From: Jens Axboe <axboe@xxxxxxxxx>
[ 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@xxxxxxxxxxxxxxx # v5.6
Reported-by: Bijan Mottahedeh <bijan.mottahedeh@xxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 1075aaff606d..d5e668ec751b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -886,14 +886,11 @@ 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;
--
2.25.1
