WARN_ON() hit in fsl bitbanged phy driver

[Scott Wood]

Rune Torgersen wrote:
> I hit the following WARN_ON when using mii-tools agains a ethernet
> interface using a bit-banged mii interface
> It is only diplayed once, and does not seem to impact usage at all
> 
> Does somebody know what is wrong, and how to fix it?

It looks like the kernel thinks it's in an interrupt, even though it 
clearly isn't from the backtrace.  Presumably, something slept from an 
interrupt handler; try turning on sleep-in-spinlock debugging.

The root cause was probably something other than the phy code.

-Scott