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ALSA: control: Allow to pass items zero to snd_ctl_enum_info() 

Although this is weird, some drivers want to allow empty control
elements intentionally, e.g. the number of items may change depending
on the firmware status.  Let the function simply returning in such a
case.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
hifive-unleashed-5.1
Takashi Iwai 2014-10-20 18:08:50 +02:00
parent df803e1389
commit a7e6fb9915
1 changed files with 2 additions and 0 deletions
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2
sound/core/control.c
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@ -1745,6 +1745,8 @@ int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
info->count = channels;
info->value.enumerated.items = items;
if (!items)
return 0;
if (info->value.enumerated.item >= items)
info->value.enumerated.item = items - 1;
WARN(strlen(names[info->value.enumerated.item]) >= sizeof(info->value.enumerated.name),