Urgent -- help needed diagnosing possible DMA conflict

Martin Langhoff martin at laptop.org
Sat Mar 17 10:53:44 EDT 2012


We have what looks like a fix for the Record crash! Yum update your
kernel and rsync the kernel+inird into place, and help us test :-)



m

On Sat, Mar 17, 2012 at 10:15 AM, Saadia Husain Baloch
<saadia at laptop.org> wrote:
> Jon C.
> These are definitely a breakthrough! I have not been able to crash Record
> (and I'm good at managing crashes), and there are no green screens of death
> either. Chris Ball has pushed them to our code tree so more people can test
> them as well.
> I have noticed one thing in the short testing I did this morning: the audio
> is garbled/unintelligible on these recorded segments. Let me see if anyone
> else is experiencing this, but I didn't have it before.
> Thank you for all your help
> -Saadia
>
>
> On Fri, Mar 16, 2012 at 6:51 PM, Jonathan Corbet <corbet at lwn.net> wrote:
>>
>> On Fri, 16 Mar 2012 14:53:58 -0600
>> Jonathan Corbet <corbet at lwn.net> wrote:
>>
>> > I want to pound on it for a bit longer, then I'll have a set of patches
>> > to
>> > send in.  Stay tuned...
>>
>> And now they are ready.  There's a whole set of stuff in my repo,
>> including the other bug fixes I've sent around, a couple you haven't seen
>> yet (including one for #11644), and, at the end of the series, the
>> demotion of the "Release" printk spam to debug level.
>>
>> With these patches in, I cannot make my machine crash no matter how hard I
>> try; I think the problems are truly stomped.  My apologies for creating
>> them in the first place and causing you to lose a lot of time.
>>
>> jon
>>
>> The following changes since commit
>> 943cd42c06440bbc139b775a73fbf55786e44087
>> are available in the git repository at:
>>
>>  git://git.lwn.net/linux-2.6.git olpc-camera-fixes
>>
>> for you to fetch changes up to 3b944fd17f650c9f589924f0f26de7c36c444516:
>>
>>  marvell-cam: Demote the "release" print to debug level (2012-03-16
>> 16:29:50 -0600)
>>
>> ----------------------------------------------------------------
>> Jonathan Corbet (7):
>>      marvell-cam: ensure that the camera stops when requested
>>      marvell-cam: Remove broken "owner" logic
>>      marvell-cam: Increase the DMA shutdown timeout
>>      marvell-cam: fix the green screen of death
>>      marvell-cam: Don't signal multiple frame completions in
>> scatter/gather mode
>>      mmp-camera: Don't power up the sensor on resume
>>      marvell-cam: Demote the "release" print to debug level
>>
>>  drivers/media/video/marvell-ccic/mcam-core.c  |   35
>> ++++++++++++++++--------
>>  drivers/media/video/marvell-ccic/mcam-core.h  |    1 -
>>  drivers/media/video/marvell-ccic/mmp-driver.c |   13 ++++++---
>>  3 files changed, 32 insertions(+), 17 deletions(-)
>
>



-- 
 martin at laptop.org -- Software Architect - OLPC
 - ask interesting questions
 - don't get distracted with shiny stuff  - working code first
 - http://wiki.laptop.org/go/User:Martinlanghoff


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