usb: gadget: f_uac2: don't queue new requests when shutting down

In some circumstances when g_audio is being unloaded there happens
an endless loop in udc driver. It has happend on a board with
s3c-hsotg. If there are requests in endpoint's queue, they are completed
in a loop. But completing them might cause appending new requests
to the queue. This patch causes agdev_iso_complete() to return immediately
if request's status is -ESHUTDOWN. If it does not return immediately,
then although the current request is removed from the queue, a new one
is appended to the queue, so the above mentioned loop cannot end.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/f_uac2.c b/drivers/usb/gadget/f_uac2.c
index c024d27..6261db4 100644 (file)
--- a/drivers/usb/gadget/f_uac2.c
+++ b/drivers/usb/gadget/f_uac2.c
@@ -196,7 +196,7 @@ agdev_iso_complete(struct usb_ep *ep, struct usb_request *req)
        struct snd_uac2_chip *uac2 = prm->uac2;
 
        /* i/f shutting down */
-       if (!prm->ep_enabled)
+       if (!prm->ep_enabled || req->status == -ESHUTDOWN)
                return;
 
        /*