linux-kernel - Re: BUG: NULL pointer dereference at 00000000 -- IP: [<f8e783d5>] :b43:b43_dma_mapping

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Date:	Thu, 12 Jun 2008 11:14:53 +0200
From:	Michael Buesch <mb@...sch.de>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	vegard.nossum@...il.com, miles.lane@...il.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: BUG: NULL pointer dereference at 00000000 -- IP: [<f8e783d5>] :b43:b43_dma_mapping_error+0x16/0x155

On Thursday 12 June 2008 07:18:32 FUJITA Tomonori wrote:
> > Yeah ok. That's an unlikely error path.
> 
> Yeah, it doesn't always happen, but it possible that it happens?

Yes. I will create a new patch and send it to John Linville.
So it will also quickly end up in the -mm tree, too.
This will fix both bugs.

> No, seems that there are some confusion. This is just in -mm to find
> problems:
> 
> http://userweb.kernel.org/~akpm/mmotm/broken-out/dma-mapping-add-the-device-argument-to-dma_mapping_error.patch
> 
> This patch is a trivial but changes lots of places. So it's difficult
> to get an ACK on all the places.

Thanks a lot for explaining this. This makes things a lot easier.

> This patch need several fixes but all the patches are trivial except
> for b34. I guess that it is because b34 handles devices for

It's called b43 ;)

> dma-mapping in an uncommon way.

Yeah, the hardware is pretty stupid, so we have lots of special workarounds
and so on... So I hardly touch the DMA code and was very surprised about
this bugreport. :)

-- 
Greetings Michael.
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