From: "Michael Chan" <mchan@broadcom.com>
Date: Mon, 04 Aug 2008 07:20:40 -0700

quoted text
> This was introduced by:
> 
> tg3: adapt tg3 to use reworked PCI PM code
> 
> Adapt the tg3 driver to use the reworked PCI PM and make it use the
> exported PCI PM core functions instead of accessing the PCI PM registers
> directly by itself.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: David S. Miller <davem@davemloft.net>
> 
> In the original tg3 code, we used udelay() when switching to D0 state
> since we were inside tg3_full_lock().

Right, this change was obviously not tested properly.

I'm likely going to revert unless a really good fix shows up fast.
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