Re: [PATCH] usb: dwc3: gadget: fix burst size corruption

[Felipe Balbi]

Hi,

On Thu, May 01, 2014 at 09:45:17AM -0400, Alan Stern wrote:
> On Thu, 1 May 2014, Zhuang Jin Can wrote:
> 
> > > again, you found a bug on the gadget driver. Fix that. composite.c
> > > guarantees that for those functions which don't pass bMaxBurst,
> > > gadget->maxburst will be set to *at least* 1.
> > > 
> > I agree the real fix should be in the gadget driver. The patch intents
> > to prevent hibernatition from being corrupted by a bad gadget driver.
> > If OEMs develop their own gadget driver forgetting to call
> > config_ep_by_speed(), it'll turn out to be everything works except
> > dwc3 hibernation, and they'll complain to dwc3. f_ffs is an
> > example has SuperSpeed support but doesn't call config_ep_by_speed().
> > It's just for robustness, and dwc3 is not doing anything wrong.
> > It did cause me a long time to figure out why the hibernation was broken.
> 
> You could include the check, for the sake of robustness, in dwc3 -- but
> if it fails, you should write a message to the kernel log saying that
> the gadget driver needs to be fixed.

Also, if we're adding something to dwc3, we need to add to other
USB3-capable UDCs too. Namely dummy and marvel's.

cheers

-- 
balbi

Attachment: signature.asc
Description: Digital signature