linux-kernel - Re: b44 driver causes panic when using swiotlb

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Date:	Mon, 31 Jan 2011 08:36:39 -0800
From:	Andi Kleen <ak@...ux.intel.com>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	linux-kernel@...r.kernel.org, David Woodhouse <dwmw2@...radead.org>
Subject: Re: b44 driver causes panic when using swiotlb

On Mon, Jan 31, 2011 at 10:54:12AM -0500, Chuck Ebbert wrote:
> The b44 driver is triggering this panic in swiotlb_map_page():
> 
>         if (!dma_capable(dev, dev_addr, size))
>                 panic("map_single: bounce buffer is not DMA'ble");
> 
> The kernel log says the bounce buffers are at 0xdb400000, but b44 can
> only do DMA to the first 1GB of memory:

b44 needs to use GFP_DMA then and do its own custom bouncing. 
The standard pci_map_* bounce buffering is only designed for at least
32bit capable devices.

BTW I'm pretty sure this worked at some point, must have regressed 
somehow.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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