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Ming Lei aa0818c6ee virtio_blk: fix race between start and stop queue 
When there isn't enough vring descriptor for adding to vq,
blk-mq will be put as stopped state until some of pending
descriptors are completed & freed.

Unfortunately, the vq's interrupt may come just before
blk-mq's BLK_MQ_S_STOPPED flag is set, so the blk-mq will
still be kept as stopped even though lots of descriptors
are completed and freed in the interrupt handler. The worst
case is that all pending descriptors are freed in the
interrupt handler, and the queue is kept as stopped forever.

This patch fixes the problem by starting/stopping blk-mq
with holding vq_lock.

Cc: Jens Axboe <axboe@kernel.dk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>

Conflicts:
	drivers/block/virtio_blk.c
 		2014-05-27 08:41:10 -06:00
..
aoe mm: close PageTail race 2014-03-04 07:55:47 -08:00
drbd Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-04-12 14:49:50 -07:00
mtip32xx Merge branch 'for-3.15/drivers' of git://git.kernel.dk/linux-block 2014-04-01 19:43:53 -07:00
paride drivers/block/paride/pg.c: underflow bug in pg_write() 2014-01-21 20:16:56 -08:00
rsxx block: Convert bio_for_each_segment() to bvec_iter 2013-11-23 22:33:49 -08:00
xen-blkback xen-blkback: init persistent_purge_work work_struct 2014-02-11 20:34:03 -07:00
zram zram: support REQ_DISCARD 2014-04-07 16:36:02 -07:00
DAC960.c DAC960: remove sleep_on usage 2014-03-13 14:56:38 -06:00
DAC960.h
…
Kconfig zram: promote zram from staging 2014-01-30 16:56:55 -08:00
Makefile zram: promote zram from staging 2014-01-30 16:56:55 -08:00
amiflop.c tree-wide: use reinit_completion instead of INIT_COMPLETION 2013-11-15 09:32:21 +09:00
ataflop.c ataflop: fix sleep_on races 2014-03-13 14:56:38 -06:00
brd.c block: Convert bio_for_each_segment() to bvec_iter 2013-11-23 22:33:49 -08:00
cciss.c cciss: Fallback to MSI rather than to INTx if MSI-X failed 2014-03-13 14:56:39 -06:00
cciss.h
…
cciss_cmd.h
…
cciss_scsi.c cciss: switch to ->show_info() 2013-04-09 14:13:19 -04:00
cciss_scsi.h
…
cpqarray.c cpqarray: fix info leak in ida_locked_ioctl() 2013-09-24 17:00:26 -07:00
cpqarray.h
…
cryptoloop.c move linux/loop.h to drivers/block 2013-06-29 12:46:45 +04:00
floppy.c floppy: don't write kernel-only members to FDRAWCMD ioctl output 2014-05-05 07:46:56 -07:00
hd.c
…
ida_cmd.h
…
ida_ioctl.h
…
loop.c drivers/block/loop.c: ratelimit error messages 2014-04-08 14:44:35 -06:00
loop.h move linux/loop.h to drivers/block 2013-06-29 12:46:45 +04:00
mg_disk.c mg_disk: Spelling s/finised/finished/ 2014-01-21 20:34:58 -08:00
nbd.c switch nbd to sockfd_lookup/sockfd_put 2014-04-01 23:19:10 -04:00
null_blk.c null_blk: use blk_complete_request and blk_mq_complete_request 2014-02-10 09:27:31 -07:00
nvme-core.c Merge git://git.infradead.org/users/willy/linux-nvme 2014-04-11 16:45:59 -07:00
nvme-scsi.c NVMe: Retry failed commands with non-fatal errors 2014-04-10 17:11:59 -04:00
osdblk.c block: replace strict_strtoul() with kstrtoul() 2013-09-11 15:56:56 -07:00
pktcdvd.c pktcdvd: fix error return code 2014-01-03 10:05:34 +01:00
ps3disk.c block: Kill bio_segments()/bi_vcnt usage 2013-11-23 22:33:51 -08:00
ps3vram.c block: Convert bio_for_each_segment() to bvec_iter 2013-11-23 22:33:49 -08:00
rbd.c rbd: prefix rbd writes with CEPH_OSD_OP_SETALLOCHINT osd op 2014-04-03 10:33:52 +08:00
rbd_types.h rbd: get rid of RBD_MAX_SEG_NAME_LEN 2012-12-17 08:37:29 -06:00
skd_main.c skd: Use pci_enable_msix_range() instead of pci_enable_msix() 2014-02-21 15:45:26 -08:00
skd_s1120.h skd: fix formatting in skd_s1120.h 2013-11-08 09:10:30 -07:00
smart1,2.h
…
sunvdc.c sunvdc: Fix off-by-one in generic_request(). 2013-02-14 11:49:01 -08:00
swim.c drivers/block/swim.c: remove unnecessary platform_set_drvdata() 2013-09-11 15:56:59 -07:00
swim3.c swim3: fix interruptible_sleep_on race 2014-03-13 14:56:38 -06:00
swim_asm.S
…
sx8.c drivers/block/sx8.c: remove unnecessary pci_set_drvdata() 2014-01-21 20:16:56 -08:00
umem.c block: Convert drivers to immutable biovecs 2013-11-23 22:33:51 -08:00
umem.h
…
virtio_blk.c virtio_blk: fix race between start and stop queue 2014-05-27 08:41:10 -06:00
xen-blkfront.c Merge branch 'stable/for-jens-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip into for-linus 2014-02-10 12:52:34 -07:00
xsysace.c xilinx systemace: Fix sparse warnings 2013-07-10 07:47:12 +02:00
z2ram.c block/z2ram: Remove duplicate external declarations 2013-11-26 11:09:10 +01:00