[Precise PATCH] USB: Fix 'bad dma' problem on WDM device disconnect

[Leann Ogasawara]

On 12/12/2012 08:33 PM, Ming Lei wrote:
> Hi Leann,
>
> On Thu, Dec 13, 2012 at 1:29 AM, Leann Ogasawara
> <leann.ogasawara at canonical.com> wrote:
>> Hi Ming,
>>
>> I'm a little confused here.  This patch was included upstream as of 2.6.39:
>>
>> ~/linux$ git show 878b753e32ca765cd346a5d3038d630178ec78ff
>> commit 878b753e32ca765cd346a5d3038d630178ec78ff
>> Author: Robert Lukassen <Robert.Lukassen at tomtom.com>
>> Date:   Wed Mar 16 12:13:34 2011 +0100
>>
>>     USB: Fix 'bad dma' problem on WDM device disconnect
>>
>> ~/linux$ git describe --contains 878b753e32ca765cd346a5d3038d630178ec78ff
>> v2.6.39-rc1~85^2~3
>>
>> Thus, this patch is already available in Precise by default.  Am I
>> missing something here?  Have you tested with a stock Precise kernel?
> You are correct, looks I miss that, and the root cause is the below commit,
> which is a partial fix, so we still need the patch to avoid the 'bad dma' and
> coherent buffer leak. The patch isn't needed for upstream kernel, so need to
> push it to stable tree first or you can apply it directly on precise?
>
> commit 7a55df4694e1758a7a1c3b1432e36fca0c859d6a
> Author: Bjørn Mork <bjorn at mork.no>
> Date:   Mon Jan 16 15:11:59 2012 +0100
>
>     USB: cdc-wdm: better allocate a buffer that is at least as big as
> we tell the USB core

I'm still a little confused... The above patch is also already in
Precise.  We pulled it in via upstream stable.

~/ubuntu-precise$ git describe --contains
7a55df4694e1758a7a1c3b1432e36fca0c859d6a
v3.2.3~23

Thanks,
Leann