github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-07 22:14:04 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

blk-iolatency: error out if blk_get_queue() failed in iolatency_set_limit()

Browse Source 
[ Upstream commit 8d75d0eff6 ]

If queue is dying while iolatency_set_limit() is in progress,
blk_get_queue() won't increment the refcount of the queue. However,
blk_put_queue() will still decrement the refcount later, which will
cause the refcout to be unbalanced.

Thus error out in such case to fix the problem.

Fixes: 8c772a9bfc ("blk-iolatency: fix IO hang due to negative inflight counter")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20210805124645.543797-1-yukuai3@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yu Kuai 2021-08-05 20:46:45 +08:00 committed by Greg Kroah-Hartman
parent c5a499b860
commit 821e6a6133
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
block/blk-iolatency.c
View File

@ -833,7 +833,11 @@ static ssize_t iolatency_set_limit(struct kernfs_open_file *of, char *buf,
enable = iolatency_set_min_lat_nsec(blkg, lat_val); enable = iolatency_set_min_lat_nsec(blkg, lat_val);
if (enable) { if (enable) {
WARN_ON_ONCE(!blk_get_queue(blkg->q)); if (!blk_get_queue(blkg->q)) {
ret = -ENODEV;
goto out;
}
blkg_get(blkg); blkg_get(blkg);
} }