lkml.org 
[lkml]   [2011]   [Feb]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: b44 driver causes panic when using swiotlb
From
On Tue, Feb 1, 2011 at 12:07 PM, Andi Kleen <ak@linux.intel.com> wrote:
> On Mon, Jan 31, 2011 at 06:54:21PM -0600, Robert Hancock wrote:
>> On 01/31/2011 10:36 AM, Andi Kleen wrote:
>> >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.
>>
>> That seems wrong - it's a documented API and that restriction isn'
>
> Please read the documentation. When PCI DMA cannot handle it
> it returns failure. That is what happened here.

Apparently not, given that it hit a panic inside the swiotlb code..
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2011-02-01 22:47    [W:0.099 / U:27.464 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site