ALSA: fix incorrect rounding direction in snd_interval_ratnum()

The direction of rounding is incorrect in the snd_interval_ratnum()
It was detected with following parameters (sb8 driver playing
8kHz stereo file):
 - num is always 1000000
 - requested frequency rate is from 7999 to 7999 (single frequency)

The first loop calculates div_down(num, freq->min) which is 125.
Thus, a frequency range's minimum value is 1000000 / 125 = 8000 Hz.
The second loop calculates div_up(num, freq->max) which is 126
The frequency range's maximum value is 1000000 / 126 = 7936 Hz.
The range maximum is lower than the range minimum so the function
fails due to empty result range.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 30f410832a25991c44e2f71efcebb63abdb2b232..a27545b23ee9ff031e8eb98346a492516db42b8b 100644 (file)
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -758,7 +758,7 @@ int snd_interval_ratnum(struct snd_interval *i,
                int diff;
                if (q == 0)
                        q = 1;
-               den = div_down(num, q);
+               den = div_up(num, q);
                if (den < rats[k].den_min)
                        continue;
                if (den > rats[k].den_max)
@@ -794,7 +794,7 @@ int snd_interval_ratnum(struct snd_interval *i,
                        i->empty = 1;
                        return -EINVAL;
                }
-               den = div_up(num, q);
+               den = div_down(num, q);
                if (den > rats[k].den_max)
                        continue;
                if (den < rats[k].den_min)