Re: [PATCH 3/9] usb: dwc2/gadget: fix support for soft_connect udc framework feature

[Felipe Balbi <balbi@ti.com>]

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On Fri, Oct 17, 2014 at 12:43:48PM +0200, Marek Szyprowski wrote:
> Hello,
> 
> On 2014-10-16 15:36, Felipe Balbi wrote:
> >On Thu, Oct 16, 2014 at 02:57:59PM +0200, Marek Szyprowski wrote:
> >>Enabling and disabling usb gadget by writing to
> >>/sys/class/udc/*hsotg/soft_connect results in calling udc_start/udc_stop
> >>functions with the same usb gadget driver, so the driver should not WARN
> >>about such case.
> >>
> >>Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> >>---
> >>  drivers/usb/dwc2/gadget.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >>diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
> >>index 8870e38c1d82..37fda4c03397 100644
> >>--- a/drivers/usb/dwc2/gadget.c
> >>+++ b/drivers/usb/dwc2/gadget.c
> >>@@ -2892,7 +2892,7 @@ static int s3c_hsotg_udc_start(struct usb_gadget *gadget,
> >>  		return -EINVAL;
> >>  	}
> >>-	WARN_ON(hsotg->driver);
> >>+	WARN_ON(hsotg->driver && hsotg->driver != driver);
> >the bug is in your ->udc_stop(). You should clear hsotg->driver to NULL
> >there.
> 
> Ok, I will change udc_stop() to always zero hsotg->driver, like other udc
> drivers. I was a bit confused by the fact that udc core passes driver to
> udc_stop(), when called from soft_connect and NULL on gadget removal.

That can probably be cleaned up, I'll go have a look on all UDCs and
make sure I won't break anything.

-- 
balbi

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