net: fec: add netif status check before set mac address

There exist one issue by below case that case system hang:
ifconfig eth0 down
ifconfig eth0 hw ether 00:10:19:19:81:19

After eth0 down, all fec clocks are gated off. In the .fec_set_mac_address()
function, it will set new MAC address to registers, which causes system hang.

So it needs to add netif status check to avoid registers access when clocks are
gated off. Until eth0 up the new MAC address are wrote into related registers.

V2:
As Lucas Stach's suggestion, add a comment in the code to explain why it needed.

CC: Lucas Stach <l.stach@pengutronix.de>
CC: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 6cc334035e07339fa47813dc4ae304ee86fe7b03..dd4ca39d5d8f62cf96190576224799d00d17b2ff 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -3031,6 +3031,14 @@ fec_set_mac_address(struct net_device *ndev, void *p)
                memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len);
        }
 
+       /* Add netif status check here to avoid system hang in below case:
+        * ifconfig ethx down; ifconfig ethx hw ether xx:xx:xx:xx:xx:xx;
+        * After ethx down, fec all clocks are gated off and then register
+        * access causes system hang.
+        */
+       if (!netif_running(ndev))
+               return 0;
+
        writel(ndev->dev_addr[3] | (ndev->dev_addr[2] << 8) |
                (ndev->dev_addr[1] << 16) | (ndev->dev_addr[0] << 24),
                fep->hwp + FEC_ADDR_LOW);