On Fri, Aug 21, 2015 at 11:01:29AM +0200, Robert Baldyga wrote:
> This patch fixes possible regression introduced by patch reworking endpoint
> claiming mechanism. It restores setring ep->driver_data to NULL in
> usb_ep_autoconfig_reset(), which was removed by patch [1].
>
> [1] commit cc476b42a39d ("usb: gadget: encapsulate endpoint claiming
> mechanism")
>
> Reported-by: Felipe Balbi <balbi@xxxxxx>
> Signed-off-by: Robert Baldyga <r.baldyga@xxxxxxxxxxx>
> ---
>
> Hi Felipe,
>
> I was not able to reproduce the problem that you have described (functions
> trying to enable eps that are already enabled, and disable eps that are
> already disabled), but I have analysed the problem and I have concluded
it happens with all, you can't see it because dwc3 (only) has a WARN()
for when an endpoint is enabled and has previously been enabled
(drivers/usb/dwc3/gadget.c). If you track your endpoint's state
regarding being enabled or not, you can add a WARN() to see the error.
> that the only possible cause of regression can be that my patch removed
> setting ep->driver_data to NULL in usb_ep_autoconfig_reset() function.
> Because of this change initial state of ep->driver_data could be non-NULL
> value, which could change behavoiur of some functions. I can't imagine
> any other possible cause of regression introduced by such simple patch.
yeah, I'll test this later.
>
> Thanks,
> Robert
>
> drivers/usb/gadget/epautoconf.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c
> index 978435a..6399c10 100644
> --- a/drivers/usb/gadget/epautoconf.c
> +++ b/drivers/usb/gadget/epautoconf.c
> @@ -186,6 +186,7 @@ void usb_ep_autoconfig_reset (struct usb_gadget *gadget)
>
> list_for_each_entry (ep, &gadget->ep_list, ep_list) {
> ep->claimed = false;
> + ep->driver_data = NULL;
> }
> gadget->in_epnum = 0;
> gadget->out_epnum = 0;
> --
> 1.9.1
>
--
balbi
Attachment:
signature.asc
Description: Digital signature
