From: Pavel Begunkov <asml.silence@gmail.com>
Date: Mon, 1 Feb 2021 18:59:56 +0000 (+0000)
Subject: io_uring: simplify do_read return parsing
X-Git-Tag: accepted/tizen/unified/20230118.172025~7716^2~86
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=57cd657b8272a66277c139e7bbdc8b86057cb415;p=platform%2Fkernel%2Flinux-rpi.git

io_uring: simplify do_read return parsing

do_read() returning 0 bytes read (not -EAGAIN/etc.) is not an important
enough of a case to prioritise it. Fold it into ret < 0 check, so we get
rid of an extra if and make it a bit more readable.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 7787827..24ad36d 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3526,7 +3526,6 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
 	else
 		kiocb->ki_flags |= IOCB_NOWAIT;
 
-
 	/* If the file doesn't support async, just async punt */
 	no_async = force_nonblock && !io_file_supports_async(req->file, READ);
 	if (no_async)
@@ -3538,9 +3537,7 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
 
 	ret = io_iter_do_read(req, iter);
 
-	if (!ret) {
-		goto done;
-	} else if (ret == -EIOCBQUEUED) {
+	if (ret == -EIOCBQUEUED) {
 		ret = 0;
 		goto out_free;
 	} else if (ret == -EAGAIN) {
@@ -3554,7 +3551,7 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
 		iov_iter_revert(iter, io_size - iov_iter_count(iter));
 		ret = 0;
 		goto copy_iov;
-	} else if (ret < 0) {
+	} else if (ret <= 0) {
 		/* make sure -ERESTARTSYS -> -EINTR is done */
 		goto done;
 	}