usb: gadget: add usb_endpoint_descriptor to struct usb_ep

Change usb_ep_enable() prototype to use endpoint
descriptor from usb_ep.

This optimization spares the FDs from saving the
endpoint chosen descriptor. This optimization is
not full though. To fully exploit this change, one
needs to update all the UDCs as well since in the
current implementation each of them saves the
endpoint descriptor in it's internal (and extended)
endpoint structure.

Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/usb/gadget/f_uvc.c b/drivers/usb/gadget/f_uvc.c
index be446b7e7eaa..df74d0311910 100644
--- a/drivers/usb/gadget/f_uvc.c
+++ b/drivers/usb/gadget/f_uvc.c
@@ -262,8 +262,10 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
                 if (uvc->state != UVC_STATE_CONNECTED)
                         return 0;
 
-                if (uvc->video.ep)
-                        usb_ep_enable(uvc->video.ep, &uvc_streaming_ep);
+                if (uvc->video.ep) {
+                        uvc->video.ep->desc = &uvc_streaming_ep;
+                        usb_ep_enable(uvc->video.ep);
+                }
 
                 memset(&v4l2_event, 0, sizeof(v4l2_event));
                 v4l2_event.type = UVC_EVENT_STREAMON;