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Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0130-bcm2835-access-controls-under-the-audio-mutex.patch')
-rw-r--r--target/linux/brcm2708/patches-4.4/0130-bcm2835-access-controls-under-the-audio-mutex.patch237
1 files changed, 0 insertions, 237 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0130-bcm2835-access-controls-under-the-audio-mutex.patch b/target/linux/brcm2708/patches-4.4/0130-bcm2835-access-controls-under-the-audio-mutex.patch
deleted file mode 100644
index ee41e8de7b..0000000000
--- a/target/linux/brcm2708/patches-4.4/0130-bcm2835-access-controls-under-the-audio-mutex.patch
+++ /dev/null
@@ -1,237 +0,0 @@
-From b88f8bdd254f5afd9284c7d75d10d4952c6dd9a4 Mon Sep 17 00:00:00 2001
-From: wm4 <wm4@nowhere>
-Date: Wed, 13 Jan 2016 19:43:35 +0100
-Subject: [PATCH] bcm2835: access controls under the audio mutex
-
-I don't think the ALSA framework provides any kind of automatic
-synchronization within the control callbacks. We most likely need
-to ensure this manually, so add locking around all access to shared
-mutable data. In particular, bcm2835_audio_set_ctls() should
-probably always be called under our own audio lock.
----
- sound/arm/bcm2835-ctl.c | 74 +++++++++++++++++++++++++++++++++++++++++--------
- sound/arm/bcm2835-pcm.c | 4 +++
- 2 files changed, 66 insertions(+), 12 deletions(-)
-
---- a/sound/arm/bcm2835-ctl.c
-+++ b/sound/arm/bcm2835-ctl.c
-@@ -94,6 +94,9 @@ 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;
-+
- BUG_ON(!chip && !(chip->avail_substreams & AVAIL_SUBSTREAMS_MASK));
-
- if (kcontrol->private_value == PCM_PLAYBACK_VOLUME)
-@@ -103,6 +106,7 @@ static int snd_bcm2835_ctl_get(struct sn
- else if (kcontrol->private_value == PCM_PLAYBACK_DEVICE)
- ucontrol->value.integer.value[0] = chip->dest;
-
-+ mutex_unlock(&chip->audio_mutex);
- return 0;
- }
-
-@@ -112,11 +116,15 @@ 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;
-+
- 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]);
- if (chip->mute == CTRL_VOL_MUTE) {
- /* changed = toggle_mute(chip, CTRL_VOL_UNMUTE); */
-- return 1; /* should return 0 to signify no change but the mixer takes this as the opposite sign (no idea why) */
-+ changed = 1; /* should return 0 to signify no change but the mixer takes this as the opposite sign (no idea why) */
-+ goto unlock;
- }
- if (changed
- || (ucontrol->value.integer.value[0] != chip2alsa(chip->volume))) {
-@@ -142,6 +150,8 @@ static int snd_bcm2835_ctl_put(struct sn
- printk(KERN_ERR "Failed to set ALSA controls..\n");
- }
-
-+unlock:
-+ mutex_unlock(&chip->audio_mutex);
- return changed;
- }
-
-@@ -198,10 +208,14 @@ 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;
-+
- for (i = 0; i < 4; i++)
- ucontrol->value.iec958.status[i] =
- (chip->spdif_status >> (i * 8)) && 0xff;
-
-+ mutex_unlock(&chip->audio_mutex);
- return 0;
- }
-
-@@ -212,12 +226,16 @@ static int snd_bcm2835_spdif_default_put
- unsigned int val = 0;
- int i, change;
-
-+ if (mutex_lock_interruptible(&chip->audio_mutex))
-+ return -EINTR;
-+
- for (i = 0; i < 4; i++)
- val |= (unsigned int)ucontrol->value.iec958.status[i] << (i * 8);
-
- change = val != chip->spdif_status;
- chip->spdif_status = val;
-
-+ mutex_unlock(&chip->audio_mutex);
- return change;
- }
-
-@@ -253,9 +271,14 @@ 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;
-+
- for (i = 0; i < 4; i++)
- ucontrol->value.iec958.status[i] =
- (chip->spdif_status >> (i * 8)) & 0xff;
-+
-+ mutex_unlock(&chip->audio_mutex);
- return 0;
- }
-
-@@ -266,11 +289,15 @@ static int snd_bcm2835_spdif_stream_put(
- unsigned int val = 0;
- int i, change;
-
-+ if (mutex_lock_interruptible(&chip->audio_mutex))
-+ return -EINTR;
-+
- for (i = 0; i < 4; i++)
- val |= (unsigned int)ucontrol->value.iec958.status[i] << (i * 8);
- change = val != chip->spdif_status;
- chip->spdif_status = val;
-
-+ mutex_unlock(&chip->audio_mutex);
- return change;
- }
-
-@@ -454,11 +481,17 @@ static int snd_bcm2835_chmap_ctl_get(str
- unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
- struct snd_pcm_substream *substream = snd_pcm_chmap_substream(info, idx);
- struct cea_channel_speaker_allocation *ch = NULL;
-+ int res = 0;
- int cur = 0;
- int i;
-
-- if (!substream || !substream->runtime)
-- return -ENODEV;
-+ if (mutex_lock_interruptible(&chip->audio_mutex))
-+ return -EINTR;
-+
-+ if (!substream || !substream->runtime) {
-+ res = -ENODEV;
-+ goto unlock;
-+ }
-
- for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
- if (channel_allocations[i].ca_index == chip->cea_chmap)
-@@ -476,7 +509,10 @@ static int snd_bcm2835_chmap_ctl_get(str
- }
- while (cur < 8)
- ucontrol->value.integer.value[cur++] = SNDRV_CHMAP_NA;
-- return 0;
-+
-+unlock:
-+ mutex_unlock(&chip->audio_mutex);
-+ return res;
- }
-
- static int snd_bcm2835_chmap_ctl_put(struct snd_kcontrol *kcontrol,
-@@ -487,10 +523,16 @@ static int snd_bcm2835_chmap_ctl_put(str
- unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
- struct snd_pcm_substream *substream = snd_pcm_chmap_substream(info, idx);
- int i, prepared = 0, cea_chmap = -1;
-+ int res = 0;
- int remap[8];
-
-- if (!substream || !substream->runtime)
-- return -ENODEV;
-+ if (mutex_lock_interruptible(&chip->audio_mutex))
-+ return -EINTR;
-+
-+ if (!substream || !substream->runtime) {
-+ res = -ENODEV;
-+ goto unlock;
-+ }
-
- switch (substream->runtime->status->state) {
- case SNDRV_PCM_STATE_OPEN:
-@@ -500,7 +542,8 @@ static int snd_bcm2835_chmap_ctl_put(str
- prepared = 1;
- break;
- default:
-- return -EBUSY;
-+ res = -EBUSY;
-+ goto unlock;
- }
-
- for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
-@@ -538,19 +581,26 @@ static int snd_bcm2835_chmap_ctl_put(str
- }
- }
-
-- if (cea_chmap < 0)
-- return -EINVAL;
-+ if (cea_chmap < 0) {
-+ res = -EINVAL;
-+ goto unlock;
-+ }
-
- /* don't change the layout if another substream is active */
-- if (chip->opened != (1 << substream->number) && chip->cea_chmap != cea_chmap)
-- return -EBUSY; /* unsure whether this is a good error code */
-+ if (chip->opened != (1 << substream->number) && chip->cea_chmap != cea_chmap) {
-+ res = -EBUSY; /* unsure whether this is a good error code */
-+ goto unlock;
-+ }
-
- chip->cea_chmap = cea_chmap;
- for (i = 0; i < 8; i++)
- chip->map_channels[i] = remap[i];
- if (prepared)
- snd_bcm2835_pcm_prepare_again(substream);
-- return 0;
-+
-+unlock:
-+ mutex_unlock(&chip->audio_mutex);
-+ return res;
- }
-
- static int snd_bcm2835_add_chmap_ctl(bcm2835_chip_t * chip)
---- a/sound/arm/bcm2835-pcm.c
-+++ b/sound/arm/bcm2835-pcm.c
-@@ -379,6 +379,9 @@ static int snd_bcm2835_pcm_prepare(struc
-
- audio_info(" .. IN\n");
-
-+ if (mutex_lock_interruptible(&chip->audio_mutex))
-+ return -EINTR;
-+
- snd_bcm2835_pcm_prepare_again(substream);
-
- bcm2835_audio_setup(alsa_stream);
-@@ -401,6 +404,7 @@ static int snd_bcm2835_pcm_prepare(struc
- alsa_stream->buffer_size, alsa_stream->period_size,
- alsa_stream->pos, runtime->frame_bits);
-
-+ mutex_unlock(&chip->audio_mutex);
- audio_info(" .. OUT\n");
- return 0;
- }
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-21 18:32:41 +0000