[backport] usb: gadget: function: acm: make f_acm pass USB20CV Chapter9

Message ID 1415631400-23406-1-git-send-email-balbi@ti.com
State New
Headers show

Commit Message

Felipe Balbi Nov. 10, 2014, 2:56 p.m.
[ Upstream commit 52ec49a5e56a27c5b6f8217708783eff39f24c16 ]

During Halt Endpoint Test, our interrupt endpoint
will be disabled, which will clear out ep->desc
to NULL. Unless we call config_ep_by_speed() again,
we will not be able to enable this endpoint which
will make us fail that test.

Fixes: f9c56cd (usb: gadget: Clear usb_endpoint_descriptor
	inside the struct usb_ep on disable)
Cc: <stable@vger.kernel.org> # v3.4+
Signed-off-by: Felipe Balbi <balbi@ti.com>
 drivers/usb/gadget/function/f_acm.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)


diff --git a/drivers/usb/gadget/function/f_acm.c b/drivers/usb/gadget/function/f_acm.c
index ab1065a..3384486 100644
--- a/drivers/usb/gadget/function/f_acm.c
+++ b/drivers/usb/gadget/function/f_acm.c
@@ -430,11 +430,12 @@  static int acm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 		if (acm->notify->driver_data) {
 			VDBG(cdev, "reset acm control interface %d\n", intf);
-		} else {
-			VDBG(cdev, "init acm ctrl interface %d\n", intf);
+		}
+		if (!acm->notify->desc)
 			if (config_ep_by_speed(cdev->gadget, f, acm->notify))
 				return -EINVAL;
-		}
 		acm->notify->driver_data = acm;