linux-kernel - Re: [PATCH] ACPI/APEI: Clear GHES block

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Message-ID: <1691682.ckC9UJvgEr@aspire.rjw.lan>
Date:   Fri, 21 Dec 2018 12:17:21 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Borislav Petkov <bp@...en8.de>, David Arcari <darcari@...hat.com>
Cc:     Linux ACPI <linux-acpi@...r.kernel.org>,
        Lenny Szubowicz <lszubowi@...hat.com>,
        Len Brown <lenb@...nel.org>, Tony Luck <tony.luck@...el.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Alexandru Gagniuc <mr.nuke.me@...il.com>,
        linux-kernel@...r.kernel.org, James Morse <james.morse@....com>
Subject: Re: [PATCH] ACPI/APEI: Clear GHES block_status before panic()

On Thursday, December 20, 2018 8:24:47 PM CET Borislav Petkov wrote:
> + James.
> 
> On Wed, Dec 19, 2018 at 11:50:52AM -0500, David Arcari wrote:
> > From: Lenny Szubowicz <lszubowi@...hat.com>
> > 
> > In __ghes_panic() clear the block status in the APEI generic
> > error status block for that generic hardware error source before
> > calling panic() to prevent a second panic() in the crash kernel
> > for exactly the same fatal error.
> > 
> > Otherwise ghes_probe(), running in the crash kernel, would see
> > an unhandled error in the APEI generic error status block and
> > panic again, thereby precluding any crash dump.
> > 
> > Signed-off-by: Lenny Szubowicz <lszubowi@...hat.com>
> > Signed-off-by: David Arcari <darcari@...hat.com>
> > Cc: Rafael J. Wysocki <rjw@...ysocki.net>
> > Cc: Len Brown <lenb@...nel.org>
> > Cc: Tony Luck <tony.luck@...el.com>
> > Cc: Borislav Petkov <bp@...en8.de>
> > Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
> > Cc: Alexandru Gagniuc <mr.nuke.me@...il.com>
> > Cc: linux-kernel@...r.kernel.org
> > ---
> >  drivers/acpi/apei/ghes.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> > index 02c6fd9..f008ba7 100644
> > --- a/drivers/acpi/apei/ghes.c
> > +++ b/drivers/acpi/apei/ghes.c
> > @@ -691,6 +691,8 @@ static void __ghes_panic(struct ghes *ghes)
> >  {
> >  	__ghes_print_estatus(KERN_EMERG, ghes->generic, ghes->estatus);
> >  
> > +	ghes_clear_estatus(ghes);
> > +
> >  	/* reboot to log the error! */
> >  	if (!panic_timeout)
> >  		panic_timeout = ghes_panic_timeout;
> 
> Acked-by: Borislav Petkov <bp@...e.de>

Patch applied, thanks!