[dm-devel] [PATCH v7 1/3] block: add blk_mq_is_queue_frozen()

[Christoph Hellwig]

On Fri, Mar 12, 2021 at 02:06:41PM -0500, Mike Snitzer wrote:
> This is returning a frozen state that is immediately stale.  I don't
> think any code calling this is providing the guarantees you think it
> does due to the racey nature of this state once the mutex is dropped.

The code only uses it for asserts in the form of WARN_ONs.