blk-cgroup: protect q->blkg_list iteration in blkg_destroy_all() with blkcg_mutex

blkg_destroy_all() iterates q->blkg_list without holding blkcg_mutex,
which can race with blkg_free_workfn() that removes blkgs from the list
while holding blkcg_mutex.

Add blkcg_mutex protection around the q->blkg_list iteration to prevent
potential list corruption or use-after-free issues.

Reviewed-by: Tang Yizhou <yizhou.tang@shopee.com>
Signed-off-by: Yu Kuai <yukuai@fygo.io>
Reviewed-by: Tao Cui <cuitao@kylinos.cn>
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Link: https://patch.msgid.link/20260802112525.3933753-2-yukuai@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions