Re: [PATCH 2/2] usb: musb: Fix DMA desired mode for Mentor DMA engine

[Joshua Henderson]

Sergei,

On 02/02/2016 06:32 AM, Sergei Shtylyov wrote:
> On 2/2/2016 3:37 AM, Joshua Henderson wrote:
> 
>> From: Cristian Birsan <cristian.birsan@xxxxxxxxxxxxx>
>>
>> Commit 6b6e97107f12f3a9f7 (USB: musb: fix isochronous TXDMA (take 2)) introduces
> 
>    Again, wrong commit style. And I really doubt that blaming my commit was correct. :-)

I apologize.  I noticed you added the line in question, but did not notice the variable type of "mode" changed *afterward*.  Completely my fault.  I shall also fix the commit message style.

> 
>> a problem setting the desired channel mode for the Mentor DMA engine.
>>
>> There is a case where the pointer of the channel DMA mode is incorrectly
>> assigned to a pointer value, when it should be assigned the actual mode value.
>> This results in the value of channel->desired_mode not being correct.
>>
>> Signed-off-by: Cristian Birsan <cristian.birsan@xxxxxxxxxxxxx>
>> Signed-off-by: Joshua Henderson <joshua.henderson@xxxxxxxxxxxxx>
>> ---
>>   drivers/usb/musb/musb_host.c |    2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
>> index 3fdc99b..748379e 100644
>> --- a/drivers/usb/musb/musb_host.c
>> +++ b/drivers/usb/musb/musb_host.c
>> @@ -662,7 +662,7 @@ static int musb_tx_dma_set_mode_mentor(struct dma_controller *dma,
> 
>    Hm, there was no such function at the time of my commit...
> 
>>           csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
>>           csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */
>>       }
>> -    channel->desired_mode = mode;
>> +    channel->desired_mode = *mode;
> 
>   'mode' was 'u8' at the time of my commit, see:
> 
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6b6e97107f12f3a9f7b5b43a6c3b94409240bcff
> 
>    I think that the recent commit below should be blamed instead:
> 
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=754fe4a92c072a6e36d89fa328ed789c9ebc1af5

I'll take a look at this and make sure.

Thanks,
Josh