From: Yubo Feng <fengyubo3@huawei.com>
Date: Wed, 12 Aug 2020 01:35:56 +0000 (-0700)
Subject: fatfs: switch write_lock to read_lock in fat_ioctl_get_attributes
X-Git-Tag: v5.9-rc1~52^2~57
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e348e65a081d761caf72c2753c4e3d67bfb1ef80;p=thirdparty%2Fkernel%2Flinux.git

fatfs: switch write_lock to read_lock in fat_ioctl_get_attributes

There is no need to hold write_lock in fat_ioctl_get_attributes.
write_lock may make an impact on concurrency of fat_ioctl_get_attributes.

Signed-off-by: Yubo Feng <fengyubo3@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Link: http://lkml.kernel.org/r/1593308053-12702-1-git-send-email-fengyubo3@huawei.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/fat/file.c b/fs/fat/file.c
index 42134c58c87e1..f9ee27cf4d7c2 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -25,9 +25,9 @@ static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
 {
 	u32 attr;
 
-	inode_lock(inode);
+	inode_lock_shared(inode);
 	attr = fat_make_attrs(inode);
-	inode_unlock(inode);
+	inode_unlock_shared(inode);
 
 	return put_user(attr, user_attr);
 }