[alsa-devel] [PATCH 1/5] ALSA: pcm: snd_interval_step: drop the min parameter

[Clemens Ladisch]

The min parameter was not used by any caller.  And if it were used,
underflows in the calculations could lead to incorrect results.

Signed-off-by: Clemens Ladisch <clemens at ladisch.de>
---
 sound/core/pcm_lib.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 9acc77e..6fd5e1c 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -1113,16 +1113,16 @@ int snd_interval_list(struct snd_interval *i, unsigned int count,

 EXPORT_SYMBOL(snd_interval_list);

-static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
+static int snd_interval_step(struct snd_interval *i, unsigned int step)
 {
 	unsigned int n;
 	int changed = 0;
-	n = (i->min - min) % step;
+	n = i->min % step;
 	if (n != 0 || i->openmin) {
 		i->min += step - n;
 		changed = 1;
 	}
-	n = (i->max - min) % step;
+	n = i->max % step;
 	if (n != 0 || i->openmax) {
 		i->max -= n;
 		changed = 1;
@@ -1427,7 +1427,7 @@ static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
 				struct snd_pcm_hw_rule *rule)
 {
 	unsigned long step = (unsigned long) rule->private;
-	return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
+	return snd_interval_step(hw_param_interval(params, rule->var), step);
 }

 /**