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[ALSA] hda-codec - Add zero checks in input-mux helper functions 

Added zero checks in input-mux helper functions to avoid Oops.
Some devices may have no input pins while the driver registers
control elements calling these functions.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Takashi Iwai 2007-10-09 11:58:41 +02:00 committed by Jaroslav Kysela
parent 2469049e72
commit 5513b0c582
1 changed files with 4 additions and 0 deletions
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4
sound/pci/hda/hda_codec.c
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@ -2341,6 +2341,8 @@ int snd_hda_input_mux_info(const struct hda_input_mux *imux,
uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
uinfo->count = 1; uinfo->count = 1;
uinfo->value.enumerated.items = imux->num_items; uinfo->value.enumerated.items = imux->num_items;
if (!imux->num_items)
return 0;
index = uinfo->value.enumerated.item; index = uinfo->value.enumerated.item;
if (index >= imux->num_items) if (index >= imux->num_items)
index = imux->num_items - 1; index = imux->num_items - 1;
@ -2356,6 +2358,8 @@ int snd_hda_input_mux_put(struct hda_codec *codec,
{ {
unsigned int idx; unsigned int idx;
if (!imux->num_items)
return 0;
idx = ucontrol->value.enumerated.item[0]; idx = ucontrol->value.enumerated.item[0];
if (idx >= imux->num_items) if (idx >= imux->num_items)
idx = imux->num_items - 1; idx = imux->num_items - 1;