ALSA: fm801: Gracefully handle failure of tuner auto-detect

Commit 9676001559fce06e37c7dc230ab275f605556176
("ALSA: fm801: add error handling if auto-detect fails") seems to
break systems that were previously working without a tuner.

As a bonus, this should fix init and cleanup for the case where the
tuner is explicitly disabled.

Reported-and-tested-by: Hor Jiun Shyong <jiunshyong@gmail.com>
References: http://bugs.debian.org/641946
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: stable@kernel.org [v3.0+]
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 10 insertions, 3 deletions

diff --git a/sound/pci/fm801.c b/sound/pci/fm801.c
index a96456daf393..32b02d906703 100644
--- a/sound/pci/fm801.c
+++ b/sound/pci/fm801.c
@@ -68,6 +68,7 @@ MODULE_PARM_DESC(enable, "Enable FM801 soundcard.");
 module_param_array(tea575x_tuner, int, NULL, 0444);
 MODULE_PARM_DESC(tea575x_tuner, "TEA575x tuner access method (0 = auto, 1 = SF256-PCS, 2=SF256-PCP, 3=SF64-PCR, 8=disable, +16=tuner-only).");
 
+#define TUNER_DISABLED          (1<<3)
 #define TUNER_ONLY              (1<<4)
 #define TUNER_TYPE_MASK         (~TUNER_ONLY & 0xFFFF)
 
@@ -1150,7 +1151,8 @@ static int snd_fm801_free(struct fm801 *chip)
 
       __end_hw:
 #ifdef CONFIG_SND_FM801_TEA575X_BOOL
-        snd_tea575x_exit(&chip->tea);
+        if (!(chip->tea575x_tuner & TUNER_DISABLED))
+                snd_tea575x_exit(&chip->tea);
 #endif
         if (chip->irq >= 0)
                 free_irq(chip->irq, chip);
@@ -1250,10 +1252,15 @@ static int __devinit snd_fm801_create(struct snd_card *card,
                 }
                 if (tea575x_tuner == 4) {
                         snd_printk(KERN_ERR "TEA575x radio not found\n");
-                        return -ENODEV;
+                        chip->tea575x_tuner = TUNER_DISABLED;
                 }
         }
-        strlcpy(chip->tea.card, snd_fm801_tea575x_gpios[(tea575x_tuner & TUNER_TYPE_MASK) - 1].name, sizeof(chip->tea.card));
+        if (!(chip->tea575x_tuner & TUNER_DISABLED)) {
+                strlcpy(chip->tea.card,
+                        snd_fm801_tea575x_gpios[(tea575x_tuner &
+                                                 TUNER_TYPE_MASK) - 1].name,
+                        sizeof(chip->tea.card));
+        }
 #endif
 
         *rchip = chip;