linux-kernel - Re: [BUG] e100: eth0 appers many times in /proc/interrupts after resume

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Message-ID: <20070121220457.GC8958@slug>
Date:	Sun, 21 Jan 2007 22:04:57 +0000
From:	Frederik Deweerdt <deweerdt@...e.fr>
To:	Auke Kok <auke-jan.h.kok@...el.com>
Cc:	Andrei Popa <andrei.popa@...eo.ro>, linux-kernel@...r.kernel.org,
	nigel@...pend2.net, NetDev <netdev@...r.kernel.org>
Subject: Re: [BUG] e100: eth0 appers many times in /proc/interrupts after resume

On Sun, Jan 21, 2007 at 01:45:27PM -0800, Auke Kok wrote:
> Frederik Deweerdt wrote:
> >On Sun, Jan 21, 2007 at 09:17:41PM +0200, Andrei Popa wrote:
> >>It's the 10th resume and in /proc/interrupts eth0 appers 10 times.
> >The e100_resume() function should be calling netif_device_detach and
> >free_irq. Could you try the following (compile tested) patch?
> 
> I just fixed suspend/shutdown for e100 in 2.6.19, not sure why the problem still shows up. Since it's a driver/net issue, you 
> should CC netdev on it tho, otherwise it might go unnoticed.
Thanks for adding the CC
> 
> I'll open up the can-o-worms on this issue and see what's up with it.
> 
> I'm not so sure that this patch is OK, and I wonder why it stopped working, because I spent quite some time fixing it only a 
> few months ago. Did swsup change again? sigh...

I may well be wrong (It appears that most of the time I am :)), but the
unbalanced netif_device_attach (in resume) looks suspicious.  resume()
also calls request_irq, so calling free_irq on suspend seemed logical.

Regards,
Frederik

> 
> Auke
> 
> >Signed-off-by: Frederik Deweerdt <frederik.deweerdt@...il.com>
> >diff --git a/drivers/net/e100.c b/drivers/net/e100.c
> >index 2fe0445..0c376e4 100644
> >--- a/drivers/net/e100.c
> >+++ b/drivers/net/e100.c
> >@@ -2671,6 +2671,7 @@ static int e100_suspend(struct pci_dev *pdev, pm_message_t state)
> > 	del_timer_sync(&nic->watchdog);
> > 	netif_carrier_off(nic->netdev);
> > +	netif_device_detach(netdev);
> > 	pci_save_state(pdev);
> >  	if ((nic->flags & wol_magic) | e100_asf(nic)) {
> >@@ -2682,6 +2683,7 @@ static int e100_suspend(struct pci_dev *pdev, pm_message_t state)
> > 	}
> >  	pci_disable_device(pdev);
> >+	free_irq(pdev->irq, netdev);
> > 	pci_set_power_state(pdev, PCI_D3hot);
> >  	return 0;
> >-
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