[ALSA] ac97_bus power management

This patch adds CONFIG_PM to the ac97_bus driver.
Signed-off-by: NMartin Langer <martin-langer@gmx.de>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@suse.cz>

sound/ac97_bus.c

@@ -26,6 +26,7 @@ static int ac97_bus_match(struct device *dev, struct device_driver *drv)
 	return 1;
 }
 
+#ifdef CONFIG_PM
 static int ac97_bus_suspend(struct device *dev, pm_message_t state)
 {
 	int ret = 0;
@@ -45,12 +46,15 @@ static int ac97_bus_resume(struct device *dev)
 
 	return ret;
 }
+#endif /* CONFIG_PM */
 
 struct bus_type ac97_bus_type = {
 	.name		= "ac97",
 	.match		= ac97_bus_match,
+#ifdef CONFIG_PM
 	.suspend	= ac97_bus_suspend,
 	.resume		= ac97_bus_resume,
+#endif /* CONFIG_PM */
 };
 
 static int __init ac97_bus_init(void)