linux-kernel - Re: [PATCH 2/3] x86/sysfb_efi: Fix valid BAR address range check

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Message-ID: <20160504092510.GD2839@codeblueprint.co.uk>
Date:	Wed, 4 May 2016 10:25:10 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H . Peter Anvin" <hpa@...or.com>,
	Wang YanQing <udknight@...il.com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	David Herrmann <dh.herrmann@...il.com>,
	Peter Jones <pjones@...hat.com>, stable@...r.kernel.org,
	Tomi Valkeinen <tomi.valkeinen@...com>
Subject: Re: [PATCH 2/3] x86/sysfb_efi: Fix valid BAR address range check

On Wed, 04 May, at 08:35:24AM, Ingo Molnar wrote:
> 
> * Matt Fleming <matt@...eblueprint.co.uk> wrote:
> 
> > From: Wang YanQing <udknight@...il.com>
> > 
> > We can't just break out when meet start is equal to zero,
> 
> Hm, wot?

The existing code treats address 0x0 as invalid for a PCI BAR range
start address, but 0x0 is actually possible and legitimate, so we
shouldn't be breaking out of the loop.