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authorJens Axboe <axboe@kernel.dk>2020-05-28 13:19:29 -0600
committerJens Axboe <axboe@kernel.dk>2020-05-28 13:20:39 -0600
commitb0beb28097fa04177b3769f4bb7a0d0d9c4ae76e (patch)
treee1fb1bb2d47a2e2b1b471a1d6426b9a39b184190
parent15fede122b23e126baeba69558a14c68e5d9359f (diff)
downloadlinux-sh-b0beb28097fa04177b3769f4bb7a0d0d9c4ae76e.tar.gz
Revert "block: end bio with BLK_STS_AGAIN in case of non-mq devs and REQ_NOWAIT"
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>
-rw-r--r--block/blk-core.c11
1 files changed, 4 insertions, 7 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 7e4a1da0715e..9bfaee050c82 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -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;