Re: [RFC v2 5/5] block: revert back to synchronous request_queue removal

[Bart Van Assche]

On 2020-04-10 14:27, Luis Chamberlain wrote:
> On Fri, Apr 10, 2020 at 2:50 PM Luis Chamberlain <mcgrof@xxxxxxxxxx> wrote:
>>
>> On Fri, Apr 10, 2020 at 8:34 AM Luis Chamberlain <mcgrof@xxxxxxxxxx> wrote:
>>> On Thu, Apr 09, 2020 at 08:12:21PM -0700, Bart Van Assche wrote:
>>>> Please add a might_sleep() call in blk_put_queue() since with this patch
>>>> applied it is no longer allowed to call blk_put_queue() from atomic context.
>>>
>>> Sure thing.
>>
>> On second though, I don't think blk_put_queue() would be the right
>> place for might_sleep(), given we really only care about the *last*
>> refcount decrement to 0. So I'll move it to blk_release_queue().
>> Granted, at that point we are too late, and we'd get a splat about
>> this issue *iff* we really sleep. So yeah, I do suppose that forcing
>> this check there still makes sense.
> 
> I'll add might_sleep() to both blk_release_queue() *and* blk_cleanup_queue().

Since there is already an unconditional mutex_lock() call in
blk_cleanup_queue(), do we really need to add a might_sleep() call in
blk_cleanup_queue()?

Thanks,

Bart.