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

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Date:	Fri, 26 Oct 2007 10:02:24 -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 10/25/07, Haavard Skinnemoen <hskinnemoen@...el.com> wrote:
> On Wed, 24 Oct 2007 20:16:16 +0200
> Haavard Skinnemoen <hskinnemoen@...el.com> wrote:
>
> > [handwaving about API extensions]
>
> Oh, and we definitely need a way to report errors. Looks like the
> existing drivers want this as well -- I couldn't help but notice this
> in the iop-adma driver:
>
> static irqreturn_t iop_adma_err_handler(int irq, void *data)
> {
>         (...)
>
>         BUG();
> }
>
> That's a panic waiting to happen, isn't it?

Yes, and it should have a comment, because for now this is deliberate.
 This was primarily driven by the fact that MD has no way of
recovering from hardware errors during software-memcpy or
software-xor_blocks so there was no where to plug-in
accelerated-memcpy/xor error recovery.  I can foresee other clients
wanting to have this information reported but async_tx based clients
are supposed to be blissfully unaware of under the covers hardware
acceleration.

One idea is to pass an error-pointer as the parameter to callback
routines, but that would hamper the client's ability to recover the
context of the failure...

>
> Håvard

--
Dan
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