From: Jens Axboe axboe@kernel.dk
[ Upstream commit b0beb28097fa04177b3769f4bb7a0d0d9c4ae76e ]
This reverts commit c58c1f83436b501d45d4050fd1296d71a9760bcb.
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 Signed-off-by: Sasha Levin sashal@kernel.org --- block/blk-core.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c index 60dc9552ef8d..92232907605c 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -885,14 +885,11 @@ 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;