Re: regression caused by: genirq: do not leave interupts enabled on free_irq

From: Rafael J. Wysocki
Date: Fri Apr 11 2008 - 11:19:34 EST


On Friday, 11 of April 2008, Thomas Gleixner wrote:
> On Fri, 11 Apr 2008, Eric W. Biederman wrote:
> > On Fri, 2008-04-11 at 00:17 -0700, Yinghai Lu wrote:
> > > On Fri, Apr 11, 2008 at 12:14 AM, Yinghai Lu <yhlu.kernel@xxxxxxxxx> wrote:
> > > > On Fri, Apr 11, 2008 at 12:01 AM, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> > > > > On Thu, 10 Apr 2008, Yinghai Lu wrote:
> > > > > > last week found:
> > > > > > after latest kernel kexec RHEL 5.1 or other stack kernel, the nvidia
> > > > > > forcedeth doesn't work anymore.
> > > > > >
> > > > > > I stared at forcedeth.c two days. and revert every patches about that
> > > > > > doesn't help.
> > > > >
> > > > > So forcedeth does not come up again, when you kexec from linus.git
> > > > > into an older distro kernel. Or is it the other way round ?
> > > > RHEL 5.1 kexec RHEL 5.1 : works
> > > > RHEL 5.1 kexec linus kernel: works
> > > > linus (after -rc2) kexec linus tree: works:
> > > > linus (after -rc2) kexec RHEL 5.1 : forcedeth will not come up
> > > > linus ( before -rc2 include rc2) kexec RHEL 5.1 works
> > > >
> > > the forcedeth can not get IP address...
> >
> > Sounds like you are not getting any interrupts when you receive a
> > packet. (i.e. The interrupt line is staying disabled).
> >
> > Is MSI an option here? I'm wondering if we disable the MSI and
> > something is not enabling it.
>
> Hmm, we disable the interrupt on free_irq(), but we reenable it in
> request_irq()/setup_irq(), which is called when the forcedeth driver
> initializes in the kexeced kernel. So there is some other deeper down
> problem lurking.
>
> Yinghai, can you apply that patch to RHEL 5.1 and check, what happens
> if you do:
>
> modprobe forcedeth
> ifup ...
> ifdown ...
> rmmod forcedeth
> modprobe forcedeth
> ifup ...
>
> This should result in the same problem, but probably simpler to debug.

I've just got a report from a forcedeth user that it doesn't work after a
resume from RAM for him any more. Can it be related?

Rafael
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