From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1752436AbcEDLqK (ORCPT <rfc822;w@1wt.eu>);
	Wed, 4 May 2016 07:46:10 -0400
Received: from mail-wm0-f49.google.com ([74.125.82.49]:36766 "EHLO
	mail-wm0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751625AbcEDLqI (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 4 May 2016 07:46:08 -0400
Date: Wed, 4 May 2016 12:46:05 +0100
From: Matt Fleming <matt@codeblueprint.co.uk>
To: Borislav Petkov <bp@alien8.de>
Cc: linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Kweh Hock Leong <hock.leong.kweh@intel.com>,
        "Bryan O'Donoghue" <pure.logic@nexus-software.ie>,
        joeyli <jlee@suse.com>
Subject: Re: [PATCH] efi/capsule: Make efi_capsule_pending() lockless
Message-ID: <20160504114605.GH2839@codeblueprint.co.uk>
References: <1462054407-9735-1-git-send-email-matt@codeblueprint.co.uk>
 <20160503090229.GC27540@pd.tnic>
 <20160503141201.GW2839@codeblueprint.co.uk>
 <20160504093031.GA4074@pd.tnic>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20160504093031.GA4074@pd.tnic>
User-Agent: Mutt/1.5.24+41 (02bc14ed1569) (2015-08-30)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Wed, 04 May, at 11:30:31AM, Borislav Petkov wrote:
> 
> Hmmm, so panic() does bust_spinlocks() and efi_capsule_pending() could
> look at oops_in_progress which is set by bust_spinlocks() and that would
> probably solve the panic case but maybe the normal reboot case would
> still hang...
 
But emergency_restart() is called after bust_spinlocks(0) which can
reset oops_in_progress, so can't even use that to solve the panic
case.