linux-kernel - Re: [PATCH] usb: dwc3: be more verbose on ERRATIC

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Message-ID: <20141015170145.GC4529@psi-dev26.jf.intel.com>
Date:	Wed, 15 Oct 2014 10:01:45 -0700
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	Felipe Balbi <balbi@...com>
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: dwc3: be more verbose on ERRATIC_ERROR interrupt

On Wed, Oct 15, 2014 at 09:57:18AM -0700, David Cohen wrote:
> On Wed, Oct 15, 2014 at 12:00:22AM -0500, Felipe Balbi wrote:
> > Hi,
> > 
> > On Tue, Oct 14, 2014 at 01:15:05PM -0700, David Cohen wrote:
> > > ERRATIC_ERROR interrupt is an event that needs more attention from
> > > developers than currently implemented, since this indicates a serious
> > > stability issue. The only way to get warned about it is by selecting the
> > > maximum driver's verbosity.
> > > 
> > > This patch increases a bit the error's verbosity.
> > > 
> > > Signed-off-by: David Cohen <david.a.cohen@...ux.intel.com>
> > > ---
> > >  drivers/usb/dwc3/gadget.c | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> > > index 3818b26bfc05..132e761d62e4 100644
> > > --- a/drivers/usb/dwc3/gadget.c
> > > +++ b/drivers/usb/dwc3/gadget.c
> > > @@ -2484,7 +2484,8 @@ static void dwc3_gadget_interrupt(struct dwc3 *dwc,
> > >  		dev_vdbg(dwc->dev, "Start of Periodic Frame\n");
> > >  		break;
> > >  	case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
> > > -		dev_vdbg(dwc->dev, "Erratic Error\n");
> > > +		WARN_ON_ONCE(1);
> > > +		dev_dbg(dwc->dev, "Erratic Error\n");
> > 
> > how about:
> > 		WARN_ONCE(true, "Erratic Error\n");
> > 
> > instead ?
> 
> When erratic error event happens, in my experience it is usually
> followed but many of them in a row. It may end up too verbose.

Oops, sorry for my confusion. I read WARN(), not WARN_ONCE() when I read
for the first time :)

I let the dev_dbg() because it may be useful to get all the occurrences
in case debug is enabled. But WARN_ONCE() is fine too if you prefer.

Br, David

> 
> Br, David
> 
> > 
> > >  		break;
> > >  	case DWC3_DEVICE_EVENT_CMD_CMPL:
> > >  		dev_vdbg(dwc->dev, "Command Complete\n");
> > > -- 
> > > 2.1.0
> > > 
> > 
> > -- 
> > balbi
> 
> 
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