UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity
OpenCloudOS-Kernel/drivers/s390/cio
History
Farhan Ali cea5dde42a vfio-ccw: Do not call flush_workqueue while holding the spinlock 
Currently we call flush_workqueue while holding the subchannel
spinlock. But flush_workqueue function can go to sleep, so
do not call the function while holding the spinlock.

Fixes the following bug:

[  285.203430] BUG: scheduling while atomic: bash/14193/0x00000002
[  285.203434] INFO: lockdep is turned off.
....
[  285.203485] Preemption disabled at:
[  285.203488] [<000003ff80243e5c>] vfio_ccw_sch_quiesce+0xbc/0x120 [vfio_ccw]
[  285.203496] CPU: 7 PID: 14193 Comm: bash Tainted: G        W
....
[  285.203504] Call Trace:
[  285.203510] ([<0000000000113772>] show_stack+0x82/0xd0)
[  285.203514]  [<0000000000b7a102>] dump_stack+0x92/0xd0
[  285.203518]  [<000000000017b8be>] __schedule_bug+0xde/0xf8
[  285.203524]  [<0000000000b95b5a>] __schedule+0x7a/0xc38
[  285.203528]  [<0000000000b9678a>] schedule+0x72/0xb0
[  285.203533]  [<0000000000b9bfbc>] schedule_timeout+0x34/0x528
[  285.203538]  [<0000000000b97608>] wait_for_common+0x118/0x1b0
[  285.203544]  [<0000000000166d6a>] flush_workqueue+0x182/0x548
[  285.203550]  [<000003ff80243e6e>] vfio_ccw_sch_quiesce+0xce/0x120 [vfio_ccw]
[  285.203556]  [<000003ff80245278>] vfio_ccw_mdev_reset+0x38/0x70 [vfio_ccw]
[  285.203562]  [<000003ff802458b0>] vfio_ccw_mdev_remove+0x40/0x78 [vfio_ccw]
[  285.203567]  [<000003ff801a499c>] mdev_device_remove_ops+0x3c/0x80 [mdev]
[  285.203573]  [<000003ff801a4d5c>] mdev_device_remove+0xc4/0x130 [mdev]
[  285.203578]  [<000003ff801a5074>] remove_store+0x6c/0xa8 [mdev]
[  285.203582]  [<000000000046f494>] kernfs_fop_write+0x14c/0x1f8
[  285.203588]  [<00000000003c1530>] __vfs_write+0x38/0x1a8
[  285.203593]  [<00000000003c187c>] vfs_write+0xb4/0x198
[  285.203597]  [<00000000003c1af2>] ksys_write+0x5a/0xb0
[  285.203601]  [<0000000000b9e270>] system_call+0xdc/0x2d8

Signed-off-by: Farhan Ali <alifm@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Message-Id: <626bab8bb2958ae132452e1ddaf1b20882ad5a9d.1554756534.git.alifm@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
 		2019-04-24 14:18:51 +02:00
..
Makefile vfio-ccw: add handling for async channel instructions 2019-04-24 14:18:51 +02:00
airq.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blacklist.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blacklist.h s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
ccwgroup.c s390/ccwgroup: add get_ccwgroupdev_by_busid() 2018-10-08 09:09:59 +02:00
ccwreq.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
chp.c s390/cio: ensure that a chpid is registered only once 2018-07-17 07:27:51 +02:00
chp.h s390/chsc: query utility strings via fmt3 channel path descriptor 2018-03-26 16:13:16 +02:00
chsc.c s390 update with improvements and bug fixes for 5.1-rc2 2019-03-28 08:35:32 -07:00
chsc.h s390/cio: add function chsc_sgib() 2019-02-05 14:29:23 +01:00
chsc_sch.c compat: Move compat_timespec/ timeval to compat_time.h 2018-04-19 13:29:54 +02:00
chsc_sch.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cio.c s390/css: reduce stsch calls 2018-07-17 07:27:55 +02:00
cio.h s390: cio: fix cio_irb declaration 2019-04-10 17:48:33 +02:00
cio_debug.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
cmf.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
crw.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
css.c s390/css: reduce stsch calls 2018-07-17 07:27:55 +02:00
css.h s390/css: reduce stsch calls 2018-07-17 07:27:55 +02:00
device.c s390/cio: fix unbind of io_subchannel_driver 2018-03-26 16:13:06 +02:00
device.h s390/cio: Convert timers to use timer_setup() 2017-11-14 11:01:36 +01:00
device_fsm.c s390/cio: clear timer when terminating driver I/O 2018-02-22 10:09:27 +01:00
device_id.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
device_ops.c s390/cio: add helper to query utility strings per given ccw device 2018-05-23 08:06:56 +02:00
device_pgid.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
device_status.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
eadm_sch.c s390: cio: add SPDX identifiers to the remaining files 2017-11-24 14:28:41 +01:00
eadm_sch.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fcx.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
idset.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
idset.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
io_sch.h s390/cio: fix return code after missing interrupt 2018-02-22 10:09:25 +01:00
ioasm.c s390/cio: export hsch to modules 2019-04-24 14:18:51 +02:00
ioasm.h s390: assume diag308 set always works 2018-04-10 07:38:59 +02:00
isc.c s390: cio: add SPDX identifiers to the remaining files 2017-11-24 14:28:41 +01:00
itcw.c s390/cio: fix kernel-doc usage 2018-02-05 07:34:52 +01:00
orb.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
qdio.h s390/qdio: eliminate queue's last_move cursor 2019-04-10 17:47:26 +02:00
qdio_debug.c s390/qdio: eliminate queue's last_move cursor 2019-04-10 17:47:26 +02:00
qdio_debug.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
qdio_main.c s390/qdio: consolidate index tracking for queue scan 2019-04-18 10:10:32 +02:00
qdio_setup.c s390/qdio: clean up pci_out_supported() 2019-03-29 07:23:49 +01:00
qdio_thinint.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
scm.c s390: cio: add SPDX identifiers to the remaining files 2017-11-24 14:28:41 +01:00
trace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace.h s390 cio: Rewrite trace point class s390_class_schib 2018-07-23 13:49:56 +02:00
vfio_ccw_async.c vfio-ccw: add handling for async channel instructions 2019-04-24 14:18:51 +02:00
vfio_ccw_cp.c vfio-ccw: make it safe to access channel programs 2019-04-24 14:18:51 +02:00
vfio_ccw_cp.h vfio-ccw: make it safe to access channel programs 2019-04-24 14:18:51 +02:00
vfio_ccw_drv.c vfio-ccw: Do not call flush_workqueue while holding the spinlock 2019-04-24 14:18:51 +02:00
vfio_ccw_fsm.c vfio-ccw: add handling for async channel instructions 2019-04-24 14:18:51 +02:00
vfio_ccw_ops.c vfio-ccw: add handling for async channel instructions 2019-04-24 14:18:51 +02:00
vfio_ccw_private.h vfio-ccw: add handling for async channel instructions 2019-04-24 14:18:51 +02:00
vfio_ccw_trace.h vfio: ccw: add tracepoints for interesting error paths 2018-05-29 09:27:42 +02:00