md/md-llbitmap: fix percpu_ref not resurrected on suspend timeout

Browse source

[ Upstream commit d119bd2e16 ]

When llbitmap_suspend_timeout() times out waiting for percpu_ref to
become zero, it returns -ETIMEDOUT without resurrecting the percpu_ref.
The caller (md_llbitmap_daemon_fn) then continues to the next page
without calling llbitmap_resume(), leaving the percpu_ref in a killed
state permanently.

Fix this by resurrecting the percpu_ref before returning the error,
ensuring the page control structure remains usable for subsequent
operations.

Link: https://lore.kernel.org/linux-raid/20260123182623.3718551-3-yukuai@fnnas.com
Fixes: 5ab829f197 ("md/md-llbitmap: introduce new lockless bitmap")
Signed-off-by: Yu Kuai <yukuai@fnnas.com>
Reviewed-by: Li Nan <linan122@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Yu Kuai 2026-01-24 02:26:23 +08:00 • committed by Greg Kroah-Hartman

parent 870b9f1586

commit 095417d6b6

1 changed files with 3 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

4

drivers/md/md-llbitmap.c

View file