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authorJens Axboe <axboe@kernel.dk>2023-07-20 13:16:53 -0600
committerJens Axboe <axboe@kernel.dk>2023-07-20 13:16:53 -0600
commita9be202269580ca611c6cebac90eaf1795497800 (patch)
tree175dce525abd29b675fc475ec8eb973053d269bb /io_uring
parent6adc2272aaaf84f34b652cf77f770c6fcc4b8336 (diff)
io_uring: treat -EAGAIN for REQ_F_NOWAIT as final for io-wq
io-wq assumes that an issue is blocking, but it may not be if the request type has asked for a non-blocking attempt. If we get -EAGAIN for that case, then we need to treat it as a final result and not retry or arm poll for it. Cc: stable@vger.kernel.org # 5.10+ Link: https://github.com/axboe/liburing/issues/897 Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring')
-rw-r--r--io_uring/io_uring.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index a9923676d16d..5e97235a82d6 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1948,6 +1948,14 @@ fail:
ret = io_issue_sqe(req, issue_flags);
if (ret != -EAGAIN)
break;
+
+ /*
+ * If REQ_F_NOWAIT is set, then don't wait or retry with
+ * poll. -EAGAIN is final for that case.
+ */
+ if (req->flags & REQ_F_NOWAIT)
+ break;
+
/*
* We can get EAGAIN for iopolled IO even though we're
* forcing a sync submission from here, since we can't