On Tue, Apr 26, 2016 at 4:29 PM, Stephen Warren swarren@wwwdotorg.org wrote:
From: Stephen Warren swarren@nvidia.com
The rtl8169 driver uses a global variable to store the register address of the adapter being operated upon. This is updated to point at the correct adapter when sending or receiving a packet, or shutting down the adapter, but not when initializing the adapter. Consequently, switching between different adapters within the same U-Boot runtime does not work correctly since the driver programs the wrong registers during rtl8169_eth_start() -> rtl8169_common_start() -> rtl8169_hw_start().
Note that since rtl8169_eth_stop() does set the global variable, the second consecutive attempt to use the "new" adapter did work even before this patch, because each time network usage is shut down, the network core calls stop, which sets the variable so that the next start does actually initialize the hardware, and the adapter works.
Equally, rtl8169_eth_probe() calls rtl_init() which sets the global, so if using only a single device, or if picking the "right" device (based on probe order) when multiple devices are present, ioaddr will already be set correctly from the get-go, so the issue does not occur.
Signed-off-by: Stephen Warren swarren@nvidia.com
Looks reasonable to me. Acked-by: Joe Hershberger joe.hershberger@ni.com
Note that as with almost any patch, I believe NVIDIA copyright applies to the submission. However, I don't want to block all my work based on that other conversion, so I'm just going to deliberately ignore our policy of adding/updating copyright headers to files when editing them. Hopefully doing so deliberately (rather than the usual case of just forgetting) doesn't get me fired.
Hope you keep your job... at least if you like it.
-Joe