ALSA: ymfpci - Don't create invalid PCM & mixers when AC97 doesn't support

- check SDAC bit of AC97 primary codec when create "rear" device 3,
  "4ch" device 2 and "4ch Duplication" switch as the card need a four channels
  AC97 codec to support surround40.

Signed-off-by: Raymond Yau <superquad.vortex2@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 13 insertions, 8 deletions

diff --git a/sound/pci/ymfpci/ymfpci.c b/sound/pci/ymfpci/ymfpci.c
index e57b89e8aa89..94ab728f5ca8 100644
--- a/sound/pci/ymfpci/ymfpci.c
+++ b/sound/pci/ymfpci/ymfpci.c
@@ -286,17 +286,22 @@ static int __devinit snd_card_ymfpci_probe(struct pci_dev *pci,
                 snd_card_free(card);
                 return err;
         }
-        if ((err = snd_ymfpci_pcm_4ch(chip, 2, NULL)) < 0) {
+        err = snd_ymfpci_mixer(chip, rear_switch[dev]);
+        if (err < 0) {
                 snd_card_free(card);
                 return err;
         }
-        if ((err = snd_ymfpci_pcm2(chip, 3, NULL)) < 0) {
-                snd_card_free(card);
-                return err;
-        }
-        if ((err = snd_ymfpci_mixer(chip, rear_switch[dev])) < 0) {
-                snd_card_free(card);
-                return err;
+        if (chip->ac97->ext_id & AC97_EI_SDAC) {
+                err = snd_ymfpci_pcm_4ch(chip, 2, NULL);
+                if (err < 0) {
+                        snd_card_free(card);
+                        return err;
+                }
+                err = snd_ymfpci_pcm2(chip, 3, NULL);
+                if (err < 0) {
+                        snd_card_free(card);
+                        return err;
+                }
         }
         if ((err = snd_ymfpci_timer(chip, 0)) < 0) {
                 snd_card_free(card);