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.
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;
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