Re: [PATCH] Add PM support to sis900 network driver

From: Andrew Morton
Date: Mon Nov 03 2003 - 15:07:40 EST

Daniele Venzano <webvenza@xxxxxxxxx> wrote:
> On Sun, Nov 02, 2003 at 11:12:54AM -0800, Andrew Morton wrote:
> > pci_set_power_state() can sleep, so we shouldn't be calling it
> > under spin_lock_irqsave(). Is it necessary to hold the lock
> > here?
> New patch with locking completely removed, since in a similar
> function none was used.

OK. I think. Net driver suspend handlers in general seem a bit racy wrt
interrupt activity as well as SMP. Maybe I'm missing something.

> I think also the 8139too driver has the same locking problem in
> rtl8139_suspend, do you want a patch ?

Wouldn't hurt, thanks. It's one way to wake Jeff up ;)

8139too just does netif_device_detach(), whereas your sis900 patch does
netif_stop_queue() and then netif_device_detach().

I don't know which is right, really. 8139too will end up with a
non-stopped queue if __LINK_STATE_PRESENT is clear. The sis900 approach is
certainly safe enough, but it'd be nice to know what netif_device_detach()
is trying to do there.
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