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| author | Ming Lei <ming.lei@redhat.com> | 2023-12-19 09:28:33 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2024-01-04 16:08:54 -0700 |
| commit | 393cd8ffd832f23eec3a105553eff622e8198918 (patch) | |
| tree | b37dc63e9f9e593a4128b326ac63077056ee8650 /drivers/block/xen-blkback | |
| parent | fab4c16c527e24c804efa4992b3cf40438c9b227 (diff) | |
| download | linux-393cd8ffd832f23eec3a105553eff622e8198918.tar.gz linux-393cd8ffd832f23eec3a105553eff622e8198918.tar.bz2 linux-393cd8ffd832f23eec3a105553eff622e8198918.zip | |
blk-cgroup: fix rcu lockdep warning in blkg_lookup()
blkg_lookup() is called with either queue_lock or rcu read lock, so
use rcu_dereference_check(lockdep_is_held(&q->queue_lock)) for
retrieving 'blkg', which way models the check exactly for covering
queue lock or rcu read lock.
Fix lockdep warning of "block/blk-cgroup.h:254 suspicious rcu_dereference_check() usage!"
from blkg_lookup().
Tested-by: Changhui Zhong <czhong@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Fixes: 83462a6c971c ("blkcg: Drop unnecessary RCU read [un]locks from blkg_conf_prep/finish()")
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20231219012833.2129540-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/xen-blkback')
0 files changed, 0 insertions, 0 deletions