From a14c7d15ca91b444e77df08b916befdce77562ab Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Fri, 27 Feb 2015 17:16:26 +0100
Subject: [PATCH] sh_eth: Fix lost MAC address on kexec
Commit 740c7f31c094703c ("sh_eth: Ensure DMA engines are stopped before
freeing buffers") added a call to sh_eth_reset() to the
sh_eth_set_ringparam() and sh_eth_close() paths.
However, setting the software reset bit(s) in the EDMR register resets
the MAC Address Registers to zero. Hence after kexec, the new kernel
doesn't detect a valid MAC address and assigns a random MAC address,
breaking DHCP.
Set the MAC address again after the reset in sh_eth_dev_exit() to fix
this.
Tested on r8a7740/armadillo (GETHER) and r8a7791/koelsch (FAST_RCAR).
Fixes: 740c7f31c094703c ("sh_eth: Ensure DMA engines are stopped before freeing buffers")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/renesas/sh_eth.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 4da8bd263997..654b48d1e61a 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1392,6 +1392,9 @@ static void sh_eth_dev_exit(struct net_device *ndev)
msleep(2); /* max frame time at 10 Mbps < 1250 us */
sh_eth_get_stats(ndev);
sh_eth_reset(ndev);
+
+ /* Set MAC address again */
+ update_mac_address(ndev);
}
/* free Tx skb function */