OpenWrt – Rev 1

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--- a/net/wireless/sysfs.c
+++ b/net/wireless/sysfs.c
@@ -24,18 +24,35 @@ static inline struct cfg80211_registered
        return container_of(dev, struct cfg80211_registered_device, wiphy.dev);
 }
 
-#define SHOW_FMT(name, fmt, member)                                    \
+#define SHOW_FMT(name, fmt, member, mode)                              \
 static ssize_t name ## _show(struct device *dev,                       \
                              struct device_attribute *attr,            \
                              char *buf)                                \
 {                                                                      \
        return sprintf(buf, fmt "\n", dev_to_rdev(dev)->member);        \
 }                                                                      \
-static DEVICE_ATTR_RO(name)
+static DEVICE_ATTR_##mode(name)
 
-SHOW_FMT(index, "%d", wiphy_idx);
-SHOW_FMT(macaddress, "%pM", wiphy.perm_addr);
-SHOW_FMT(address_mask, "%pM", wiphy.addr_mask);
+static ssize_t macaddress_store(struct device *dev,
+                               struct device_attribute *attr,
+                               const char *buf, size_t len)
+{
+       u8 mac[ETH_ALEN];
+
+       if (!mac_pton(buf, mac))
+               return -EINVAL;
+
+       if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n')
+               return -EINVAL;
+
+       memcpy(dev_to_rdev(dev)->wiphy.perm_addr, mac, ETH_ALEN);
+
+       return strnlen(buf, len);
+}
+
+SHOW_FMT(index, "%d", wiphy_idx, RO);
+SHOW_FMT(macaddress, "%pM", wiphy.perm_addr, RW);
+SHOW_FMT(address_mask, "%pM", wiphy.addr_mask, RO);
 
 static ssize_t name_show(struct device *dev,
                         struct device_attribute *attr,