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

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Date:	Wed, 11 Jun 2008 01:57:30 -0400
From:	"Miles Lane" <miles.lane@...il.com>
To:	"Larry Finger" <Larry.Finger@...inger.net>
Cc:	"Michael Buesch" <mb@...sch.de>,
	"Vegard Nossum" <vegard.nossum@...il.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	"FUJITA Tomonori" <fujita.tomonori@....ntt.co.jp>
Subject: Re: BUG: NULL pointer dereference at 00000000 -- IP: [<f8e783d5>] :b43:b43_dma_mapping_error+0x16/0x155

> The line that fails is
>
> if (unlikely(dma_mapping_error(ring->dev->dev->dma_dev, addr)))
>
> The value at 0x58(%eax) is zero, which corresponds to the "struct b43_wldev
> *dev" line in struct b43_dmaring. In other words, ring->dev is NULL, which
> causes the error. I'll leave it to FUJITA Tomonori to figure out why.

Thanks all,

I might have time in the morning to test one more patch, otherwise I
will be back in about three weeks.

Best wishes,

        Miles
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