From: Geert Uytterhoeven Date: Fri, 27 Feb 2015 16:16:26 +0000 (+0100) Subject: sh_eth: Fix lost MAC address on kexec X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a14c7d15ca91b444e77df08b916befdce77562ab;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 Signed-off-by: David S. Miller --- 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 */