Linux-libre 4.6.2-gnu

1 files changed, 27 insertions, 2 deletions

diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c
index 69ead7150..607bbeaeb 100644
--- a/sound/hda/hdac_i915.c
+++ b/sound/hda/hdac_i915.c
@@ -166,6 +166,8 @@ EXPORT_SYMBOL_GPL(snd_hdac_i915_set_bclk);
  */
 static int pin2port(hda_nid_t pin_nid)
 {
+	if (WARN_ON(pin_nid < 5 || pin_nid > 7))
+		return -1;
 	return pin_nid - 4;
 }
 
@@ -184,10 +186,14 @@ static int pin2port(hda_nid_t pin_nid)
 int snd_hdac_sync_audio_rate(struct hdac_bus *bus, hda_nid_t nid, int rate)
 {
 	struct i915_audio_component *acomp = bus->audio_component;
+	int port;
 
 	if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate)
 		return -ENODEV;
-	return acomp->ops->sync_audio_rate(acomp->dev, pin2port(nid), rate);
+	port = pin2port(nid);
+	if (port < 0)
+		return -EINVAL;
+	return acomp->ops->sync_audio_rate(acomp->dev, port, rate);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
 
@@ -215,11 +221,15 @@ int snd_hdac_acomp_get_eld(struct hdac_bus *bus, hda_nid_t nid,
 			   bool *audio_enabled, char *buffer, int max_bytes)
 {
 	struct i915_audio_component *acomp = bus->audio_component;
+	int port;
 
 	if (!acomp || !acomp->ops || !acomp->ops->get_eld)
 		return -ENODEV;
 
-	return acomp->ops->get_eld(acomp->dev, pin2port(nid), audio_enabled,
+	port = pin2port(nid);
+	if (port < 0)
+		return -EINVAL;
+	return acomp->ops->get_eld(acomp->dev, port, audio_enabled,
 				   buffer, max_bytes);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
@@ -297,6 +307,18 @@ int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops
 }
 EXPORT_SYMBOL_GPL(snd_hdac_i915_register_notifier);
 
+/* check whether intel graphics is present */
+static bool i915_gfx_present(void)
+{
+	static struct pci_device_id ids[] = {
+		{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_ANY_ID),
+		  .class = PCI_BASE_CLASS_DISPLAY << 16,
+		  .class_mask = 0xff << 16 },
+		{}
+	};
+	return pci_dev_present(ids);
+}
+
 /**
  * snd_hdac_i915_init - Initialize i915 audio component
  * @bus: HDA core bus
@@ -316,6 +338,9 @@ int snd_hdac_i915_init(struct hdac_bus *bus)
 	struct i915_audio_component *acomp;
 	int ret;
 
+	if (!i915_gfx_present())
+		return -ENODEV;
+
 	acomp = kzalloc(sizeof(*acomp), GFP_KERNEL);
 	if (!acomp)
 		return -ENOMEM;