[PATCH v5 01/46] usb: gadget: encapsulate endpoint claiming mechanism

just letting you know that this regresses all gadget drivers making them
try to disable previously disabled endpoints and enable previously
enabled endpoints.

I have a possible fix (see below) but then it shows a problem on the
host side when using with g_zero (see further below):

commit 3b8932100aacb6cfbffe288ca93025d8b8430c00
Author: Felipe Balbi [off-list ref]
Date:   Wed Aug 19 18:05:27 2015 -0500

     usb: gadget: fix ep->claimed lifetime

     In order to fix a regression introduced by commit
     cc476b42a39d ("usb: gadget: encapsulate endpoint
     claiming mechanism") we have to introduce a simple
     helper to check if a particular is enabled or not.

     After that, we need to move ep->claimed lifetime to
     usb_ep_enable() and usb_ep_disable() since those
     are the only functions which actually enable and
     disable endpoints.

     A follow-up patch will come to drop all driver_data
     checks from function drivers, since those are, now,
     pointless.

     Fixes: cc476b42a39d ("usb: gadget: encapsulate endpoint
     	claiming mechanism")
     Cc: Robert Baldyga [off-list ref]
     Signed-off-by: Felipe Balbi [off-list ref]

diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c
index 978435a51038..ad45070cd76f 100644
--- a/drivers/usb/gadget/epautoconf.c
+++ b/drivers/usb/gadget/epautoconf.c

@@ -126,7 +126,6 @@ found_ep:
  	ep->address = desc->bEndpointAddress;
  	ep->desc = NULL;
  	ep->comp_desc = NULL;
-	ep->claimed = true;