for the kernel to re-use the pirq number cached in the pci device msi message data. All Qemu releases since 2.1.0 contain the patch that unmaps the pirqs when the pci device disables its MSI/MSIX vectors. This bug is causing failures to initialize multiple NVMe controllers under Xen, because the NVMe driver sets up a single MSIX vector for each controller (concurrently), and then after using that to talk to the controller for some configuration data, it disables the single MSIX vector and re-configures all the MSIX vectors it needs. So the MSIX setup code tries to re-use the cached pirq from the first vector for each controller, but the hypervisor has already given away that pirq to another controller, and its initialization fails. This is discussed in more detail at: https://lists.xen.org/archives/html/xen-devel/2017-01/msg00447.html Fixes: af42b8d1 ("xen: fix MSI setup and teardown for PV on HVM guests") Signed-off-by:
Dan Streetman <dan.streetman@canonical.com> Acked-by:
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