ALSA: hda - Allow calling snd_hdac_i915_*() without actual binding

Add the missing NULL checks so that snd_hdac_i915*() can be called
even after the binding with i915 failed.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c
index cb78c25..442500e 100644 (file)
--- a/sound/hda/hdac_i915.c
+++ b/sound/hda/hdac_i915.c
@@ -27,7 +27,7 @@ int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
 {
        struct i915_audio_component *acomp = bus->audio_component;
 
-       if (!acomp->ops)
+       if (!acomp || !acomp->ops)
                return -ENODEV;
 
        if (!acomp->ops->codec_wake_override) {
@@ -49,7 +49,7 @@ int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
 {
        struct i915_audio_component *acomp = bus->audio_component;
 
-       if (!acomp->ops)
+       if (!acomp || !acomp->ops)
                return -ENODEV;
 
        dev_dbg(bus->dev, "display power %s\n",
@@ -72,7 +72,7 @@ int snd_hdac_get_display_clk(struct hdac_bus *bus)
 {
        struct i915_audio_component *acomp = bus->audio_component;
 
-       if (!acomp->ops)
+       if (!acomp || !acomp->ops)
                return -ENODEV;
 
        return acomp->ops->get_cdclk_freq(acomp->dev);
@@ -179,8 +179,11 @@ int snd_hdac_i915_exit(struct hdac_bus *bus)
        struct device *dev = bus->dev;
        struct i915_audio_component *acomp = bus->audio_component;
 
+       if (!acomp)
+               return 0;
+
        WARN_ON(bus->i915_power_refcount);
-       if (bus->i915_power_refcount > 0 && acomp && acomp->ops)
+       if (bus->i915_power_refcount > 0 && acomp->ops)
                acomp->ops->put_power(acomp->dev);
 
        component_master_del(dev, &hdac_component_master_ops);