[PATCH 3/3] net/eth: fix link handling

[Jean-Christophe PLAGNIOL-VILLARD]

On 14:50 Wed 26 Sep     , Jan Lübbe wrote:
> On Wed, 2012-09-26 at 14:43 +0200, Sascha Hauer wrote:
> > The eth->active is for tracking whether a device is opened (thus we have
> > to call eth->halt). With this patch eth->active == 0 could mean:
> > 
> > a) device not opened
> > b) opened, but no link
> > 
> > This is asking for trouble. A bit only has two states, you should not
> > encode three states in it.
> 
> Yes. We should not repeatedly open the device to check link status
> again. A open (active==1) device with no link is perfectly valid, it
> just can't be used for TX/RX.
> 
> So if we have an open device in TX/RX and
>   link down: recheck link
>   link up: recheck link if the last check is "too old"
> 
> This way we notice both link going down and up, while not wasting time
> when we are waiting for link up.
except this can not work in barebox. In linux you can as you have a schedule
work that check the phy status. In barebox we do not do so and I do not want
it (slow down the boot). So we check it at the open only and only once. When
the phy is up we do not check it again.

Remember we are in a bootloader not in an os we need to do some concession.

Best Regards,
J.