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

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Message-ID: <20160504185638.GB4327@uda0271908>
Date:	Wed, 4 May 2016 13:56:38 -0500
From:	Bin Liu <b-liu@...com>
To:	Yegor Yefremov <yegorslists@...glemail.com>
CC:	Maxim Uvarov <muvarov@...il.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,

On Wed, May 04, 2016 at 04:49:50PM +0200, Yegor Yefremov wrote:
> On Tue, May 3, 2016 at 4:35 PM, Bin Liu <b-liu@...com> wrote:
> > Hi,
> >
> > 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.
> >>
> >> Kernel: 4.6-rc6
> >
> > Thanks for testing. I will add your Tested-by.
> 
> If you'll resend this patch, it would be good to add it to stable
> kernels. I've tested 3.18.32 and it fixes the error too.
> 

Thanks for testing.

My plan is to not rush it into stable, but let it sit in v4.7 for a
while first.

Regards,
-Bin.