linux-kernel - Re: [PATCH] DMA: Correct invalid assumptions in the Kconfig text

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Message-ID: <e9c3a7c20710271110s4c8c2654qc11ecf2054eb0492@mail.gmail.com>
Date:	Sat, 27 Oct 2007 11:10:29 -0700
From:	"Dan Williams" <dan.j.williams@...el.com>
To:	"Haavard Skinnemoen" <hskinnemoen@...el.com>
Cc:	"Shannon Nelson" <shannon.nelson@...el.com>,
	linux-kernel@...r.kernel.org,
	"David Brownell" <david-b@...bell.net>, kernel@...32linux.org,
	linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [PATCH] DMA: Correct invalid assumptions in the Kconfig text

On 10/27/07, Haavard Skinnemoen <hskinnemoen@...el.com> wrote:
>
> Yeah, it's a pretty serious bug if the DMA engine flags an error. But
> wouldn't it be better to BUG() in the context of the caller? That way,
> you won't necessarily bring down the whole system.
>

I see your point...  We could track the caller's task_struct in
dma_async_tx_descriptor, and deliver a SIGBUS in the case of an error.
 It limits the client's recovery options, but at least the damaged is
localized to the correct process.  I need to go read up on what this
would imply for kernel threads like raid5d...
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