On Wed, Mar 23, 2022 at 12:12:38AM +0800, Ming Lei wrote:
> blkg_free() may be called in atomic context, either spin lock is held,
> or run in rcu callback. Meantime either request queue's release handler
> or ->pd_free_fn can sleep.
>
> Fix the issue by scheduling work function for freeing blkcg_gq instance.
>
> Cc: Tejun Heo <tj@xxxxxxxxxx>
> Fixes: 0a9a25ca7843 ("block: let blkcg_gq grab request queue's refcnt")
> Reported-by: Christoph Hellwig <hch@xxxxxx>
> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
Do you have an example of this being a problem?
Thanks.
--
tejun
