From 1ade5d7e179170e3cf4780ba578ebb8cc7aa15ef Mon Sep 17 00:00:00 2001
From: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Date: Thu, 15 May 2014 13:43:50 +0200
Subject: [PATCH] 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>
---
 drivers/usb/gadget/f_uac2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/f_uac2.c b/drivers/usb/gadget/f_uac2.c
index c024d27fcce21..6261db4a99105 100644
--- 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;
 
 	/*
-- 
2.39.5