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Subject[PATCH] 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.

Fixes: 4aab757ca44a ("usb: gadget: f_acm: eliminate abuse of ep->driver data")
Signed-off-by: Michał Mirosław <mirq-linux@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
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