linux-kernel - Re: [PATCHv2] musb_host: fix lockup on rxcsr_h

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Date:   Mon, 6 Aug 2018 15:19:58 +0200
From:   Tomas Paukrt <tomas.paukrt@...antech-bb.cz>
To:     Maxim Uvarov <muvarov@...il.com>, Bin Liu <b-liu@...com>,
        Yegor Yefremov <yegorslists@...glemail.com>,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-usb <linux-usb@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        sergei.shtylyov@...entembedded.com
Subject: Re: [PATCHv2] musb_host: fix lockup on rxcsr_h_error

Hi Maxim and Bin,

I would like to reopen this issue, because we have moved to 4.12.24 and 
restarting two cellular modules using AT+CFUN=1,1 command at the same 
time leads to system freeze, because RX ISR is repeatedly invoked. Maybe 
*musb_start_urb* should be always called from *musb_advance_schedule* 
after a random communication error, but should not be called repeatedly 
if the device has been disconnected.

Best regards

Tomas


Dne 26.1.2018 v 11:42 Tomas Paukrt napsal(a):
> Hi Maxim,
>
> unfortunately we cannot test the latest kernel right now, because we 
> have custom drivers and additional changes that need to be ported, but 
> the MUSB driver in our kernel should contain all fixes from 
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/log/drivers/usb/musb
>
> Best regards
>
> Tomas
>
>
> Dne 25.1.2018 v 17:24 Maxim Uvarov napsal(a):
>> [1] says that issue is with back ported driver to 3.12.10. Can the
>> latest kernel be tested on the same hw?
>>
>> Maxim.
>>
>> 2018-01-25 18:45 GMT+03:00 Bin Liu <b-liu@...com>:
>>> Hi Yegor and Max,
>>>
>>> On Tue, May 03, 2016 at 04:25:58PM +0200, Yegor Yefremov wrote:
>>>> On Tue, May 3, 2016 at 3:48 PM, Bin Liu <b-liu@...com> wrote:
>>>>> Hi,
>>>>>
>>>>> On Tue, May 03, 2016 at 12:03:52PM +0200, Yegor Yefremov wrote:
>>>>>> On Thu, Apr 28, 2016 at 4:37 PM, Bin Liu <b-liu@...com> wrote:
>>>>>>> Hi,
>>>>>>>
>>>>>>> On Thu, Apr 28, 2016 at 09:51:37AM +0300, Maxim Uvarov wrote:
>>>>>>>
>>>>>>> [snip]
>>>>>>>
>>>>>>>> Hello Bin,
>>>>>>>>
>>>>>>>> yes, it also works with that reset and go to finish:
>>>>>>>>
>>>>>>>> diff --git a/drivers/usb/musb/musb_host.c 
>>>>>>>> b/drivers/usb/musb/musb_host.c
>>>>>>>> index c3d5fc9..8cd98e7 100644
>>>>>>>> --- a/drivers/usb/musb/musb_host.c
>>>>>>>> +++ b/drivers/usb/musb/musb_host.c
>>>>>>>> @@ -1599,6 +1599,10 @@ void musb_host_rx(struct musb *musb, u8 
>>>>>>>> epnum)
>>>>>>>>                  status = -EPROTO;
>>>>>>>>                  musb_writeb(epio, MUSB_RXINTERVAL, 0);
>>>>>>>>
>>>>>>>> +               rx_csr &= ~MUSB_RXCSR_H_ERROR;
>>>>>>>> +               musb_writew(epio, MUSB_RXCSR, rx_csr);
>>>>>>>> +
>>>>>>>> +               goto finish;
>>>>>>>>          } else if (rx_csr & MUSB_RXCSR_DATAERROR) {
>>>>>>>>
>>>>>>>>                  if (USB_ENDPOINT_XFER_ISOC != qh->type) {
>>>>>>>>
>>>>>>> Thanks for testing it.
>>>>>> Have tested your patch and now both FT4232 and Huawei don't 
>>>>>> freeze on removal.
>>>>>>
>>>>>> Bin, Max thanks for fixing this issue.
>>>>>>
>>>>>> Tested-by: Yegor Yefremov <yegorslists@...glemail.com>
>>>>> Thanks for testing.
>>>>>
>>>>> Can you please test the patch [1] instead? I'd like to use it as the
>>>>> fix.
>>>>>
>>>>> [1] http://marc.info/?l=linux-usb&m=146222355213935&w=2
>>>> The patch behaves the same as the previous one.
>>> Sorry for bringing up this old thread, but it seems to be too 
>>> aggressive
>>> to stop scheduling further urbs on errors [1]. So is it possible for 
>>> you
>>> to re-test your usecase by reverting commit
>>>
>>>      dbac5d07d13e ("usb: musb: host: don't start next rx urb if 
>>> current one failed")
>>>
>>> to see if only commit
>>>
>>>      b5801212229f ("usb: musb: host: clear rxcsr error bit if set")
>>>
>>> itself solves your issue?
>>>
>>> I know you have tested the patch in [2], which is similar to commit
>>> b5801212229f, but tha latter doesn't have 'goto finish' which does dma
>>> cleanup on errors, it makes more sense to me. But I'd like to have you
>>> tested with reverting dbac5d07d13e to be sure.
>>>
>>> [1] https://marc.info/?l=linux-usb&m=151689238420622&w=2
>>> [2] https://marc.info/?l=linux-kernel&m=146185425805967&w=2
>>>
>>> thanks,
>>> -Bin.
>>>
>>
>>
>