[D/E/OEM-OSP1-B] [PATCH 2/3] r8152: Refresh MAC address during USBDEVFS_RESET

[Kai-Heng Feng]

From: Mario Limonciello <mario.limonciello at dell.com>

BugLink: https://bugs.launchpad.net/bugs/1847063

On some platforms it is possible to dynamically change the policy
of what MAC address is selected from the ASL at runtime.

These tools will reset the USB device and expect the change to be
made immediately.

Signed-off-by: Mario Limonciello <mario.limonciello at dell.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit 25766271e42f6b15b72ba156cb42a3fea91b5b21)
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
---
 drivers/net/usb/r8152.c | 50 ++++++++++++++++++++++++++++-------------
 1 file changed, 35 insertions(+), 15 deletions(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index ba11cc7dad04..9193f845095f 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -1220,43 +1220,55 @@ static int vendor_mac_passthru_addr_read(struct r8152 *tp, struct sockaddr *sa)
 	return ret;
 }
 
-static int set_ethernet_addr(struct r8152 *tp)
+static int determine_ethernet_addr(struct r8152 *tp, struct sockaddr *sa)
 {
 	struct net_device *dev = tp->netdev;
-	struct sockaddr sa;
 	int ret;
 
 	if (tp->version == RTL_VER_01) {
-		ret = pla_ocp_read(tp, PLA_IDR, 8, sa.sa_data);
+		ret = pla_ocp_read(tp, PLA_IDR, 8, sa->sa_data);
 	} else {
 		/* if device doesn't support MAC pass through this will
 		 * be expected to be non-zero
 		 */
-		ret = vendor_mac_passthru_addr_read(tp, &sa);
+		ret = vendor_mac_passthru_addr_read(tp, sa);
 		if (ret < 0)
-			ret = pla_ocp_read(tp, PLA_BACKUP, 8, sa.sa_data);
+			ret = pla_ocp_read(tp, PLA_BACKUP, 8, sa->sa_data);
 	}
 
 	if (ret < 0) {
 		netif_err(tp, probe, dev, "Get ether addr fail\n");
-	} else if (!is_valid_ether_addr(sa.sa_data)) {
+	} else if (!is_valid_ether_addr(sa->sa_data)) {
 		netif_err(tp, probe, dev, "Invalid ether addr %pM\n",
-			  sa.sa_data);
+			  sa->sa_data);
 		eth_hw_addr_random(dev);
-		ether_addr_copy(sa.sa_data, dev->dev_addr);
-		ret = rtl8152_set_mac_address(dev, &sa);
+		ether_addr_copy(sa->sa_data, dev->dev_addr);
 		netif_info(tp, probe, dev, "Random ether addr %pM\n",
-			   sa.sa_data);
-	} else {
-		if (tp->version == RTL_VER_01)
-			ether_addr_copy(dev->dev_addr, sa.sa_data);
-		else
-			ret = rtl8152_set_mac_address(dev, &sa);
+			   sa->sa_data);
+		return 0;
 	}
 
 	return ret;
 }
 
+static int set_ethernet_addr(struct r8152 *tp)
+{
+	struct net_device *dev = tp->netdev;
+	struct sockaddr sa;
+	int ret;
+
+	ret = determine_ethernet_addr(tp, &sa);
+	if (ret < 0)
+		return ret;
+
+	if (tp->version == RTL_VER_01)
+		ether_addr_copy(dev->dev_addr, sa.sa_data);
+	else
+		ret = rtl8152_set_mac_address(dev, &sa);
+
+	return ret;
+}
+
 static void read_bulk_callback(struct urb *urb)
 {
 	struct net_device *netdev;
@@ -4262,10 +4274,18 @@ static int rtl8152_post_reset(struct usb_interface *intf)
 {
 	struct r8152 *tp = usb_get_intfdata(intf);
 	struct net_device *netdev;
+	struct sockaddr sa;
 
 	if (!tp)
 		return 0;
 
+	/* reset the MAC adddress in case of policy change */
+	if (determine_ethernet_addr(tp, &sa) >= 0) {
+		rtnl_lock();
+		dev_set_mac_address (tp->netdev, &sa, NULL);
+		rtnl_unlock();
+	}
+
 	netdev = tp->netdev;
 	if (!netif_running(netdev))
 		return 0;
-- 
2.17.1