From: Simon Glass Date: Mon, 6 Jul 2015 22:47:55 +0000 (-0600) Subject: net: Allow drivers to return -ENOSYS with the write_hwaddr() method X-Git-Tag: KARO-TX6-2015-09-18~1235 X-Git-Url: https://git.karo-electronics.de/?p=karo-tx-uboot.git;a=commitdiff_plain;h=26a5233fba2f82ccac5e4044492c04a5597820e8 net: Allow drivers to return -ENOSYS with the write_hwaddr() method Some drivers may want to implement this method for some of their devices but not for others. So it is not possible to just leave the operation out of the table. Drivers could get around this by masquerading as two separate drivers but that seems unpleasant. Allow the driver to return an error when it does not want to process the write_hwaddr() method. Signed-off-by: Simon Glass --- diff --git a/include/net.h b/include/net.h index afe79915ff..af8617bea6 100644 --- a/include/net.h +++ b/include/net.h @@ -119,7 +119,9 @@ enum eth_recv_flags { * mcast: Join or leave a multicast group (for TFTP) - optional * write_hwaddr: Write a MAC address to the hardware (used to pass it to Linux * on some platforms like ARM). This function expects the - * eth_pdata::enetaddr field to be populated - optional + * eth_pdata::enetaddr field to be populated. The method can + * return -ENOSYS to indicate that this is not implemented for + this hardware - optional. * read_rom_hwaddr: Some devices have a backup of the MAC address stored in a * ROM on the board. This is how the driver should expose it * to the network stack. This function should fill in the diff --git a/net/eth.c b/net/eth.c index 72ce91c9d0..d3ec8d64d5 100644 --- a/net/eth.c +++ b/net/eth.c @@ -287,7 +287,13 @@ static int eth_write_hwaddr(struct udevice *dev) return -EINVAL; } + /* + * Drivers are allowed to decide not to implement this at + * run-time. E.g. Some devices may use it and some may not. + */ ret = eth_get_ops(dev)->write_hwaddr(dev); + if (ret == -ENOSYS) + ret = 0; if (ret) printf("\nWarning: %s failed to set MAC address\n", dev->name);