snd_dmaengine_pcm_register() can be passed a NULL pointer for the config which means that the we have to test for pcm->config being non NULL before accessing it. Make the code more straight forward by providing a default config when none is passed.

Signed-off-by: Sascha Hauer s.hauer@pengutronix.de --- sound/soc/soc-generic-dmaengine-pcm.c | 55 ++++++++++++--------------- 1 file changed, 24 insertions(+), 31 deletions(-)

diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c index 0f6c9c55a22d6..734d46b9783f7 100644 --- a/sound/soc/soc-generic-dmaengine-pcm.c +++ b/sound/soc/soc-generic-dmaengine-pcm.c @@ -79,29 +79,19 @@ static int dmaengine_pcm_hw_params(struct snd_soc_component *component, { struct dmaengine_pcm *pcm = soc_component_to_pcm(component); struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream); - int (*prepare_slave_config)(struct snd_pcm_substream *substream, - struct snd_pcm_hw_params *params, - struct dma_slave_config *slave_config); struct dma_slave_config slave_config; + int ret;

- memset(&slave_config, 0, sizeof(slave_config)); - - if (!pcm->config) - prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config; - else - prepare_slave_config = pcm->config->prepare_slave_config; + if (!pcm->config->prepare_slave_config) + return 0;

- if (prepare_slave_config) { - int ret = prepare_slave_config(substream, params, &slave_config); - if (ret) - return ret; + memset(&slave_config, 0, sizeof(slave_config));

- ret = dmaengine_slave_config(chan, &slave_config); - if (ret) - return ret; - } + ret = pcm->config->prepare_slave_config(substream, params, &slave_config); + if (ret) + return ret;

- return 0; + return dmaengine_slave_config(chan, &slave_config); }

static int @@ -121,7 +111,7 @@ dmaengine_pcm_set_runtime_hwparams(struct snd_soc_component *component, return -EINVAL; }

- if (pcm->config && pcm->config->pcm_hardware) + if (pcm->config->pcm_hardware) return snd_soc_set_runtime_hwparams(substream, pcm->config->pcm_hardware);

@@ -188,7 +178,6 @@ static struct dma_chan *dmaengine_pcm_compat_request_channel( { struct dmaengine_pcm *pcm = soc_component_to_pcm(component); struct snd_dmaengine_dai_dma_data *dma_data; - dma_filter_fn fn = NULL;

if (rtd->num_cpus > 1) { dev_err(rtd->dev, @@ -201,13 +190,11 @@ static struct dma_chan *dmaengine_pcm_compat_request_channel( if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0]) return pcm->chan[0];

- if (pcm->config && pcm->config->compat_request_channel) + if (pcm->config->compat_request_channel) return pcm->config->compat_request_channel(rtd, substream);

- if (pcm->config) - fn = pcm->config->compat_filter_fn; - - return snd_dmaengine_pcm_request_channel(fn, dma_data->filter_data); + return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn, + dma_data->filter_data); }

static bool dmaengine_pcm_can_report_residue(struct device *dev, @@ -239,7 +226,7 @@ static int dmaengine_pcm_new(struct snd_soc_component *component, size_t max_buffer_size; unsigned int i;

- if (config && config->prealloc_buffer_size) { + if (config->prealloc_buffer_size) { prealloc_buffer_size = config->prealloc_buffer_size; max_buffer_size = config->pcm_hardware->buffer_bytes_max; } else { @@ -252,7 +239,7 @@ static int dmaengine_pcm_new(struct snd_soc_component *component, if (!substream) continue;

- if (!pcm->chan[i] && config && config->chan_names[i]) + if (!pcm->chan[i] && config->chan_names[i]) pcm->chan[i] = dma_request_slave_channel(dev, config->chan_names[i]);

@@ -365,10 +352,10 @@ static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm, struct dma_chan *chan;

if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || (!dev->of_node && - !(config && config->dma_dev && config->dma_dev->of_node))) + !(config->dma_dev && config->dma_dev->of_node))) return 0;

- if (config && config->dma_dev) { + if (config->dma_dev) { /* * If this warning is seen, it probably means that your Linux * device structure does not match your HW device structure. @@ -385,7 +372,7 @@ static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm, name = "rx-tx"; else name = dmaengine_pcm_dma_channel_names[i]; - if (config && config->chan_names[i]) + if (config->chan_names[i]) name = config->chan_names[i]; chan = dma_request_chan(dev, name); if (IS_ERR(chan)) { @@ -423,6 +410,10 @@ static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm) } }

+static const struct snd_dmaengine_pcm_config snd_dmaengine_pcm_default_config = { + .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, +}; + /** * snd_dmaengine_pcm_register - Register a dmaengine based PCM device * @dev: The parent device for the PCM device @@ -443,6 +434,8 @@ int snd_dmaengine_pcm_register(struct device *dev, #ifdef CONFIG_DEBUG_FS pcm->component.debugfs_prefix = "dma"; #endif + if (!config) + config = &snd_dmaengine_pcm_default_config; pcm->config = config; pcm->flags = flags;

@@ -450,7 +443,7 @@ int snd_dmaengine_pcm_register(struct device *dev, if (ret) goto err_free_dma;

- if (config && config->process) + if (config->process) driver = &dmaengine_pcm_component_process; else driver = &dmaengine_pcm_component;