Re: [OOPS] cppi41_dma_channel_program: Unable to handle kernel NULL pointer dereference

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2016-05-23 16:36 GMT+03:00 Bin Liu <b-liu@xxxxxx>:
> Hi,
>
> On Sat, May 21, 2016 at 10:04:48PM +0300, Matwey V. Kornilov wrote:
>> 2016-05-21 20:50 GMT+03:00 Matwey V. Kornilov <matwey@xxxxxxxxxx>:
>> > 2016-05-21 6:13 GMT+03:00 Bin Liu <binmlist@xxxxxxxxx>:
>> >> Hi,
>> >>
>> >> On Fri, May 20, 2016 at 4:20 PM, Matwey V. Kornilov <matwey@xxxxxxxxxx> wrote:
>> >>> 2016-05-21 0:12 GMT+03:00 Bin Liu <b-liu@xxxxxx>:
>> >>>> Hi,
>> >>>>
>> >>>> On Sat, May 21, 2016 at 12:05:06AM +0300, Matwey V. Kornilov wrote:
>> >>>>> By the way, is it ok that function musb_rx_dma_iso_cppi41 uses
>> >>>>> hw_ep->tx_channel? I would suppose that it should use rx_channel
>> >>>>> instead.
>> >>>>
>> >>>> I just got here, and am wondering the same. But the question is why just
>> >>>> your case hit the problem. I will try to look at it more next week.
>> >>>>
>> >>>> I had an impression the linux-usb@ has a discussion before about
>> >>>> rx/tx-channel messing up, will have to look it up.
>> >>>>
>> >>>
>> >>> Thank you.
>> >>> If you need additional info, I can use kgdb with this issue.
>> >>
>> >> After reviewed the code, it must be hw_ep->rx_channel instead. It is likely a
>> >> bug caused by commit 069a3fd (usb: musb: Remove ifdefs for musb_host_rx
>> >> in musb_host.c part1). Please test with the following patch.
>> >>
>> >
>> > I've just tested this patch. Indeed, it helps to avoid kernel panic.
>> > Now, I can interact with my webcam and watch video-stream in  xawtv.
>> > It would be great if the patch could become a part of 4.6.x stable tree.
>> >
>>
>> Hm, the following string appeared one time during my testing:
>>
>> [  867.017179] musb_host_rx 1925: RX14 dma busy, csr 2020
>
> This seems to be a different issue. Does your webcam still functional
> after the log shows up?

It seems so, but I am not sure completely, unfortunately this message
has stochastic origin.
So, I will try to reproduce it again and then report additional info.

>
> Regards,
> -Bin.
>



-- 
With best regards,
Matwey V. Kornilov.
Sternberg Astronomical Institute, Lomonosov Moscow State University, Russia
119991, Moscow, Universitetsky pr-k 13, +7 (495) 9392382
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