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-rw-r--r--sound/usb/endpoint.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 7f78c6d..34de6f2 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -35,6 +35,7 @@
#define EP_FLAG_ACTIVATED 0
#define EP_FLAG_RUNNING 1
+#define EP_FLAG_STOPPING 2
/*
* snd_usb_endpoint is a model that abstracts everything related to an
@@ -502,10 +503,20 @@ static int wait_clear_urbs(struct snd_usb_endpoint *ep)
if (alive)
snd_printk(KERN_ERR "timeout: still %d active urbs on EP #%x\n",
alive, ep->ep_num);
+ clear_bit(EP_FLAG_STOPPING, &ep->flags);
return 0;
}
+/* sync the pending stop operation;
+ * this function itself doesn't trigger the stop operation
+ */
+void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep)
+{
+ if (ep && test_bit(EP_FLAG_STOPPING, &ep->flags))
+ wait_clear_urbs(ep);
+}
+
/*
* unlink active urbs.
*/
@@ -918,6 +929,8 @@ void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep,
if (wait)
wait_clear_urbs(ep);
+ else
+ set_bit(EP_FLAG_STOPPING, &ep->flags);
}
}
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