Messages in this thread Patch in this message | | | From | Krzysztof Kozlowski <> | Subject | [PATCH] ASoC: use inline function for type safety in snd_soc_substream_to_rtd() | Date | Tue, 30 Apr 2024 16:09:38 +0200 |
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A common pattern in sound drivers is getting 'struct snd_soc_pcm_runtime' from 'struct snd_pcm_substream' opaque pointer private_data field with snd_soc_substream_to_rtd(). However 'private_data' appears in several other structures as well, including 'struct snd_compr_stream'. The field might not hold the same type for every structure, although seems the case at least for 'struct snd_compr_stream', so code can easily make a mistake by using macro for wrong structures.
Switch from macro to inline function, so such mistake will be build-time detectable.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> --- include/sound/soc.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/include/sound/soc.h b/include/sound/soc.h index 2a1b6c198547..cacaa92487a0 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -1215,8 +1215,12 @@ struct snd_soc_pcm_runtime { /* see soc_new_pcm_runtime() */ #define snd_soc_rtd_to_cpu(rtd, n) (rtd)->dais[n] #define snd_soc_rtd_to_codec(rtd, n) (rtd)->dais[n + (rtd)->dai_link->num_cpus] -#define snd_soc_substream_to_rtd(substream) \ - (struct snd_soc_pcm_runtime *)snd_pcm_substream_chip(substream) + +static inline struct snd_soc_pcm_runtime * +snd_soc_substream_to_rtd(const struct snd_pcm_substream *substream) +{ + return substream->private_data; +} #define for_each_rtd_components(rtd, i, component) \ for ((i) = 0, component = NULL; \ -- 2.43.0
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