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

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Message-Id: <20080415004400.bb941191.akpm@linux-foundation.org>
Date:	Tue, 15 Apr 2008 00:44:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...e.hu>, "Jeff Garzik" <jeff@...zik.org>,
	"Ayaz Abdulla" <aabdulla@...dia.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: regression caused by: genirq: do not leave interupts enabled on
 free_irq

On Fri, 11 Apr 2008 12:48:43 -0700 "Yinghai Lu" <yhlu.kernel@...il.com> wrote:

> On Fri, Apr 11, 2008 at 11:22 AM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
> > On Fri, Apr 11, 2008 at 12:30 AM, Eric W. Biederman
> >  <ebiederm@...ssion.com> 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.
> >
> >
> >
> >  after
> >  setpci -s 0x00:08.0 0x60.b=0xfe
> >
> >  the eth0 can get ip address with ifup eth0.
> 
> it is RHEL 5.1 problem...with msi.
> 
> somehow msi entry msi_attrib_maskbit=is_mask_bit_support always get
> 0...., and use msi_irq_wo_maskbit_type instead of
> msi_irq_w_maskbit_type
> 
> so when load that directly without kexec
> that 0x60 always to 0x00.
> 
> and this time kernel after 2.6.25-rc2 ( not included) really shutdown
> the msi with 0xff the all maskbit...
> 

So... where did this end up?   It's a post-2.6.24 regression, isn't it?

Do we think it's a bug in the RHEL 5.1 kernel?  Even so, that's a problem
for the 2.6.25 kernel.

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