Revert "block: end bio with BLK_STS_AGAIN in case of non-mq devs and REQ_NOWAIT" (b0beb280) · Commits · 戴 / test

This reverts commit . io_uring does do the right thing for this case, and we're still returning -EAGAIN to userspace for the cases we don't support. Revert this change to avoid doing endless spins of resubmits. Cc: stable@vger.kernel.org # v5.6 Reported-by:

Bijan Mottahedeh <bijan.mottahedeh@oracle.com> Signed-off-by:

Jens Axboe <axboe@kernel.dk>

block/blk-core.c

+4 −7

Original line number	Diff line number	Diff line
		@@ -891,14 +891,11 @@ generic_make_request_checks(struct bio *bio)
		}

		/*
		* Non-mq queues do not honor REQ_NOWAIT, so complete a bio
		* with BLK_STS_AGAIN status in order to catch -EAGAIN and
		* to give a chance to the caller to repeat request gracefully.
		* For a REQ_NOWAIT based request, return -EOPNOTSUPP
		* if queue is not a request based queue.
		*/
		if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_mq(q)) {
		status = BLK_STS_AGAIN;
		goto end_io;
		}
		if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_mq(q))
		goto not_supported;

		if (should_fail_bio(bio))
		goto end_io;

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