net: dsa: use DEVICE_ATTR_RW to declare temp1_max

Since commit da4759c (sysfs: Use only return value from is_visible for
the file mode), it is possible to reduce the permissions of a file.

So declare temp1_max with the DEVICE_ATTR_RW macro and remove the write
permission in dsa_hwmon_attrs_visible if set_temp_limit isn't provided.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 5eaadabe23a1..079a224471e7 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -124,7 +124,7 @@ static ssize_t temp1_max_store(struct device *dev,
 
         return count;
 }
-static DEVICE_ATTR(temp1_max, S_IRUGO, temp1_max_show, temp1_max_store);
+static DEVICE_ATTR_RW(temp1_max);
 
 static ssize_t temp1_max_alarm_show(struct device *dev,
                                     struct device_attribute *attr, char *buf)
@@ -159,8 +159,8 @@ static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
         if (index == 1) {
                 if (!drv->get_temp_limit)
                         mode = 0;
-                else if (drv->set_temp_limit)
-                        mode |= S_IWUSR;
+                else if (!drv->set_temp_limit)
+                        mode &= ~S_IWUSR;
         } else if (index == 2 && !drv->get_temp_alarm) {
                 mode = 0;
         }