linux-kernel - [PATCH] fs/file.c: remove useless xchg and NULL check in close

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Date:	Wed, 15 Apr 2015 06:47:40 +0200
From:	Mateusz Guzik <mguzik@...hat.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] fs/file.c: remove useless xchg and NULL check in close_files

Since the table is about to be freed, there is no reason to set file
pointer to NULL on closing.

At this point open_fd map is supposed to indicate whether a file is
installed, so NULL-checking it is unnecessary.

Signed-off-by: Mateusz Guzik <mguzik@...hat.com>
---
 fs/file.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/file.c b/fs/file.c
index 93c5f89..35a024a 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -364,11 +364,8 @@ static struct fdtable *close_files(struct files_struct * files)
 		set = fdt->open_fds[j++];
 		while (set) {
 			if (set & 1) {
-				struct file * file = xchg(&fdt->fd[i], NULL);
-				if (file) {
-					filp_close(file, files);
-					cond_resched_rcu_qs();
-				}
+				filp_close(fdt->fd[i], files);
+				cond_resched_rcu_qs();
 			}
 			i++;
 			set >>= 1;
-- 
1.8.3.1

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