[PATCH 2/2] nvme: use blk-mq polling for uring commands

[Keith Busch]

On Sun, Mar 26, 2023 at 04:01:46PM +0300, Sagi Grimberg wrote:
> On 3/25/23 00:28, Keith Busch wrote:
> > +	if (blk_rq_is_poll(req))
> > +		WRITE_ONCE(ioucmd->cookie, req);
> 
> Why aren't we always setting the cookie to point at the req?

As in unconditionally set the cookie even for non-polled requests? We need to
see that the cookie is NULL to prevent polling interrupt queues when an
io_uring polled command is dispatched to a device without polled hctx's.