From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
This reverts commit bba91cdba612fbce4f8575c5d94d2b146fb83ea3 which is
commit b0beb28097fa04177b3769f4bb7a0d0d9c4ae76e upstream.
It breaks things in 5.4.y, so let's drop it.
Reported-by: Andres Freund <andres@xxxxxxxxxxx>
Cc: Bijan Mottahedeh <bijan.mottahedeh@xxxxxxxxxx>
CC: Jens Axboe <axboe@xxxxxxxxx>
Cc: Sasha Levin <sashal@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
block/blk-core.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -886,11 +886,14 @@ generic_make_request_checks(struct bio *
}
/*
- * For a REQ_NOWAIT based request, return -EOPNOTSUPP
- * if queue is not a request based queue.
+ * 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.
*/
- if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_mq(q))
- goto not_supported;
+ if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_mq(q)) {
+ status = BLK_STS_AGAIN;
+ goto end_io;
+ }
if (should_fail_bio(bio))
goto end_io;
