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WSL2-Linux-Kernel
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greybus: audio: Remove redundant lock protection & is_connected field 

Each module maintains connected status & a lock to protect it.
Using codec->lock we can safely serialize ASoC specific callbacks
(in response to mixer_ctl update or dai_ops) and gb module
disconnect. Thus is_connected field can be removed.

Signed-off-by: Vaibhav Agarwal <vaibhav.agarwal@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Vaibhav Agarwal 2016-05-04 16:29:21 +05:30 коммит произвёл Greg Kroah-Hartman
Родитель e6ab7a154c
Коммит 852859ab81
3 изменённых файлов: 0 добавлений и 67 удалений
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56
drivers/staging/greybus/audio_codec.c
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@ -60,7 +60,6 @@ static int gbaudio_module_disable(struct gbaudio_codec_info *codec,
dai_name = codec->stream[dir].dai_name;
mutex_lock(&module->lock);
module_state = module->ctrlstate[dir];
if (module_state == GBAUDIO_CODEC_SHUTDOWN) {
dev_dbg(codec->dev, "%s: module already configured\n",
@ -129,7 +128,6 @@ static int gbaudio_module_disable(struct gbaudio_codec_info *codec,
module->ctrlstate[dir] = GBAUDIO_CODEC_SHUTDOWN;
func_exit:
mutex_unlock(&module->lock);
mutex_unlock(&codec->lock);
return ret;
}
@ -160,7 +158,6 @@ static int gbaudio_module_enable(struct gbaudio_codec_info *codec,
rate = codec->stream[dir].rate;
sig_bits = codec->stream[dir].sig_bits;
mutex_lock(&module->lock);
module_state = module->ctrlstate[dir];
if (module_state == codec_state) {
dev_dbg(codec->dev, "%s: module already configured\n",
@ -272,7 +269,6 @@ static int gbaudio_module_enable(struct gbaudio_codec_info *codec,
func_exit:
module->ctrlstate[dir] = module_state;
mutex_unlock(&module->lock);
mutex_unlock(&codec->lock);
return ret;
}
@ -342,18 +338,11 @@ static int gbcodec_startup(struct snd_pcm_substream *substream,
state = codec->stream[substream->stream].state;
list_for_each_entry(module, &codec->module_list, list) {
mutex_lock(&module->lock);
if (!module->is_connected) {
mutex_unlock(&module->lock);
continue;
}
/* find the dai */
data = find_data(module, dai->name);
if (!data) {
dev_err(dai->dev, "%s:%s DATA connection missing\n",
dai->name, module->name);
mutex_unlock(&module->lock);
continue;
}
@ -375,7 +364,6 @@ static int gbcodec_startup(struct snd_pcm_substream *substream,
break;
default:
dev_err(dai->dev, "Inavlid stream\n");
mutex_unlock(&module->lock);
mutex_unlock(&codec->lock);
return -EINVAL;
}
@ -384,7 +372,6 @@ static int gbcodec_startup(struct snd_pcm_substream *substream,
state = GBAUDIO_CODEC_STARTUP;
module->ctrlstate[substream->stream] = state;
dev_dbg(dai->dev, "%s: state:%d\n", module->name, state);
mutex_unlock(&module->lock);
}
codec->stream[substream->stream].state = state;
codec->stream[substream->stream].dai_name = dai->name;
@ -492,19 +479,11 @@ static void gbcodec_shutdown(struct snd_pcm_substream *substream,
state = codec->stream[substream->stream].state;
list_for_each_entry(module, &codec->module_list, list) {
mutex_lock(&module->lock);
if (!module->is_connected) {
dev_err(dai->dev, "%s:%s module not connected\n",
__func__, module->name);
mutex_unlock(&module->lock);
continue;
}
/* find the dai */
data = find_data(module, dai->name);
if (!data) {
dev_err(dai->dev, "%s:%s DATA connection missing\n",
dai->name, module->name);
mutex_unlock(&module->lock);
continue;
}
@ -523,7 +502,6 @@ static void gbcodec_shutdown(struct snd_pcm_substream *substream,
state = GBAUDIO_CODEC_SHUTDOWN;
module->ctrlstate[substream->stream] = state;
dev_dbg(dai->dev, "%s: state:%d\n", module->name, state);
mutex_unlock(&module->lock);
}
codec->stream[substream->stream].state = state;
codec->stream[substream->stream].dai_name = NULL;
@ -583,21 +561,11 @@ static int gbcodec_hw_params(struct snd_pcm_substream *substream,
state = codec->stream[substream->stream].state;
list_for_each_entry(module, &codec->module_list, list) {
mutex_lock(&module->lock);
if (!module->is_connected) {
dev_err(dai->dev, "%s:%s module not connected\n",
__func__, module->name);
ret = -ENODEV;
mutex_unlock(&module->lock);
continue;
}
/* find the data connection */
data = find_data(module, dai->name);
if (!data) {
dev_err(dai->dev, "%s:%s DATA connection missing\n",
dai->name, module->name);
mutex_unlock(&module->lock);
continue;
}
@ -612,7 +580,6 @@ static int gbcodec_hw_params(struct snd_pcm_substream *substream,
format, rate, channels, sig_bits);
if (ret) {
dev_err(dai->dev, "%d: Error during set_pcm\n", ret);
mutex_unlock(&module->lock);
goto func_exit;
}
if (state < GBAUDIO_CODEC_HWPARAMS) {
@ -623,14 +590,12 @@ static int gbcodec_hw_params(struct snd_pcm_substream *substream,
if (ret) {
dev_err(dai->dev,
"%d: Error during set_config\n", ret);
mutex_unlock(&module->lock);
goto func_exit;
}
}
state = GBAUDIO_CODEC_HWPARAMS;
module->ctrlstate[substream->stream] = state;
dev_dbg(dai->dev, "%s: state:%d\n", module->name, state);
mutex_unlock(&module->lock);
}
codec->stream[substream->stream].state = state;
codec->stream[substream->stream].format = format;
@ -731,18 +696,11 @@ static int gbcodec_prepare(struct snd_pcm_substream *substream,
state = codec->stream[substream->stream].state;
list_for_each_entry(module, &codec->module_list, list) {
mutex_lock(&module->lock);
if (!module->is_connected) {
mutex_unlock(&module->lock);
continue;
}
/* find the dai */
data = find_data(module, dai->name);
if (!data) {
dev_err(dai->dev, "%s:%s DATA connection missing\n",
dai->name, module->name);
mutex_unlock(&module->lock);
continue;
}
@ -759,14 +717,12 @@ static int gbcodec_prepare(struct snd_pcm_substream *substream,
if (ret == -ENODEV)
continue;
if (ret) {
mutex_unlock(&module->lock);
goto func_exit;
}
state = GBAUDIO_CODEC_PREPARE;
module->ctrlstate[substream->stream] = state;
dev_dbg(dai->dev, "%s: state:%d\n", module->name, state);
mutex_unlock(&module->lock);
}
codec->stream[substream->stream].state = state;
@ -824,12 +780,6 @@ static int gbcodec_trigger(struct snd_pcm_substream *substream, int cmd,
}
list_for_each_entry(module, &codec->module_list, list) {
mutex_lock(&module->lock);
if (!module->is_connected) {
mutex_unlock(&module->lock);
continue;
}
/* find the dai */
data = find_data(module, dai->name);
if (data)
@ -839,7 +789,6 @@ static int gbcodec_trigger(struct snd_pcm_substream *substream, int cmd,
dev_err(dai->dev, "%s:%s DATA connection missing\n",
dai->name, module->name);
ret = -ENODEV;
mutex_unlock(&module->lock);
goto func_exit;
}
if (start && tx) {
@ -873,7 +822,6 @@ static int gbcodec_trigger(struct snd_pcm_substream *substream, int cmd,
if (ret)
dev_err(dai->dev, "%s:Error during %s stream:%d\n",
module->name, start ? "Start" : "Stop", ret);
mutex_unlock(&module->lock);
func_exit:
mutex_unlock(&codec->lock);
@ -1118,7 +1066,6 @@ void gbaudio_unregister_module(struct gbaudio_module_info *module)
down_write(&card->controls_rwsem);
mutex_lock(&gbcodec->lock);
dev_dbg(codec->dev, "Process Unregister %s module\n", module->name);
mutex_lock(&module->lock);
#ifdef CONFIG_SND_JACK
/* free jack devices for this module from codec->jack_list */
@ -1133,7 +1080,6 @@ void gbaudio_unregister_module(struct gbaudio_module_info *module)
gbaudio_codec_cleanup(module);
module->is_connected = 0;
if (module->dapm_routes) {
dev_dbg(codec->dev, "Removing %d routes\n",
module->num_dapm_routes);
@ -1153,8 +1099,6 @@ void gbaudio_unregister_module(struct gbaudio_module_info *module)
module->num_dapm_widgets);
}
mutex_unlock(&module->lock);
list_del(&module->list);
dev_dbg(codec->dev, "Unregistered %s module\n", module->name);

2
drivers/staging/greybus/audio_codec.h
Просмотреть файл

@ -172,8 +172,6 @@ struct gbaudio_module_info {
struct snd_soc_jack button_jack;
/* used by codec_ops */
struct mutex lock;
int is_connected;
int ctrlstate[2]; /* PB/CAP */
/* connection info */

9
drivers/staging/greybus/audio_module.c
Просмотреть файл

@ -26,12 +26,10 @@ static int gbaudio_request_jack(struct gbaudio_module_info *module,
dev_warn(module->dev, "Jack Event received: type: %u, event: %u\n",
req->jack_attribute, req->event);
mutex_lock(&module->lock);
if (req->event == GB_AUDIO_JACK_EVENT_REMOVAL) {
module->jack_type = 0;
button_status = module->button_status;
module->button_status = 0;
mutex_unlock(&module->lock);
if (button_status)
snd_soc_jack_report(&module->button_jack, 0,
GBCODEC_JACK_BUTTON_MASK);
@ -48,7 +46,6 @@ static int gbaudio_request_jack(struct gbaudio_module_info *module,
module->jack_type, report);
module->jack_type = report;
mutex_unlock(&module->lock);
snd_soc_jack_report(&module->headset_jack, report, GBCODEC_JACK_MASK);
return 0;
@ -63,10 +60,8 @@ static int gbaudio_request_button(struct gbaudio_module_info *module,
req->button_id, req->event);
/* currently supports 4 buttons only */
mutex_lock(&module->lock);
if (!module->jack_type) {
dev_err(module->dev, "Jack not present. Bogus event!!\n");
mutex_unlock(&module->lock);
return -EINVAL;
}
@ -100,8 +95,6 @@ static int gbaudio_request_button(struct gbaudio_module_info *module,
module->button_status = report;
mutex_unlock(&module->lock);
snd_soc_jack_report(&module->button_jack, report,
GBCODEC_JACK_BUTTON_MASK);
@ -247,7 +240,6 @@ static int gb_audio_probe(struct gb_bundle *bundle,
return -ENOMEM;
gbmodule->num_data_connections = bundle->num_cports - 1;
mutex_init(&gbmodule->lock);
INIT_LIST_HEAD(&gbmodule->data_list);
INIT_LIST_HEAD(&gbmodule->widget_list);
INIT_LIST_HEAD(&gbmodule->ctl_list);
@ -327,7 +319,6 @@ static int gb_audio_probe(struct gb_bundle *bundle,
if (ret)
goto disable_data_connection;
}
gbmodule->is_connected = 1;
/* inform above layer for uevent */
dev_dbg(dev, "Inform set_event:%d to above layer\n", 1);