linux-kernel - [ 18/38] ALSA: PCM: Fix some races at disconnection

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Message-Id: <20121115040934.035319375@linuxfoundation.org>
Date:	Wed, 14 Nov 2012 20:10:15 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Matthieu CASTET <matthieu.castet@...rot.com>,
	Takashi Iwai <tiwai@...e.de>
Subject: [ 18/38] ALSA: PCM: Fix some races at disconnection

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Iwai <tiwai@...e.de>

commit 9b0573c07f278e9888c352aa9724035c75784ea0 upstream.

Fix races at PCM disconnection:
- while a PCM device is being opened or closed
- while the PCM state is being changed without lock in prepare,
  hw_params, hw_free ops

Reported-by: Matthieu CASTET <matthieu.castet@...rot.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/core/pcm.c        |    7 ++++++-
 sound/core/pcm_native.c |   16 ++++++++++++----
 2 files changed, 18 insertions(+), 5 deletions(-)

--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -1045,11 +1045,15 @@ static int snd_pcm_dev_disconnect(struct
 	if (list_empty(&pcm->list))
 		goto unlock;
 
+	mutex_lock(&pcm->open_mutex);
 	list_del_init(&pcm->list);
 	for (cidx = 0; cidx < 2; cidx++)
-		for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
+		for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
+			snd_pcm_stream_lock_irq(substream);
 			if (substream->runtime)
 				substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
+			snd_pcm_stream_unlock_irq(substream);
+		}
 	list_for_each_entry(notify, &snd_pcm_notify_list, list) {
 		notify->n_disconnect(pcm);
 	}
@@ -1065,6 +1069,7 @@ static int snd_pcm_dev_disconnect(struct
 		}
 		snd_unregister_device(devtype, pcm->card, pcm->device);
 	}
+	mutex_unlock(&pcm->open_mutex);
  unlock:
 	mutex_unlock(&register_mutex);
 	return 0;
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -368,6 +368,14 @@ static int period_to_usecs(struct snd_pc
 	return usecs;
 }
 
+static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
+{
+	snd_pcm_stream_lock_irq(substream);
+	if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
+		substream->runtime->status->state = state;
+	snd_pcm_stream_unlock_irq(substream);
+}
+
 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 			     struct snd_pcm_hw_params *params)
 {
@@ -451,7 +459,7 @@ static int snd_pcm_hw_params(struct snd_
 		runtime->boundary *= 2;
 
 	snd_pcm_timer_resolution_change(substream);
-	runtime->status->state = SNDRV_PCM_STATE_SETUP;
+	snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 
 	if (pm_qos_request_active(&substream->latency_pm_qos_req))
 		pm_qos_remove_request(&substream->latency_pm_qos_req);
@@ -463,7 +471,7 @@ static int snd_pcm_hw_params(struct snd_
 	/* hardware might be unusable from this time,
 	   so we force application to retry to set
 	   the correct hardware parameter settings */
-	runtime->status->state = SNDRV_PCM_STATE_OPEN;
+	snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 	if (substream->ops->hw_free != NULL)
 		substream->ops->hw_free(substream);
 	return err;
@@ -511,7 +519,7 @@ static int snd_pcm_hw_free(struct snd_pc
 		return -EBADFD;
 	if (substream->ops->hw_free)
 		result = substream->ops->hw_free(substream);
-	runtime->status->state = SNDRV_PCM_STATE_OPEN;
+	snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 	pm_qos_remove_request(&substream->latency_pm_qos_req);
 	return result;
 }
@@ -1319,7 +1327,7 @@ static void snd_pcm_post_prepare(struct
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	runtime->control->appl_ptr = runtime->status->hw_ptr;
-	runtime->status->state = SNDRV_PCM_STATE_PREPARED;
+	snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
 }
 
 static struct action_ops snd_pcm_action_prepare = {


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