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authorClemens Ladisch <clemens@ladisch.de>2009-08-25 08:15:41 +0200
committerTakashi Iwai <tiwai@suse.de>2009-08-25 08:52:34 +0200
commitb1ddaf681e362ed453182ddee1699d7487069a16 (patch)
tree60d48ea825579d8df50836fd921668a2320adbe6 /sound
parentedd1365e90eb32625041d09de427d7b03461bc5c (diff)
sound: pcm_lib: fix unsorted list constraint handling
snd_interval_list() expected a sorted list but did not document this, so there are drivers that give it an unsorted list. To fix this, change the algorithm to work with any list. This fixes the "Slave PCM not usable" error with USB devices that have multiple alternate settings with sample rates in decreasing order, such as the Philips Askey VC010 WebCam. http://bugzilla.kernel.org/show_bug.cgi?id=14028 Reported-and-tested-by: Andrzej <adkadk@gmail.com> Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Cc: <stable@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/pcm_lib.c39
1 files changed, 8 insertions, 31 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 333e4dd2945..d8a7bb28cd8 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -909,47 +909,24 @@ static int snd_interval_ratden(struct snd_interval *i,
int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
{
unsigned int k;
- int changed = 0;
+ struct snd_interval list_range;
if (!count) {
i->empty = 1;
return -EINVAL;
}
+ snd_interval_any(&list_range);
+ list_range.min = UINT_MAX;
+ list_range.max = 0;
for (k = 0; k < count; k++) {
if (mask && !(mask & (1 << k)))
continue;
- if (i->min == list[k] && !i->openmin)
- goto _l1;
- if (i->min < list[k]) {
- i->min = list[k];
- i->openmin = 0;
- changed = 1;
- goto _l1;
- }
- }
- i->empty = 1;
- return -EINVAL;
- _l1:
- for (k = count; k-- > 0;) {
- if (mask && !(mask & (1 << k)))
+ if (!snd_interval_test(i, list[k]))
continue;
- if (i->max == list[k] && !i->openmax)
- goto _l2;
- if (i->max > list[k]) {
- i->max = list[k];
- i->openmax = 0;
- changed = 1;
- goto _l2;
- }
+ list_range.min = min(list_range.min, list[k]);
+ list_range.max = max(list_range.max, list[k]);
}
- i->empty = 1;
- return -EINVAL;
- _l2:
- if (snd_interval_checkempty(i)) {
- i->empty = 1;
- return -EINVAL;
- }
- return changed;
+ return snd_interval_refine(i, &list_range);
}
EXPORT_SYMBOL(snd_interval_list);