sh_eth: Fix lost MAC address on kexec
authorGeert Uytterhoeven <geert+renesas@glider.be>
Fri, 27 Feb 2015 16:16:26 +0000 (17:16 +0100)
committerDavid S. Miller <davem@davemloft.net>
Sun, 1 Mar 2015 05:06:20 +0000 (00:06 -0500)
commita14c7d15ca91b444e77df08b916befdce77562ab
treebd80e3660f1c0cd27a9e4edf4a6896a7e60db645
parent4092e6acf5cb16f56154e2dd22d647023dc3d646
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