On Wed, 7 Nov 2012, Takashi Iwai wrote:
> > What is the right solution for this problem?
>
> How about the patch below? (It's for 3.6, and won't be applied cleanly
> to 3.7, but easy to adapt.)
I simplified your patch a little. This is for 3.7, not 3.6. I
verified that it does fix the problem raised by the test program.
If you think this is okay, I'll submit it officially.
Alan Stern
Index: usb-3.7/sound/usb/endpoint.h
===================================================================
--- usb-3.7.orig/sound/usb/endpoint.h
+++ usb-3.7/sound/usb/endpoint.h
@@ -19,6 +19,7 @@ int snd_usb_endpoint_set_params(struct s
int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, int can_sleep);
void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep,
int force, int can_sleep, int wait);
+void snd_usb_endpoint_sync_stop(struct snd_usb_endpoint *ep);
int snd_usb_endpoint_activate(struct snd_usb_endpoint *ep);
int snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep);
void snd_usb_endpoint_free(struct list_head *head);
Index: usb-3.7/sound/usb/pcm.c
===================================================================
--- usb-3.7.orig/sound/usb/pcm.c
+++ usb-3.7/sound/usb/pcm.c
@@ -576,6 +576,11 @@ static int snd_usb_pcm_prepare(struct sn
subs->need_setup_ep = false;
}
+ if (subs->sync_endpoint)
+ snd_usb_endpoint_sync_stop(subs->sync_endpoint);
+ if (subs->data_endpoint)
+ snd_usb_endpoint_sync_stop(subs->data_endpoint);
+
/* some unit conversions in runtime */
subs->data_endpoint->maxframesize =
bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
Index: usb-3.7/sound/usb/endpoint.c
===================================================================
--- usb-3.7.orig/sound/usb/endpoint.c
+++ usb-3.7/sound/usb/endpoint.c
@@ -481,7 +481,7 @@ __exit_unlock:
/*
* wait until all urbs are processed.
*/
-static int wait_clear_urbs(struct snd_usb_endpoint *ep)
+void snd_usb_endpoint_sync_stop(struct snd_usb_endpoint *ep)
{
unsigned long end_time = jiffies + msecs_to_jiffies(1000);
unsigned int i;
@@ -502,8 +502,6 @@ static int wait_clear_urbs(struct snd_us
if (alive)
snd_printk(KERN_ERR "timeout: still %d active urbs on EP #%x\n",
alive, ep->ep_num);
-
- return 0;
}
/*
@@ -556,7 +554,7 @@ static void release_urbs(struct snd_usb_
/* stop urbs */
deactivate_urbs(ep, force, 1);
- wait_clear_urbs(ep);
+ snd_usb_endpoint_sync_stop(ep);
for (i = 0; i < ep->nurbs; i++)
release_urb_ctx(&ep->urb[i]);
@@ -833,7 +831,7 @@ int snd_usb_endpoint_start(struct snd_us
/* just to be sure */
deactivate_urbs(ep, 0, can_sleep);
if (can_sleep)
- wait_clear_urbs(ep);
+ snd_usb_endpoint_sync_stop(ep);
ep->active_mask = 0;
ep->unlink_mask = 0;
@@ -917,7 +915,7 @@ void snd_usb_endpoint_stop(struct snd_us
ep->prepare_data_urb = NULL;
if (wait)
- wait_clear_urbs(ep);
+ snd_usb_endpoint_sync_stop(ep);
}
}
@@ -940,7 +938,7 @@ int snd_usb_endpoint_deactivate(struct s
return -EINVAL;
deactivate_urbs(ep, 1, 1);
- wait_clear_urbs(ep);
+ snd_usb_endpoint_sync_stop(ep);
if (ep->use_count != 0)
return 0;
--
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