linux-kernel - Re: [PATCH RESEND] x86:pci: Change sta2x11_dma_ops stucture to use switolb_dma_supported as it's dma

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Message-ID: <20150216075506.GA25780@gmail.com>
Date:	Mon, 16 Feb 2015 08:55:06 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Nicholas Krause <xerofoify@...il.com>
Cc:	bhelgaas@...gle.com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org, --cclinux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] x86:pci: Change  sta2x11_dma_ops stucture to use
 switolb_dma_supported as it's dma_supported function in sta2x11-fixup.c


* Nicholas Krause <xerofoify@...il.com> wrote:

> This changes the structure sta2x11_dma_ops stucture to 
> use switolb_dma_supported as it's function for 
> dma_supported hardware verus setting this value to NULL 
> as this should be set correctly for when dma_supported 
> function needs to be called for this hardware. Otherwise 
> this will cause a bug that will crash a operation needing 
> to access this function if an intended hardware operation 
> needs to call it but the kernel has the function pointer 
> for this structure set to NULL incorrectly.

This is a pretty vague description - what specific hardware 
is affected and how is the bug triggered?

Thanks,

	Ingo
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