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ALSA: pcm: Use __ffs() instead of ffs() in snd_mask_min() 

The difference between __ffs and ffs is that ffs will return a one based
index whereas __ffs will return a zero based index. Furthermore ffs will
check if the passed value is zero and return zero in that case, whereas
__ffs behavior is undefined if the passed parameter is 0.

Since we already check if the mask is 0 before calling ffs and also subtract
1 from the result __ffs is the better choice.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Lars-Peter Clausen 2014-12-29 19:41:44 +01:00 committed by Takashi Iwai
parent cd9978f1d3
commit 599ee3291a
1 changed files with 1 additions and 1 deletions
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2
include/sound/pcm_params.h
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@ -92,7 +92,7 @@ static inline unsigned int snd_mask_min(const struct snd_mask *mask)
int i; int i;
for (i = 0; i < SNDRV_MASK_SIZE; i++) { for (i = 0; i < SNDRV_MASK_SIZE; i++) {
if (mask->bits[i]) if (mask->bits[i])
return ffs(mask->bits[i]) - 1 + (i << 5); return __ffs(mask->bits[i]) + (i << 5);
} }
return 0; return 0;
} }