[alsa-devel] [PATCH 1/2] ALSA: fireworks: move mutex from function callees to callers
Takashi Sakamoto
o-takashi at sakamocchi.jp
Sat Oct 24 04:28:31 CEST 2015
Currently, critical section is protected by mutex in functions of
fireworks_stream.c. Callers increments/decrements substreams counter
before calling the functions. Moving mutex to the callers side allows
to change type of the substeram counter from atomic_t to unsigned int.
This commit is a preparation for obsoleting the usage of atomic_t for
substream counter.
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
sound/firewire/fireworks/fireworks_midi.c | 8 ++++++++
sound/firewire/fireworks/fireworks_pcm.c | 20 ++++++++++++++++----
sound/firewire/fireworks/fireworks_stream.c | 7 -------
3 files changed, 24 insertions(+), 11 deletions(-)
diff --git a/sound/firewire/fireworks/fireworks_midi.c b/sound/firewire/fireworks/fireworks_midi.c
index fba01bb..38232dc 100644
--- a/sound/firewire/fireworks/fireworks_midi.c
+++ b/sound/firewire/fireworks/fireworks_midi.c
@@ -17,8 +17,10 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream)
if (err < 0)
goto end;
+ mutex_lock(&efw->mutex);
atomic_inc(&efw->capture_substreams);
err = snd_efw_stream_start_duplex(efw, 0);
+ mutex_unlock(&efw->mutex);
if (err < 0)
snd_efw_stream_lock_release(efw);
@@ -35,8 +37,10 @@ static int midi_playback_open(struct snd_rawmidi_substream *substream)
if (err < 0)
goto end;
+ mutex_lock(&efw->mutex);
atomic_inc(&efw->playback_substreams);
err = snd_efw_stream_start_duplex(efw, 0);
+ mutex_unlock(&efw->mutex);
if (err < 0)
snd_efw_stream_lock_release(efw);
end:
@@ -47,8 +51,10 @@ static int midi_capture_close(struct snd_rawmidi_substream *substream)
{
struct snd_efw *efw = substream->rmidi->private_data;
+ mutex_lock(&efw->mutex);
atomic_dec(&efw->capture_substreams);
snd_efw_stream_stop_duplex(efw);
+ mutex_unlock(&efw->mutex);
snd_efw_stream_lock_release(efw);
return 0;
@@ -58,8 +64,10 @@ static int midi_playback_close(struct snd_rawmidi_substream *substream)
{
struct snd_efw *efw = substream->rmidi->private_data;
+ mutex_lock(&efw->mutex);
atomic_dec(&efw->playback_substreams);
snd_efw_stream_stop_duplex(efw);
+ mutex_unlock(&efw->mutex);
snd_efw_stream_lock_release(efw);
return 0;
diff --git a/sound/firewire/fireworks/fireworks_pcm.c b/sound/firewire/fireworks/fireworks_pcm.c
index d27135b..69f15a6 100644
--- a/sound/firewire/fireworks/fireworks_pcm.c
+++ b/sound/firewire/fireworks/fireworks_pcm.c
@@ -251,8 +251,11 @@ static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
if (err < 0)
return err;
- if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
+ mutex_lock(&efw->mutex);
atomic_inc(&efw->capture_substreams);
+ mutex_unlock(&efw->mutex);
+ }
amdtp_am824_set_pcm_format(&efw->tx_stream, params_format(hw_params));
@@ -269,8 +272,11 @@ static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
if (err < 0)
return err;
- if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
+ mutex_lock(&efw->mutex);
atomic_inc(&efw->playback_substreams);
+ mutex_unlock(&efw->mutex);
+ }
amdtp_am824_set_pcm_format(&efw->rx_stream, params_format(hw_params));
@@ -281,8 +287,11 @@ static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
{
struct snd_efw *efw = substream->private_data;
- if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+ if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
+ mutex_lock(&efw->mutex);
atomic_dec(&efw->capture_substreams);
+ mutex_unlock(&efw->mutex);
+ }
snd_efw_stream_stop_duplex(efw);
@@ -292,8 +301,11 @@ static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
{
struct snd_efw *efw = substream->private_data;
- if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+ if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
+ mutex_lock(&efw->mutex);
atomic_dec(&efw->playback_substreams);
+ mutex_unlock(&efw->mutex);
+ }
snd_efw_stream_stop_duplex(efw);
diff --git a/sound/firewire/fireworks/fireworks_stream.c b/sound/firewire/fireworks/fireworks_stream.c
index 759f6e3..6930745 100644
--- a/sound/firewire/fireworks/fireworks_stream.c
+++ b/sound/firewire/fireworks/fireworks_stream.c
@@ -214,8 +214,6 @@ int snd_efw_stream_start_duplex(struct snd_efw *efw, unsigned int rate)
unsigned int curr_rate;
int err = 0;
- mutex_lock(&efw->mutex);
-
/* Need no substreams */
if ((atomic_read(&efw->playback_substreams) == 0) &&
(atomic_read(&efw->capture_substreams) == 0))
@@ -286,7 +284,6 @@ int snd_efw_stream_start_duplex(struct snd_efw *efw, unsigned int rate)
}
}
end:
- mutex_unlock(&efw->mutex);
return err;
}
@@ -307,16 +304,12 @@ void snd_efw_stream_stop_duplex(struct snd_efw *efw)
master_substreams = &efw->capture_substreams;
}
- mutex_lock(&efw->mutex);
-
if (atomic_read(slave_substreams) == 0) {
stop_stream(efw, slave);
if (atomic_read(master_substreams) == 0)
stop_stream(efw, master);
}
-
- mutex_unlock(&efw->mutex);
}
void snd_efw_stream_update_duplex(struct snd_efw *efw)
--
2.1.4
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