usb: gadget: f_acm: don't disable disabled EP

Make debugging real problems easier by not trying to disable an EP that
was not yet enabled.

Reviewed-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

diff --git a/drivers/usb/gadget/function/f_acm.c b/drivers/usb/gadget/function/f_acm.c
index 200596e..46647bf 100644 (file)
--- a/drivers/usb/gadget/function/f_acm.c
+++ b/drivers/usb/gadget/function/f_acm.c
@@ -425,9 +425,11 @@ static int acm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
        /* we know alt == 0, so this is an activation or a reset */
 
        if (intf == acm->ctrl_id) {
-               dev_vdbg(&cdev->gadget->dev,
-                               "reset acm control interface %d\n", intf);
-               usb_ep_disable(acm->notify);
+               if (acm->notify->enabled) {
+                       dev_vdbg(&cdev->gadget->dev,
+                                       "reset acm control interface %d\n", intf);
+                       usb_ep_disable(acm->notify);
+               }
 
                if (!acm->notify->desc)
                        if (config_ep_by_speed(cdev->gadget, f, acm->notify))