[Quantal][PATCH 1/2](pre-mainline) ALSA: snd-usb: tighten EP_FLAG_RUNNING checks

[joseph.salisbury at canonical.com]

From: Joseph Salisbury <joseph.salisbury at canonical.com>

BugLink: http://bugs.launchpad.net/bugs/1018020

In endpoint.c, bail out earlier in case the stream is stopped. Also
clear the flag from deactivate_urbs() in case the chip's shutdown
flag is set.

Signed-off-by: Daniel Mack <zonque at gmail.com>
Signed-off-by: Joseph Salisbury <joseph.salisbury at canonical.com>
---
 sound/usb/endpoint.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index e690690..a75bdf4 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -350,7 +350,8 @@ static void snd_complete_urb(struct urb *urb)
 		     urb->status == -ENODEV ||		/* device removed */
 		     urb->status == -ECONNRESET ||	/* unlinked */
 		     urb->status == -ESHUTDOWN ||	/* device disabled */
-		     ep->chip->shutdown))		/* device disconnected */
+		     ep->chip->shutdown) ||		/* device disconnected */
+		     !test_bit(EP_FLAG_RUNNING, &ep->flags))
 		goto exit_clear;
 
 	if (usb_pipeout(ep->pipe)) {
@@ -522,13 +523,13 @@ static int deactivate_urbs(struct snd_usb_endpoint *ep, int force, int can_sleep
 	unsigned int i;
 	int async;
 
+	clear_bit(EP_FLAG_RUNNING, &ep->flags);
+
 	if (!force && ep->chip->shutdown) /* to be sure... */
 		return -EBADFD;
 
 	async = !can_sleep && ep->chip->async_unlink;
 
-	clear_bit(EP_FLAG_RUNNING, &ep->flags);
-
 	INIT_LIST_HEAD(&ep->ready_playback_urbs);
 	ep->next_packet_read_pos = 0;
 	ep->next_packet_write_pos = 0;
-- 
1.7.9.5