[PATCH] usb: gadget: f_acm: don't disable disabled EP

[Michał Mirosław]

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

Fixes: 4aab757ca44a ("usb: gadget: f_acm: eliminate abuse of ep->driver data")
Signed-off-by: Michał Mirosław <mirq-li...@rere.qmqm.pl>
---
 drivers/usb/gadget/function/f_acm.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/function/f_acm.c 
b/drivers/usb/gadget/function/f_acm.c
index 200596ea9557..46647bfac2ef 100644
--- 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))
-- 
2.20.1