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238 lines
6.8 KiB
Diff
238 lines
6.8 KiB
Diff
From fb9b7c60bed82b9a4c6ed329b349e6e5b8a60db9 Mon Sep 17 00:00:00 2001
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From: wm4 <wm4@nowhere>
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Date: Wed, 13 Jan 2016 19:43:35 +0100
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Subject: [PATCH 130/304] bcm2835: access controls under the audio mutex
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I don't think the ALSA framework provides any kind of automatic
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synchronization within the control callbacks. We most likely need
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to ensure this manually, so add locking around all access to shared
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mutable data. In particular, bcm2835_audio_set_ctls() should
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probably always be called under our own audio lock.
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---
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sound/arm/bcm2835-ctl.c | 74 +++++++++++++++++++++++++++++++++++++++++--------
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sound/arm/bcm2835-pcm.c | 4 +++
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2 files changed, 66 insertions(+), 12 deletions(-)
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--- a/sound/arm/bcm2835-ctl.c
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+++ b/sound/arm/bcm2835-ctl.c
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@@ -94,6 +94,9 @@ static int snd_bcm2835_ctl_get(struct sn
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{
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struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
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+ if (mutex_lock_interruptible(&chip->audio_mutex))
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+ return -EINTR;
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+
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BUG_ON(!chip && !(chip->avail_substreams & AVAIL_SUBSTREAMS_MASK));
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if (kcontrol->private_value == PCM_PLAYBACK_VOLUME)
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@@ -103,6 +106,7 @@ static int snd_bcm2835_ctl_get(struct sn
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else if (kcontrol->private_value == PCM_PLAYBACK_DEVICE)
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ucontrol->value.integer.value[0] = chip->dest;
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+ mutex_unlock(&chip->audio_mutex);
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return 0;
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}
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@@ -112,11 +116,15 @@ static int snd_bcm2835_ctl_put(struct sn
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struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
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int changed = 0;
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+ if (mutex_lock_interruptible(&chip->audio_mutex))
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+ return -EINTR;
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+
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if (kcontrol->private_value == PCM_PLAYBACK_VOLUME) {
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audio_info("Volume change attempted.. volume = %d new_volume = %d\n", chip->volume, (int)ucontrol->value.integer.value[0]);
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if (chip->mute == CTRL_VOL_MUTE) {
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/* changed = toggle_mute(chip, CTRL_VOL_UNMUTE); */
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- return 1; /* should return 0 to signify no change but the mixer takes this as the opposite sign (no idea why) */
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+ changed = 1; /* should return 0 to signify no change but the mixer takes this as the opposite sign (no idea why) */
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+ goto unlock;
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}
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if (changed
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|| (ucontrol->value.integer.value[0] != chip2alsa(chip->volume))) {
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@@ -142,6 +150,8 @@ static int snd_bcm2835_ctl_put(struct sn
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printk(KERN_ERR "Failed to set ALSA controls..\n");
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}
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+unlock:
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+ mutex_unlock(&chip->audio_mutex);
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return changed;
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}
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@@ -198,10 +208,14 @@ static int snd_bcm2835_spdif_default_get
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struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
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int i;
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+ if (mutex_lock_interruptible(&chip->audio_mutex))
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+ return -EINTR;
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+
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for (i = 0; i < 4; i++)
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ucontrol->value.iec958.status[i] =
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(chip->spdif_status >> (i * 8)) && 0xff;
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+ mutex_unlock(&chip->audio_mutex);
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return 0;
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}
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@@ -212,12 +226,16 @@ static int snd_bcm2835_spdif_default_put
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unsigned int val = 0;
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int i, change;
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+ if (mutex_lock_interruptible(&chip->audio_mutex))
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+ return -EINTR;
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+
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for (i = 0; i < 4; i++)
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val |= (unsigned int)ucontrol->value.iec958.status[i] << (i * 8);
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change = val != chip->spdif_status;
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chip->spdif_status = val;
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+ mutex_unlock(&chip->audio_mutex);
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return change;
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}
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@@ -253,9 +271,14 @@ static int snd_bcm2835_spdif_stream_get(
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struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
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int i;
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+ if (mutex_lock_interruptible(&chip->audio_mutex))
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+ return -EINTR;
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+
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for (i = 0; i < 4; i++)
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ucontrol->value.iec958.status[i] =
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(chip->spdif_status >> (i * 8)) & 0xff;
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+
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+ mutex_unlock(&chip->audio_mutex);
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return 0;
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}
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@@ -266,11 +289,15 @@ static int snd_bcm2835_spdif_stream_put(
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unsigned int val = 0;
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int i, change;
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+ if (mutex_lock_interruptible(&chip->audio_mutex))
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+ return -EINTR;
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+
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for (i = 0; i < 4; i++)
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val |= (unsigned int)ucontrol->value.iec958.status[i] << (i * 8);
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change = val != chip->spdif_status;
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chip->spdif_status = val;
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+ mutex_unlock(&chip->audio_mutex);
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return change;
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}
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@@ -454,11 +481,17 @@ static int snd_bcm2835_chmap_ctl_get(str
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unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
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struct snd_pcm_substream *substream = snd_pcm_chmap_substream(info, idx);
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struct cea_channel_speaker_allocation *ch = NULL;
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+ int res = 0;
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int cur = 0;
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int i;
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- if (!substream || !substream->runtime)
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- return -ENODEV;
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+ if (mutex_lock_interruptible(&chip->audio_mutex))
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+ return -EINTR;
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+
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+ if (!substream || !substream->runtime) {
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+ res = -ENODEV;
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+ goto unlock;
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+ }
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for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
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if (channel_allocations[i].ca_index == chip->cea_chmap)
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@@ -476,7 +509,10 @@ static int snd_bcm2835_chmap_ctl_get(str
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}
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while (cur < 8)
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ucontrol->value.integer.value[cur++] = SNDRV_CHMAP_NA;
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- return 0;
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+
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+unlock:
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+ mutex_unlock(&chip->audio_mutex);
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+ return res;
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}
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static int snd_bcm2835_chmap_ctl_put(struct snd_kcontrol *kcontrol,
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@@ -487,10 +523,16 @@ static int snd_bcm2835_chmap_ctl_put(str
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unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
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struct snd_pcm_substream *substream = snd_pcm_chmap_substream(info, idx);
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int i, prepared = 0, cea_chmap = -1;
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+ int res = 0;
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int remap[8];
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- if (!substream || !substream->runtime)
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- return -ENODEV;
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+ if (mutex_lock_interruptible(&chip->audio_mutex))
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+ return -EINTR;
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+
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+ if (!substream || !substream->runtime) {
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+ res = -ENODEV;
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+ goto unlock;
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+ }
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switch (substream->runtime->status->state) {
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case SNDRV_PCM_STATE_OPEN:
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@@ -500,7 +542,8 @@ static int snd_bcm2835_chmap_ctl_put(str
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prepared = 1;
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break;
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default:
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- return -EBUSY;
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+ res = -EBUSY;
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+ goto unlock;
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}
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for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
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@@ -538,19 +581,26 @@ static int snd_bcm2835_chmap_ctl_put(str
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}
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}
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- if (cea_chmap < 0)
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- return -EINVAL;
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+ if (cea_chmap < 0) {
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+ res = -EINVAL;
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+ goto unlock;
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+ }
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/* don't change the layout if another substream is active */
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- if (chip->opened != (1 << substream->number) && chip->cea_chmap != cea_chmap)
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- return -EBUSY; /* unsure whether this is a good error code */
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+ if (chip->opened != (1 << substream->number) && chip->cea_chmap != cea_chmap) {
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+ res = -EBUSY; /* unsure whether this is a good error code */
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+ goto unlock;
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+ }
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chip->cea_chmap = cea_chmap;
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for (i = 0; i < 8; i++)
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chip->map_channels[i] = remap[i];
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if (prepared)
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snd_bcm2835_pcm_prepare_again(substream);
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- return 0;
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+
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+unlock:
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+ mutex_unlock(&chip->audio_mutex);
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+ return res;
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}
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static int snd_bcm2835_add_chmap_ctl(bcm2835_chip_t * chip)
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--- a/sound/arm/bcm2835-pcm.c
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+++ b/sound/arm/bcm2835-pcm.c
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@@ -379,6 +379,9 @@ static int snd_bcm2835_pcm_prepare(struc
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audio_info(" .. IN\n");
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+ if (mutex_lock_interruptible(&chip->audio_mutex))
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+ return -EINTR;
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+
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snd_bcm2835_pcm_prepare_again(substream);
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bcm2835_audio_setup(alsa_stream);
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@@ -401,6 +404,7 @@ static int snd_bcm2835_pcm_prepare(struc
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alsa_stream->buffer_size, alsa_stream->period_size,
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alsa_stream->pos, runtime->frame_bits);
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+ mutex_unlock(&chip->audio_mutex);
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audio_info(" .. OUT\n");
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return 0;
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}
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