linux-kernel - Re: regression caused by: genirq: do not leave interupts enabled on free

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Date:	Fri, 11 Apr 2008 09:23:46 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"Thomas Gleixner" <tglx@...utronix.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>, "Jeff Garzik" <jeff@...zik.org>,
	"Ayaz Abdulla" <aabdulla@...dia.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: regression caused by: genirq: do not leave interupts enabled on free_irq

On Fri, Apr 11, 2008 at 8:19 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>
> 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@...il.com> wrote:
>  > > > > On Fri, Apr 11, 2008 at 12:01 AM, Thomas Gleixner <tglx@...utronix.de> 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?

then another path that missing enable irq..

YH
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