+++ /dev/null
-From 96588b9ccaddd69a832a07e2e3f2f3299e6d6c3a Mon Sep 17 00:00:00 2001
-From: Takashi Iwai <tiwai@suse.de>
-Date: Tue, 4 Sep 2018 17:58:30 +0200
-Subject: [PATCH] staging: bcm2835-audio: Clean up mutex locks
-
-commit ce4bb1aa271a97047b80ac917a5d91b54925913b upstream.
-
-snd-bcm2835 driver takes the lock with mutex_lock_interruptible() in
-all places, which don't make sense. Replace them with the simple
-mutex_lock().
-
-Also taking a mutex lock right after creating it for each PCM object
-is nonsense, too. It cannot be racy at that point. We can get rid of
-it.
-
-Last but not least, initializing chip->audio_mutex at each place is
-error-prone. Initialize properly at creating the chip object in
-snd_bcm2835_create() instead.
-
-Signed-off-by: Takashi Iwai <tiwai@suse.de>
-Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
----
- .../vc04_services/bcm2835-audio/bcm2835-ctl.c | 18 +++----
- .../vc04_services/bcm2835-audio/bcm2835-pcm.c | 33 ++-----------
- .../bcm2835-audio/bcm2835-vchiq.c | 47 ++++---------------
- .../vc04_services/bcm2835-audio/bcm2835.c | 1 +
- 4 files changed, 20 insertions(+), 79 deletions(-)
-
---- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c
-+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c
-@@ -77,8 +77,7 @@ static int snd_bcm2835_ctl_get(struct sn
- {
- struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
-
-- if (mutex_lock_interruptible(&chip->audio_mutex))
-- return -EINTR;
-+ mutex_lock(&chip->audio_mutex);
-
- BUG_ON(!chip && !(chip->avail_substreams & AVAIL_SUBSTREAMS_MASK));
-
-@@ -99,8 +98,7 @@ static int snd_bcm2835_ctl_put(struct sn
- struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
- int changed = 0;
-
-- if (mutex_lock_interruptible(&chip->audio_mutex))
-- return -EINTR;
-+ mutex_lock(&chip->audio_mutex);
-
- if (kcontrol->private_value == PCM_PLAYBACK_VOLUME) {
- audio_info("Volume change attempted.. volume = %d new_volume = %d\n", chip->volume, (int)ucontrol->value.integer.value[0]);
-@@ -187,8 +185,7 @@ static int snd_bcm2835_spdif_default_get
- struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
- int i;
-
-- if (mutex_lock_interruptible(&chip->audio_mutex))
-- return -EINTR;
-+ mutex_lock(&chip->audio_mutex);
-
- for (i = 0; i < 4; i++)
- ucontrol->value.iec958.status[i] =
-@@ -205,8 +202,7 @@ static int snd_bcm2835_spdif_default_put
- unsigned int val = 0;
- int i, change;
-
-- if (mutex_lock_interruptible(&chip->audio_mutex))
-- return -EINTR;
-+ mutex_lock(&chip->audio_mutex);
-
- for (i = 0; i < 4; i++)
- val |= (unsigned int)ucontrol->value.iec958.status[i] << (i * 8);
-@@ -251,8 +247,7 @@ static int snd_bcm2835_spdif_stream_get(
- struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
- int i;
-
-- if (mutex_lock_interruptible(&chip->audio_mutex))
-- return -EINTR;
-+ mutex_lock(&chip->audio_mutex);
-
- for (i = 0; i < 4; i++)
- ucontrol->value.iec958.status[i] =
-@@ -269,8 +264,7 @@ static int snd_bcm2835_spdif_stream_put(
- unsigned int val = 0;
- int i, change;
-
-- if (mutex_lock_interruptible(&chip->audio_mutex))
-- return -EINTR;
-+ mutex_lock(&chip->audio_mutex);
-
- for (i = 0; i < 4; i++)
- val |= (unsigned int)ucontrol->value.iec958.status[i] << (i * 8);
---- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
-+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
-@@ -99,10 +99,7 @@ static int snd_bcm2835_playback_open_gen
- int idx;
- int err;
-
-- if (mutex_lock_interruptible(&chip->audio_mutex)) {
-- audio_error("Interrupted whilst waiting for lock\n");
-- return -EINTR;
-- }
-+ mutex_lock(&chip->audio_mutex);
- audio_info("Alsa open (%d)\n", substream->number);
- idx = substream->number;
-
-@@ -194,10 +191,7 @@ static int snd_bcm2835_playback_close(st
- struct bcm2835_alsa_stream *alsa_stream;
-
- chip = snd_pcm_substream_chip(substream);
-- if (mutex_lock_interruptible(&chip->audio_mutex)) {
-- audio_error("Interrupted whilst waiting for lock\n");
-- return -EINTR;
-- }
-+ mutex_lock(&chip->audio_mutex);
- runtime = substream->runtime;
- alsa_stream = runtime->private_data;
-
-@@ -274,8 +268,7 @@ static int snd_bcm2835_pcm_prepare(struc
- int channels;
- int err;
-
-- if (mutex_lock_interruptible(&chip->audio_mutex))
-- return -EINTR;
-+ mutex_lock(&chip->audio_mutex);
-
- /* notify the vchiq that it should enter spdif passthrough mode by
- * setting channels=0 (see
-@@ -449,14 +442,9 @@ int snd_bcm2835_new_pcm(struct bcm2835_c
- struct snd_pcm *pcm;
- int err;
-
-- mutex_init(&chip->audio_mutex);
-- if (mutex_lock_interruptible(&chip->audio_mutex)) {
-- audio_error("Interrupted whilst waiting for lock\n");
-- return -EINTR;
-- }
- err = snd_pcm_new(chip->card, "bcm2835 ALSA", 0, numchannels, 0, &pcm);
- if (err < 0)
-- goto out;
-+ return err;
- pcm->private_data = chip;
- strcpy(pcm->name, "bcm2835 ALSA");
- chip->pcm = pcm;
-@@ -474,9 +462,6 @@ int snd_bcm2835_new_pcm(struct bcm2835_c
- snd_bcm2835_playback_hw.buffer_bytes_max,
- snd_bcm2835_playback_hw.buffer_bytes_max);
-
--out:
-- mutex_unlock(&chip->audio_mutex);
--
- return 0;
- }
-
-@@ -485,13 +470,9 @@ int snd_bcm2835_new_spdif_pcm(struct bcm
- struct snd_pcm *pcm;
- int err;
-
-- if (mutex_lock_interruptible(&chip->audio_mutex)) {
-- audio_error("Interrupted whilst waiting for lock\n");
-- return -EINTR;
-- }
- err = snd_pcm_new(chip->card, "bcm2835 ALSA", 1, 1, 0, &pcm);
- if (err < 0)
-- goto out;
-+ return err;
-
- pcm->private_data = chip;
- strcpy(pcm->name, "bcm2835 IEC958/HDMI");
-@@ -504,8 +485,6 @@ int snd_bcm2835_new_spdif_pcm(struct bcm
- snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
- snd_dma_continuous_data(GFP_KERNEL),
- snd_bcm2835_playback_spdif_hw.buffer_bytes_max, snd_bcm2835_playback_spdif_hw.buffer_bytes_max);
--out:
-- mutex_unlock(&chip->audio_mutex);
-
- return 0;
- }
-@@ -518,8 +497,6 @@ int snd_bcm2835_new_simple_pcm(struct bc
- struct snd_pcm *pcm;
- int err;
-
-- mutex_init(&chip->audio_mutex);
--
- err = snd_pcm_new(chip->card, name, 0, numchannels,
- 0, &pcm);
- if (err)
---- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c
-+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c
-@@ -319,11 +319,7 @@ static int vc_vchi_audio_deinit(struct b
- }
-
- LOG_DBG(" .. about to lock (%d)\n", instance->num_connections);
-- if (mutex_lock_interruptible(&instance->vchi_mutex)) {
-- LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
-- instance->num_connections);
-- return -EINTR;
-- }
-+ mutex_lock(&instance->vchi_mutex);
-
- /* Close all VCHI service connections */
- for (i = 0; i < instance->num_connections; i++) {
-@@ -434,11 +430,7 @@ int bcm2835_audio_open(struct bcm2835_al
- instance = alsa_stream->instance;
- LOG_DBG(" instance (%p)\n", instance);
-
-- if (mutex_lock_interruptible(&instance->vchi_mutex)) {
-- LOG_DBG("Interrupted whilst waiting for lock on (%d)\n", instance->num_connections);
-- ret = -EINTR;
-- goto free_wq;
-- }
-+ mutex_lock(&instance->vchi_mutex);
- vchi_service_use(instance->vchi_handle[0]);
-
- m.type = VC_AUDIO_MSG_TYPE_OPEN;
-@@ -479,11 +471,7 @@ static int bcm2835_audio_set_ctls_chan(s
- LOG_INFO(" Setting ALSA dest(%d), volume(%d)\n",
- chip->dest, chip->volume);
-
-- if (mutex_lock_interruptible(&instance->vchi_mutex)) {
-- LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
-- instance->num_connections);
-- return -EINTR;
-- }
-+ mutex_lock(&instance->vchi_mutex);
- vchi_service_use(instance->vchi_handle[0]);
-
- instance->result = -1;
-@@ -569,10 +557,7 @@ int bcm2835_audio_set_params(struct bcm2
- return -EINVAL;
- }
-
-- if (mutex_lock_interruptible(&instance->vchi_mutex)) {
-- LOG_DBG("Interrupted whilst waiting for lock on (%d)\n", instance->num_connections);
-- return -EINTR;
-- }
-+ mutex_lock(&instance->vchi_mutex);
- vchi_service_use(instance->vchi_handle[0]);
-
- instance->result = -1;
-@@ -629,11 +614,7 @@ static int bcm2835_audio_start_worker(st
- int status;
- int ret;
-
-- if (mutex_lock_interruptible(&instance->vchi_mutex)) {
-- LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
-- instance->num_connections);
-- return -EINTR;
-- }
-+ mutex_lock(&instance->vchi_mutex);
- vchi_service_use(instance->vchi_handle[0]);
-
- m.type = VC_AUDIO_MSG_TYPE_START;
-@@ -665,11 +646,7 @@ static int bcm2835_audio_stop_worker(str
- int status;
- int ret;
-
-- if (mutex_lock_interruptible(&instance->vchi_mutex)) {
-- LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
-- instance->num_connections);
-- return -EINTR;
-- }
-+ mutex_lock(&instance->vchi_mutex);
- vchi_service_use(instance->vchi_handle[0]);
-
- m.type = VC_AUDIO_MSG_TYPE_STOP;
-@@ -704,11 +681,7 @@ int bcm2835_audio_close(struct bcm2835_a
-
- my_workqueue_quit(alsa_stream);
-
-- if (mutex_lock_interruptible(&instance->vchi_mutex)) {
-- LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
-- instance->num_connections);
-- return -EINTR;
-- }
-+ mutex_lock(&instance->vchi_mutex);
- vchi_service_use(instance->vchi_handle[0]);
-
- m.type = VC_AUDIO_MSG_TYPE_CLOSE;
-@@ -761,11 +734,7 @@ static int bcm2835_audio_write_worker(st
-
- LOG_INFO(" Writing %d bytes from %p\n", count, src);
-
-- if (mutex_lock_interruptible(&instance->vchi_mutex)) {
-- LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
-- instance->num_connections);
-- return -EINTR;
-- }
-+ mutex_lock(&instance->vchi_mutex);
- vchi_service_use(instance->vchi_handle[0]);
-
- if (instance->peer_version == 0 &&
---- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
-+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
-@@ -149,6 +149,7 @@ static int snd_bcm2835_create(struct snd
- return -ENOMEM;
-
- chip->card = card;
-+ mutex_init(&chip->audio_mutex);
-
- chip->vchi_ctx = devres_find(card->dev->parent,
- bcm2835_devm_free_vchi_ctx, NULL, NULL);
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