[U-Boot] [PATCH] net: rtl8169: fix switching between adapters

[Stephen Warren <swarren@wwwdotorg.org>]

On 04/26/2016 04:05 PM, Joe Hershberger wrote:
> 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>

Joe,

I assume you'll be applying this?