X-Git-Url: http://git.openwrt.org/?a=blobdiff_plain;f=target%2Flinux%2Fbrcm2708%2Fpatches-4.19%2F950-0391-staging-bcm2835-audio-Clean-up-mutex-locks.patch;fp=target%2Flinux%2Fbrcm2708%2Fpatches-4.19%2F950-0391-staging-bcm2835-audio-Clean-up-mutex-locks.patch;h=531fe9e818b4836bf59eb937a5cb79b88e45af8b;hb=67dcc43f3a22dc3a7ac07a7065971b426feeb043;hp=0000000000000000000000000000000000000000;hpb=47a93a810f78adce5a130d287f82b28e9b54313c;p=openwrt%2Fstaging%2Fchunkeey.git diff --git a/target/linux/brcm2708/patches-4.19/950-0391-staging-bcm2835-audio-Clean-up-mutex-locks.patch b/target/linux/brcm2708/patches-4.19/950-0391-staging-bcm2835-audio-Clean-up-mutex-locks.patch new file mode 100644 index 0000000000..531fe9e818 --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0391-staging-bcm2835-audio-Clean-up-mutex-locks.patch @@ -0,0 +1,301 @@ +From 96588b9ccaddd69a832a07e2e3f2f3299e6d6c3a Mon Sep 17 00:00:00 2001 +From: Takashi Iwai +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 +Tested-by: Stefan Wahren +Signed-off-by: Greg Kroah-Hartman +--- + .../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);