intel_th: Streamline the subdevice tree accessors

Make to_intel_th*() accessors available from the main header file.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>

drivers/hwtracing/intel_th/core.c

@@ -156,21 +156,6 @@ static struct device_type intel_th_source_device_type = {
 	.release	= intel_th_device_release,
 };
 
-static struct intel_th *to_intel_th(struct intel_th_device *thdev)
-{
-	/*
-	 * subdevice tree is flat: if this one is not a switch, its
-	 * parent must be
-	 */
-	if (thdev->type != INTEL_TH_SWITCH)
-		thdev = to_intel_th_hub(thdev);
-
-	if (WARN_ON_ONCE(!thdev || thdev->type != INTEL_TH_SWITCH))
-		return NULL;
-
-	return dev_get_drvdata(thdev->dev.parent);
-}
-
 static char *intel_th_output_devnode(struct device *dev, umode_t *mode,
 				     kuid_t *uid, kgid_t *gid)
 {

drivers/hwtracing/intel_th/intel_th.h

@@ -173,7 +173,7 @@ struct intel_th_driver {
 	((_d) ? to_intel_th_driver(_d) : NULL)
 
 static inline struct intel_th_device *
-to_intel_th_hub(struct intel_th_device *thdev)
+to_intel_th_parent(struct intel_th_device *thdev)
 {
 	struct device *parent = thdev->dev.parent;
 
@@ -183,6 +183,29 @@ to_intel_th_hub(struct intel_th_device *thdev)
 	return to_intel_th_device(parent);
 }
 
+static inline struct intel_th_device *
+to_intel_th_hub(struct intel_th_device *thdev)
+{
+	/*
+	 * subdevice tree is flat: if this one is not a switch, its
+	 * parent must be
+	 */
+	if (thdev->type == INTEL_TH_SWITCH)
+		return thdev;
+
+	return to_intel_th_parent(thdev);
+}
+
+static inline struct intel_th *to_intel_th(struct intel_th_device *thdev)
+{
+	thdev = to_intel_th_hub(thdev);
+
+	if (WARN_ON_ONCE(!thdev || thdev->type != INTEL_TH_SWITCH))
+		return NULL;
+
+	return dev_get_drvdata(thdev->dev.parent);
+}
+
 struct intel_th *
 intel_th_alloc(struct device *dev, struct resource *devres,
 	       unsigned int ndevres, int irq);