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authorGuenter Roeck <linux@roeck-us.net>2015-03-12 16:58:26 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-03-25 15:27:57 +0300
commitda4759c73b0f1aac79f37bdb39ad2124439c30e7 (patch)
tree011082768adf0cd5a01df1509a242640dec90b2c
parentbc465aa9d045feb0e13b4a8f32cc33c1943f62d6 (diff)
downloadlinux-da4759c73b0f1aac79f37bdb39ad2124439c30e7.tar.xz
sysfs: Use only return value from is_visible for the file mode
Up to now, is_visible can only be used to either remove visibility of a file entirely or to add permissions, but not to reduce permissions. This makes it impossible, for example, to use DEVICE_ATTR_RW to define file attributes and reduce permissions to read-only. This behavior is undesirable and unnecessarily complicates code which needs to reduce permissions; instead of just returning the desired permissions, it has to ensure that the permissions in the attribute variable declaration only reflect the minimal permissions ever needed. Change semantics of is_visible to only use the permissions returned from it instead of oring the returned value with the hard-coded permissions. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/sysfs/group.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
index 2554d8835b48..3fdccd99a9d9 100644
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -41,7 +41,7 @@ static int create_files(struct kernfs_node *parent, struct kobject *kobj,
if (grp->attrs) {
for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++) {
- umode_t mode = 0;
+ umode_t mode = (*attr)->mode;
/*
* In update mode, we're changing the permissions or
@@ -56,8 +56,7 @@ static int create_files(struct kernfs_node *parent, struct kobject *kobj,
continue;
}
error = sysfs_add_file_mode_ns(parent, *attr, false,
- (*attr)->mode | mode,
- NULL);
+ mode, NULL);
if (unlikely(error))
break;
}