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| author |   Nilay Shroff <nilay@linux.ibm.com> | 2025-03-19 16:23:45 +0530 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2025-03-19 11:35:45 -0600 |
| commit | 89ed5fa3b5419f04452051fbcb6d3e5b801cdb1b (patch) | |
| tree | c73f710487b216e4b0c00d4f4b6f0cfb55b2d4af | |
| parent | ublk: remove io_cmds list in ublk_queue (diff) | |
| download | wireguard-linux-89ed5fa3b5419f04452051fbcb6d3e5b801cdb1b.tar.xz wireguard-linux-89ed5fa3b5419f04452051fbcb6d3e5b801cdb1b.zip | |
block: release q->elevator_lock in ioc_qos_write
The ioc_qos_write method acquires q->elevator_lock to protect
updates to blk-wbt parameters. Once these updates are complete,
the lock should be released before returning from ioc_qos_write.
However, in one code path, the release of q->elevator_lock was
mistakenly omitted, potentially leading to a lock leak. This commit
fixes the issue by ensuring that q->elevator_lock is properly
released in all return paths of ioc_qos_write.
Fixes: 245618f8e45f ("block: protect wbt_lat_usec using q->elevator_lock")
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202503171650.cc082b66-lkp@intel.com
Signed-off-by: Nilay Shroff <nilay@linux.ibm.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20250319105518.468941-2-nilay@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to '')
| -rw-r--r-- | block/blk-iocost.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c index 38e7bf3c3b4f..56e6fb51316d 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -3348,6 +3348,7 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input, wbt_enable_default(disk); blk_mq_unquiesce_queue(disk->queue); + mutex_unlock(&disk->queue->elevator_lock); blk_mq_unfreeze_queue(disk->queue, memflags); blkg_conf_exit(&ctx); |