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Groups > linux.kernel > #1211033

[PATCH] usb: gadget: fix possible regression introduced with ep->claimed

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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@ti.com>
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
---

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
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.

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

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[PATCH] usb: gadget: fix possible regression introduced with  ep->claimed Robert Baldyga <r.baldyga@samsung.com> - 2015-08-21 11:10 +0200
  Re: [PATCH] usb: gadget: fix possible regression introduced with  ep->claimed Felipe Balbi <balbi@ti.com> - 2015-08-21 17:10 +0200
    Re: [PATCH] usb: gadget: fix possible regression introduced with  ep->claimed Felipe Balbi <balbi@ti.com> - 2015-08-21 22:30 +0200

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