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@xxxxxxxxxxx> > >>--- > >> 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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