linux-kernel - [PATCH v5 18/18] mm/filemap: Simplify generic_file_read

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Date:   Fri, 22 Jan 2021 16:01:40 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Christoph Hellwig <hch@....de>, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Matthew Wilcox <willy@...radead.org>,
        Kent Overstreet <kent.overstreet@...il.com>
Subject: [PATCH v5 18/18] mm/filemap: Simplify generic_file_read_iter

From: Christoph Hellwig <hch@....de>

Avoid the pointless goto out just for returning retval.

Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Reviewed-by: Kent Overstreet <kent.overstreet@...il.com>
---
 mm/filemap.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index ef910eca9e1a2..f5903494cf173 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2555,7 +2555,7 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 	ssize_t retval = 0;
 
 	if (!count)
-		goto out; /* skip atime */
+		return 0; /* skip atime */
 
 	if (iocb->ki_flags & IOCB_DIRECT) {
 		struct file *file = iocb->ki_filp;
@@ -2573,7 +2573,7 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 						iocb->ki_pos,
 					        iocb->ki_pos + count - 1);
 			if (retval < 0)
-				goto out;
+				return retval;
 		}
 
 		file_accessed(file);
@@ -2597,12 +2597,10 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 		 */
 		if (retval < 0 || !count || iocb->ki_pos >= size ||
 		    IS_DAX(inode))
-			goto out;
+			return retval;
 	}
 
-	retval = filemap_read(iocb, iter, retval);
-out:
-	return retval;
+	return filemap_read(iocb, iter, retval);
 }
 EXPORT_SYMBOL(generic_file_read_iter);
 
-- 
2.29.2