On Thu, Jul 25, 2013 at 11:13:14AM +0200, Jean-Francois Moine wrote:

In the kirkwood pcm/dma driver, the private stream related data pointer was hold in the platform drvdata. As this pointer may be used by other parts of the audio subsystem, this patch uses the substream runtime private data pointer instead.

There's a much better solution to this, which is to get rid of kirkwood_dma_priv entirely:

diff --git a/sound/soc/kirkwood/kirkwood-dma.c b/sound/soc/kirkwood/kirkwood-dma.c index d3d4bdc..112c262 100644 --- a/sound/soc/kirkwood/kirkwood-dma.c +++ b/sound/soc/kirkwood/kirkwood-dma.c @@ -33,11 +33,11 @@ SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE | \ SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE)

-struct kirkwood_dma_priv { - struct snd_pcm_substream *play_stream; - struct snd_pcm_substream *rec_stream; - struct kirkwood_dma_data *data; -}; +static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs) +{ + struct snd_soc_pcm_runtime *soc_runtime = subs->private_data; + return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai); +}

static struct snd_pcm_hardware kirkwood_dma_snd_hw = { .info = (SNDRV_PCM_INFO_INTERLEAVED | @@ -63,8 +63,7 @@ static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32);

static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id) { - struct kirkwood_dma_priv *prdata = dev_id; - struct kirkwood_dma_data *priv = prdata->data; + struct kirkwood_dma_data *priv = dev_id; unsigned long mask, status, cause;

mask = readl(priv->io + KIRKWOOD_INT_MASK); @@ -89,10 +88,10 @@ static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id) writel(status, priv->io + KIRKWOOD_INT_CAUSE);

if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES) - snd_pcm_period_elapsed(prdata->play_stream); + snd_pcm_period_elapsed(priv->substream_play);

if (status & KIRKWOOD_INT_CAUSE_REC_BYTES) - snd_pcm_period_elapsed(prdata->rec_stream); + snd_pcm_period_elapsed(priv->substream_rec);

return IRQ_HANDLED; } @@ -126,15 +125,10 @@ static int kirkwood_dma_open(struct snd_pcm_substream *substream) { int err; struct snd_pcm_runtime *runtime = substream->runtime; - struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; - struct snd_soc_platform *platform = soc_runtime->platform; - struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; - struct kirkwood_dma_data *priv; - struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform); + struct kirkwood_dma_data *priv = kirkwood_priv(substream); const struct mbus_dram_target_info *dram; unsigned long addr;

- priv = snd_soc_dai_get_dma_data(cpu_dai, substream); snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);

/* Ensure that all constraints linked to dma burst are fulfilled */ @@ -157,21 +151,11 @@ static int kirkwood_dma_open(struct snd_pcm_substream *substream) if (err < 0) return err;

- if (prdata == NULL) { - prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL); - if (prdata == NULL) - return -ENOMEM; - - prdata->data = priv; - + if (!priv->substream_play && !priv->substream_rec) { err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED, - "kirkwood-i2s", prdata); - if (err) { - kfree(prdata); + "kirkwood-i2s", priv); + if (err) return -EBUSY; - } - - snd_soc_platform_set_drvdata(platform, prdata);

/* * Enable Error interrupts. We're only ack'ing them but @@ -183,11 +167,11 @@ static int kirkwood_dma_open(struct snd_pcm_substream *substream) dram = mv_mbus_dram_info(); addr = substream->dma_buffer.addr; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { - prdata->play_stream = substream; + priv->substream_play = substream; kirkwood_dma_conf_mbus_windows(priv->io, KIRKWOOD_PLAYBACK_WIN, addr, dram); } else { - prdata->rec_stream = substream; + priv->substream_rec = substream; kirkwood_dma_conf_mbus_windows(priv->io, KIRKWOOD_RECORD_WIN, addr, dram); } @@ -197,27 +181,19 @@ static int kirkwood_dma_open(struct snd_pcm_substream *substream)

static int kirkwood_dma_close(struct snd_pcm_substream *substream) { - struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; - struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; - struct snd_soc_platform *platform = soc_runtime->platform; - struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform); - struct kirkwood_dma_data *priv; - - priv = snd_soc_dai_get_dma_data(cpu_dai, substream); + struct kirkwood_dma_data *priv = kirkwood_priv(substream);

- if (!prdata || !priv) + if (!priv) return 0;

if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) - prdata->play_stream = NULL; + priv->substream_play = NULL; else - prdata->rec_stream = NULL; + priv->substream_rec = NULL;

- if (!prdata->play_stream && !prdata->rec_stream) { + if (!priv->substream_play && !priv->substream_rec) { writel(0, priv->io + KIRKWOOD_ERR_MASK); - free_irq(priv->irq, prdata); - kfree(prdata); - snd_soc_platform_set_drvdata(platform, NULL); + free_irq(priv->irq, priv); }

return 0; @@ -243,13 +219,9 @@ static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream) static int kirkwood_dma_prepare(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; - struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; - struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; - struct kirkwood_dma_data *priv; + struct kirkwood_dma_data *priv = kirkwood_priv(substream); unsigned long size, count;

- priv = snd_soc_dai_get_dma_data(cpu_dai, substream); - /* compute buffer size in term of "words" as requested in specs */ size = frames_to_bytes(runtime, runtime->buffer_size); size = (size>>2)-1; @@ -272,13 +244,9 @@ static int kirkwood_dma_prepare(struct snd_pcm_substream *substream) static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream *substream) { - struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; - struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; - struct kirkwood_dma_data *priv; + struct kirkwood_dma_data *priv = kirkwood_priv(substream); snd_pcm_uframes_t count;

- priv = snd_soc_dai_get_dma_data(cpu_dai, substream); - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) count = bytes_to_frames(substream->runtime, readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT)); diff --git a/sound/soc/kirkwood/kirkwood.h b/sound/soc/kirkwood/kirkwood.h index 4d92637..10a3aaa 100644 --- a/sound/soc/kirkwood/kirkwood.h +++ b/sound/soc/kirkwood/kirkwood.h @@ -129,6 +129,8 @@ struct kirkwood_dma_data { struct clk *extclk; uint32_t ctl_play; uint32_t ctl_rec; + struct snd_pcm_substream *substream_play; + struct snd_pcm_substream *substream_rec; int irq; int burst; };