[PATCH] ASoC: soc-pcm: Shrink stack frame for __soc_pcm_hw_params

[Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx>]

Commit ac950278b087 ("ASoC: add N cpus to M codecs dai link support")
added an additional local params in __soc_pmc_hw_params, for the
CPU side of the DAI. The snd_pcm_hw_params struct is pretty large (604
bytes) and keeping two local copies of it makes the stack frame for
__soc_pcm_hw_params really large. As the two copies are only used
sequentially combine these into a single local variable to shrink the
stack frame.

Signed-off-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx>
---
 sound/soc/soc-pcm.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 3aa6b988cb4b4..46917add10560 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -985,6 +985,7 @@ static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
 {
 	struct snd_soc_dai *cpu_dai;
 	struct snd_soc_dai *codec_dai;
+	struct snd_pcm_hw_params tmp_params;
 	int i, ret = 0;
 
 	snd_soc_dpcm_mutex_assert_held(rtd);
@@ -998,7 +999,6 @@ static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
 		goto out;
 
 	for_each_rtd_codec_dais(rtd, i, codec_dai) {
-		struct snd_pcm_hw_params codec_params;
 		unsigned int tdm_mask = snd_soc_dai_tdm_mask_get(codec_dai, substream->stream);
 
 		/*
@@ -1019,23 +1019,22 @@ static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
 			continue;
 
 		/* copy params for each codec */
-		codec_params = *params;
+		tmp_params = *params;
 
 		/* fixup params based on TDM slot masks */
 		if (tdm_mask)
-			soc_pcm_codec_params_fixup(&codec_params, tdm_mask);
+			soc_pcm_codec_params_fixup(&tmp_params, tdm_mask);
 
 		ret = snd_soc_dai_hw_params(codec_dai, substream,
-					    &codec_params);
+					    &tmp_params);
 		if(ret < 0)
 			goto out;
 
-		soc_pcm_set_dai_params(codec_dai, &codec_params);
-		snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
+		soc_pcm_set_dai_params(codec_dai, &tmp_params);
+		snd_soc_dapm_update_dai(substream, &tmp_params, codec_dai);
 	}
 
 	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
-		struct snd_pcm_hw_params cpu_params;
 		unsigned int ch_mask = 0;
 		int j;
 
@@ -1047,7 +1046,7 @@ static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
 			continue;
 
 		/* copy params for each cpu */
-		cpu_params = *params;
+		tmp_params = *params;
 
 		if (!rtd->dai_link->codec_ch_maps)
 			goto hw_params;
@@ -1062,16 +1061,16 @@ static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
 
 		/* fixup cpu channel number */
 		if (ch_mask)
-			soc_pcm_codec_params_fixup(&cpu_params, ch_mask);
+			soc_pcm_codec_params_fixup(&tmp_params, ch_mask);
 
 hw_params:
-		ret = snd_soc_dai_hw_params(cpu_dai, substream, &cpu_params);
+		ret = snd_soc_dai_hw_params(cpu_dai, substream, &tmp_params);
 		if (ret < 0)
 			goto out;
 
 		/* store the parameters for each DAI */
-		soc_pcm_set_dai_params(cpu_dai, &cpu_params);
-		snd_soc_dapm_update_dai(substream, &cpu_params, cpu_dai);
+		soc_pcm_set_dai_params(cpu_dai, &tmp_params);
+		snd_soc_dapm_update_dai(substream, &tmp_params, cpu_dai);
 	}
 
 	ret = snd_soc_pcm_component_hw_params(substream, params);
-- 
2.30.2