ALSA: hda - check proper return value

snd_hda_param_read() return value -1 means error, others are responses

Signed-off-by: Wang Xingchao <xingchao.wang@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
index 1dd9dbeeef6e686cbce1055a9075e846ba89ea63..7e46258fc7002e24eeb1159e49b05d157a534995 100644 (file)
--- a/sound/pci/hda/hda_proc.c
+++ b/sound/pci/hda/hda_proc.c
@@ -451,7 +451,7 @@ static void print_power_state(struct snd_info_buffer *buffer,
        int sup = snd_hda_param_read(codec, nid, AC_PAR_POWER_STATE);
        int pwr = snd_hda_codec_read(codec, nid, 0,
                                     AC_VERB_GET_POWER_STATE, 0);
-       if (sup)
+       if (sup != -1)
                snd_iprintf(buffer, "  Power states: %s\n",
                            bits_names(sup, names, ARRAY_SIZE(names)));