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
>> Regards,
>> -Bin.
>>
>> -----8<---------
>> diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
>> index 2f8ad7f..9b2553c 100644
>> --- a/drivers/usb/musb/musb_host.c
>> +++ b/drivers/usb/musb/musb_host.c
>> @@ -1551,7 +1551,7 @@ static int musb_rx_dma_iso_cppi41(struct
>> dma_controller *dma,
>> struct urb *urb,
>> size_t len)
>> {
>> - struct dma_channel *channel = hw_ep->tx_channel;
>> + struct dma_channel *channel = hw_ep->rx_channel;
>> void __iomem *epio = hw_ep->regs;
>> dma_addr_t *buf;
>> u32 length, res;
>>
>
>
>
> --
> With best regards,
> Matwey V. Kornilov.
> Sternberg Astronomical Institute, Lomonosov Moscow State University, Russia
> 119991, Moscow, Universitetsky pr-k 13, +7 (495) 9392382
--
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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