AD HD-audio codec driver has a few code lines invoking snd_get_num_conns() and using its return value as the array index without checking. This is basically safe in all those places; at the second and later calls snd_get_num_conns() returns the value cached from the first invocation, hence the value is always consistent.

However, it looks a bit confusing as if a lack of the proper check. This patch introduces a new field num_smux_conns in ad198x_spec for simplifying the code. Now we store and refer to the value more locally without invoking the extra function at each time.

Reported-by: Colin King colin.king@canonical.com Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/pci/hda/patch_analog.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/sound/pci/hda/patch_analog.c b/sound/pci/hda/patch_analog.c index 88c46b051d14..2132b2acec4d 100644 --- a/sound/pci/hda/patch_analog.c +++ b/sound/pci/hda/patch_analog.c @@ -28,6 +28,7 @@ struct ad198x_spec { hda_nid_t eapd_nid;

unsigned int beep_amp; /* beep amp value, set via set_beep_amp() */ + int num_smux_conns; };

@@ -453,8 +454,7 @@ static int ad1983_auto_smux_enum_info(struct snd_kcontrol *kcontrol, struct ad198x_spec *spec = codec->spec; static const char * const texts2[] = { "PCM", "ADC" }; static const char * const texts3[] = { "PCM", "ADC1", "ADC2" }; - hda_nid_t dig_out = spec->gen.multiout.dig_out_nid; - int num_conns = snd_hda_get_num_conns(codec, dig_out); + int num_conns = spec->num_smux_conns;

if (num_conns == 2) return snd_hda_enum_helper_info(kcontrol, uinfo, 2, texts2); @@ -481,7 +481,7 @@ static int ad1983_auto_smux_enum_put(struct snd_kcontrol *kcontrol, struct ad198x_spec *spec = codec->spec; unsigned int val = ucontrol->value.enumerated.item[0]; hda_nid_t dig_out = spec->gen.multiout.dig_out_nid; - int num_conns = snd_hda_get_num_conns(codec, dig_out); + int num_conns = spec->num_smux_conns;

if (val >= num_conns) return -EINVAL; @@ -512,6 +512,7 @@ static int ad1983_add_spdif_mux_ctl(struct hda_codec *codec) num_conns = snd_hda_get_num_conns(codec, dig_out); if (num_conns != 2 && num_conns != 3) return 0; + spec->num_smux_conns = num_conns; if (!snd_hda_gen_add_kctl(&spec->gen, NULL, &ad1983_auto_smux_mixer)) return -ENOMEM; return 0; @@ -730,10 +731,12 @@ static int ad1988_auto_smux_enum_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { struct hda_codec *codec = snd_kcontrol_chip(kcontrol); + struct ad198x_spec *spec = codec->spec; static const char * const texts[] = { "PCM", "ADC1", "ADC2", "ADC3", }; - int num_conns = snd_hda_get_num_conns(codec, 0x0b) + 1; + int num_conns = spec->num_smux_conns; + if (num_conns > 4) num_conns = 4; return snd_hda_enum_helper_info(kcontrol, uinfo, num_conns, texts); @@ -756,7 +759,7 @@ static int ad1988_auto_smux_enum_put(struct snd_kcontrol *kcontrol, struct ad198x_spec *spec = codec->spec; unsigned int val = ucontrol->value.enumerated.item[0]; struct nid_path *path; - int num_conns = snd_hda_get_num_conns(codec, 0x0b) + 1; + int num_conns = spec->num_smux_conns;

if (val >= num_conns) return -EINVAL; @@ -847,6 +850,7 @@ static int ad1988_add_spdif_mux_ctl(struct hda_codec *codec) num_conns = snd_hda_get_num_conns(codec, 0x0b) + 1; if (num_conns != 3 && num_conns != 4) return 0; + spec->num_smux_conns = num_conns;

for (i = 0; i < num_conns; i++) { struct nid_path *path = snd_array_new(&spec->gen.paths);