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ASoC: fix oops w/ for_each_rtd_codec_dai_rollback() macro 

A kernel oops happens on an error case (usual missing BE mixer
configuration required by Intel SST driver). Git bisect points to this
macro and an operator precedence issue.

	for (; ((i--) >= 0) && ((dai) = rtd->codec_dais[i]);)

The initial code replaced by this macro was
	while (--i >= 0) {
		codec_dai = rtd->codec_dais[i];

Fix the C operator precedence difference by reverting to pre-decrement

Fixes: 0b7990e389 ('ASoC: add for_each_rtd_codec_dai() macro')
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2018-10-26 16:54:43 -05:00 committed by Mark Brown
parent 409fa67a7f
commit 23cb2d04db
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GPG Key ID: 24D68B725D5487D0
1 changed files with 1 additions and 1 deletions
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2
include/sound/soc.h
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@ -1192,7 +1192,7 @@ struct snd_soc_pcm_runtime {
((i) < rtd->num_codecs) && ((dai) = rtd->codec_dais[i]); \
(i)++)
#define for_each_rtd_codec_dai_rollback(rtd, i, dai) \
for (; ((i--) >= 0) && ((dai) = rtd->codec_dais[i]);)
for (; ((--i) >= 0) && ((dai) = rtd->codec_dais[i]);)
/* mixer control */