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| author | Bart Van Assche <bart.vanassche@sandisk.com> | 2016-09-22 23:20:54 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2016-09-27 02:58:42 +0200 |
| commit | 8d58881b995904bf8b150dae69be0829f832e7be (patch) | |
| tree | 38bb289ed3d1fa2912d9b7b47b22330affc66b18 /drivers/scsi/scsi.c | |
| parent | scsi: sas: remove is_sas_attached() (diff) | |
| download | linux-8d58881b995904bf8b150dae69be0829f832e7be.tar.xz linux-8d58881b995904bf8b150dae69be0829f832e7be.zip | |
scsi: Avoid that toggling use_blk_mq triggers a memory leak
This patch avoids that the following memory leak is triggered if
use_blk_mq is disabled after a SCSI host has been allocated by the
ib_srp driver and before the same SCSI host is freed:
unreferenced object 0xffff8803a168c568 (size 256):
backtrace:
[<ffffffff81620c95>] kmemleak_alloc+0x45/0xa0
[<ffffffff811bb104>] __kmalloc_node+0x1e4/0x400
[<ffffffff81309fe4>] blk_mq_alloc_tag_set+0xb4/0x230
[<ffffffff814731b7>] scsi_mq_setup_tags+0xc7/0xd0
[<ffffffff81469c26>] scsi_add_host_with_dma+0x216/0x2d0
[<ffffffffa064bef5>] srp_create_target+0xe55/0x13d0 [ib_srp]
[<ffffffff8143ce23>] dev_attr_store+0x13/0x20
[<ffffffff8125f030>] sysfs_kf_write+0x40/0x50
[<ffffffff8125e397>] kernfs_fop_write+0x137/0x1c0
[<ffffffff811d8c13>] __vfs_write+0x23/0x140
[<ffffffff811d92e0>] vfs_write+0xb0/0x190
[<ffffffff811da5b4>] SyS_write+0x44/0xa0
[<ffffffff8162c8a5>] entry_SYSCALL_64_fastpath+0x18/0xa8
Fixes: 9aa9cc4221f5 ("scsi: remove the disable_blk_mq host flag")
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi.c')
| -rw-r--r-- | drivers/scsi/scsi.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 1f36aca44394..1deb6adc411f 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -1160,7 +1160,6 @@ bool scsi_use_blk_mq = true; bool scsi_use_blk_mq = false; #endif module_param_named(use_blk_mq, scsi_use_blk_mq, bool, S_IWUSR | S_IRUGO); -EXPORT_SYMBOL_GPL(scsi_use_blk_mq); static int __init init_scsi(void) { |