[PATCH RFC 1/2] nvme: downgrade WARN in nvme_setup_rw to pr_debug

[Keith Busch]

On Sun, Apr 26, 2026 at 08:34:56PM -0400, Chao Shi wrote:
> In both cases the bio was submitted without REQ_INTEGRITY (because
> blk_get_integrity() returned NULL at dispatch time, so
> bio_integrity_action() returned 0 and bio_integrity_prep() was not
> called), and it reaches nvme_setup_rw() for a namespace where
> head->ms != 0.  The existing BLK_STS_NOTSUPP return correctly handles
> this dispatch; the WARN_ON_ONCE is a false positive.

This is what I'm not really following. The cached request holds a
reference on the queue that prevents the queue freeze from proceeding.
This driver freezes the queue along with the queue limits update. As I
mentioned in the other patch, that was supposed to ensure the block
layer had the updated limits before it could allocate a request, so I
think we need to understand how that was defeated to get to a real
solution.