linux-kernel - Re: [PATCH] efi/capsule: Make efi_capsule

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Message-ID: <20160504114605.GH2839@codeblueprint.co.uk>
Date:	Wed, 4 May 2016 12:46:05 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Borislav Petkov <bp@...en8.de>
Cc:	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Kweh Hock Leong <hock.leong.kweh@...el.com>,
	Bryan O'Donoghue <pure.logic@...us-software.ie>,
	joeyli <jlee@...e.com>
Subject: Re: [PATCH] efi/capsule: Make efi_capsule_pending() lockless

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.