Commit e93e890e authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: usb-audio: Improve some debug prints

There are a few rooms for improvements wrt the debug prints:
- The EP debug print is shown only at starting, not at stopping
- The EP debug print contains useless object addresses
- Some helpers show the urb and the EP object addresses, too

This patch addresses those shortcomings.

Tested-by: default avatarKeith Milner <>
Tested-by: default avatarDylan Robinson <>

Signed-off-by: default avatarTakashi Iwai <>
parent 1803503f
......@@ -367,8 +367,8 @@ static void queue_pending_output_urbs(struct snd_usb_endpoint *ep)
err = usb_submit_urb(ctx->urb, GFP_ATOMIC);
if (err < 0)
"Unable to submit urb #%d: %d (urb %p)\n",
ctx->index, err, ctx->urb);
"Unable to submit urb #%d: %d at %s\n",
ctx->index, err, __func__);
set_bit(ctx->index, &ep->active_mask);
......@@ -494,8 +494,8 @@ struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip,
if (ep) {
usb_audio_dbg(ep->chip, "Re-using EP %x in iface %d,%d @%p\n",
ep_num, ep->iface, ep->altsetting, ep);
usb_audio_dbg(ep->chip, "Re-using EP %x in iface %d,%d\n",
ep_num, ep->iface, ep->altsetting);
goto __exit_unlock;
......@@ -218,7 +218,7 @@ static int start_endpoints(struct snd_usb_substream *subs)
if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
struct snd_usb_endpoint *ep = subs->data_endpoint;
dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
dev_dbg(&subs->dev->dev, "Starting data EP 0x%x\n", ep->ep_num);
ep->data_subs = subs;
err = snd_usb_endpoint_start(ep);
......@@ -232,7 +232,7 @@ static int start_endpoints(struct snd_usb_substream *subs)
!test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
struct snd_usb_endpoint *ep = subs->sync_endpoint;
dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
dev_dbg(&subs->dev->dev, "Starting sync EP 0x%x\n", ep->ep_num);
ep->sync_slave = subs->data_endpoint;
err = snd_usb_endpoint_start(ep);
......@@ -255,12 +255,17 @@ static void sync_pending_stops(struct snd_usb_substream *subs)
static void stop_endpoints(struct snd_usb_substream *subs)
if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
dev_dbg(&subs->dev->dev, "Stopping sync EP 0x%x\n",
subs->sync_endpoint->sync_slave = NULL;
if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
dev_dbg(&subs->dev->dev, "Stopping data EP 0x%x\n",
/* PCM sync_stop callback */
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