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| author | Nilay Shroff <nilay@linux.ibm.com> | 2025-01-28 20:04:14 +0530 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-01-29 07:16:47 -0700 |
| commit | 14ef49657ff3b7156952b2eadcf2e5bafd735795 (patch) | |
| tree | aa1ede3f316d5037e030900684af1372c398310a /mm/shuffle.h | |
| parent | fe6628608627424fb4a6d4c8d2235822457c5d9c (diff) | |
| download | linux-14ef49657ff3b7156952b2eadcf2e5bafd735795.tar.gz linux-14ef49657ff3b7156952b2eadcf2e5bafd735795.tar.bz2 linux-14ef49657ff3b7156952b2eadcf2e5bafd735795.zip | |
block: fix nr_hw_queue update racing with disk addition/removal
The nr_hw_queue update could potentially race with disk addtion/removal
while registering/unregistering hctx sysfs files. The __blk_mq_update_
nr_hw_queues() runs with q->tag_list_lock held and so to avoid it racing
with disk addition/removal we should acquire q->tag_list_lock while
registering/unregistering hctx sysfs files.
With this patch, blk_mq_sysfs_register() (called during disk addition)
and blk_mq_sysfs_unregister() (called during disk removal) now runs
with q->tag_list_lock held so that it avoids racing with __blk_mq_update
_nr_hw_queues().
Signed-off-by: Nilay Shroff <nilay@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20250128143436.874357-3-nilay@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'mm/shuffle.h')
0 files changed, 0 insertions, 0 deletions