FAILED: patch "[PATCH] io_uring: clear IOCB_WAITQ for non -EIOCBQUEUED return" failed to apply to 5.11-stable tree

The patch below does not apply to the 5.11-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b5b0ecb736f1ce1e68eb50613c0cfecff10198eb Mon Sep 17 00:00:00 2001
From: Jens Axboe <[email protected]>
Date: Thu, 4 Mar 2021 21:02:58 -0700
Subject: [PATCH] io_uring: clear IOCB_WAITQ for non -EIOCBQUEUED return

The callback can only be armed, if we get -EIOCBQUEUED returned. It's important that we clear the WAITQ bit for other cases, otherwise we can queue for async retry and filemap will assume that we're armed and return -EAGAIN instead of just blocking for the IO.

index 044170165402..5762750c666c 100644
@@ -3286,6 +3286,7 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags)
 		if (ret == -EIOCBQUEUED)
 			return 0;
 		/* we got some bytes, but not all. retry. */
+		kiocb->ki_flags &= ~IOCB_WAITQ;
 	} while (ret > 0 && ret < io_size);
 done:
 	kiocb_done(kiocb, ret, issue_flags);