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Andrey Vagin 8515736604 block: fix memory leaks on unplugging block device 
All objects, which are allocated in blk_mq_register_disk, must be
released in blk_mq_unregister_disk.

I use a KVM virtual machine and virtio disk to reproduce this issue.

kmemleak: 18 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
$ cat /sys/kernel/debug/kmemleak | head -n 30
unreferenced object 0xffff8800b6636150 (size 8):
  comm "kworker/0:2", pid 65, jiffies 4294809903 (age 86.358s)
  hex dump (first 8 bytes):
    76 69 72 74 69 6f 34 00                          virtio4.
  backtrace:
    [<ffffffff8165d41e>] kmemleak_alloc+0x4e/0xb0
    [<ffffffff8118cfc5>] __kmalloc_track_caller+0xf5/0x260
    [<ffffffff81155b11>] kstrdup+0x31/0x60
    [<ffffffff812242be>] sysfs_new_dirent+0x2e/0x140
    [<ffffffff81224678>] create_dir+0x38/0xe0
    [<ffffffff812249e3>] sysfs_create_dir_ns+0x73/0xc0
    [<ffffffff8130dfa9>] kobject_add_internal+0xc9/0x340
    [<ffffffff8130e535>] kobject_add+0x65/0xb0
    [<ffffffff813f34f8>] device_add+0x128/0x660
    [<ffffffff813f3a4a>] device_register+0x1a/0x20
    [<ffffffff813ae6f8>] register_virtio_device+0x98/0xe0
    [<ffffffff813b0cce>] virtio_pci_probe+0x12e/0x1c0
    [<ffffffff81340675>] local_pci_probe+0x45/0xa0
    [<ffffffff81341a51>] pci_device_probe+0x121/0x130
    [<ffffffff813f67f7>] driver_probe_device+0x87/0x390
    [<ffffffff813f6b3b>] __device_attach+0x3b/0x40
unreferenced object 0xffff8800b65aa1d8 (size 144):

Fixes: 320ae51fee (blk-mq: new multi-queue block IO queueing mechanism)
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2013-12-06 09:18:02 -07:00
..
partitions block/partitions/efi.c: fix bound check 2013-11-21 16:42:27 -08:00
blk-cgroup.c Merge branch 'for-3.12/core' of git://git.kernel.dk/linux-block 2013-09-22 15:00:11 -07:00
blk-cgroup.h Update of blkg_stat and blkg_rwstat may happen in bh context. 2013-11-20 15:33:04 -07:00
blk-core.c Merge branch 'blk-mq/core' into for-3.13/core 2013-11-08 09:08:12 -07:00
blk-exec.c blk-mq: new multi-queue block IO queueing mechanism 2013-10-25 11:56:00 +01:00
blk-flush.c block: submit_bio_wait() conversions 2013-11-24 16:33:41 -07:00
blk-integrity.c
blk-ioc.c block: cleanup removing dependency on bootmem headers 2013-11-08 19:43:48 -07:00
blk-iopoll.c block: Replace __get_cpu_var uses 2013-11-08 08:59:58 -07:00
blk-lib.c block: Do not call sector_div() with a 64-bit divisor 2013-11-08 09:04:46 -07:00
blk-map.c
blk-merge.c blk-mq: don't disallow request merges for req->special being set 2013-10-29 12:11:47 -06:00
blk-mq-cpu.c blk-mq: remove newly added instances of __cpuinit 2013-11-14 08:26:02 -07:00
blk-mq-cpumap.c blk-mq: new multi-queue block IO queueing mechanism 2013-10-25 11:56:00 +01:00
blk-mq-sysfs.c block: fix memory leaks on unplugging block device 2013-12-06 09:18:02 -07:00
blk-mq-tag.c blk-mq: new multi-queue block IO queueing mechanism 2013-10-25 11:56:00 +01:00
blk-mq-tag.h blk-mq: new multi-queue block IO queueing mechanism 2013-10-25 11:56:00 +01:00
blk-mq.c blk-mq: fix use-after-free of request 2013-12-05 10:50:39 -07:00
blk-mq.h blk-mq: new multi-queue block IO queueing mechanism 2013-10-25 11:56:00 +01:00
blk-settings.c Merge branch 'for-3.13/core' of git://git.kernel.dk/linux-block 2013-11-14 12:08:14 +09:00
blk-softirq.c kernel: remove CONFIG_USE_GENERIC_SMP_HELPERS 2013-11-15 09:32:22 +09:00
blk-sysfs.c kernel: remove CONFIG_USE_GENERIC_SMP_HELPERS 2013-11-15 09:32:22 +09:00
blk-tag.c
blk-throttle.c block: Use u64_stats_init() to initialize seqcounts 2013-11-13 13:54:08 +01:00
blk-timeout.c Merge branch 'blk-mq/core' into for-3.13/core 2013-11-08 09:08:12 -07:00
blk.h blk-mq: new multi-queue block IO queueing mechanism 2013-10-25 11:56:00 +01:00
bsg-lib.c
bsg.c
cfq-iosched.c block: Use u64_stats_init() to initialize seqcounts 2013-11-13 13:54:08 +01:00
cmdline-parser.c
compat_ioctl.c
deadline-iosched.c
elevator.c elevator: acquire q->sysfs_lock in elevator_change() 2013-11-08 09:00:13 -07:00
genhd.c
ioctl.c block: replace IS_ERR and PTR_ERR with PTR_ERR_OR_ZERO 2013-11-08 09:05:31 -07:00
Kconfig block: change config option name for cmdline partition parsing 2013-09-30 14:31:02 -07:00
Kconfig.iosched
Makefile blk-mq: new multi-queue block IO queueing mechanism 2013-10-25 11:56:00 +01:00
noop-iosched.c
partition-generic.c
scsi_ioctl.c block: Use rw_copy_check_uvector() 2013-11-08 09:02:14 -07:00