Bluetooth: Convert Marvell driver to use per adapter debugfs

The debugfs support of the Marvell driver is buggy. It is limited to one
controller per system. Fix this by using the controller specific debugfs
directory as parent.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/btmrvl_debugfs.c

@@ -26,7 +26,8 @@
 #include "btmrvl_drv.h"
 
 struct btmrvl_debugfs_data {
-	struct dentry *root_dir, *config_dir, *status_dir;
+	struct dentry *config_dir;
+	struct dentry *status_dir;
 
 	/* config */
 	struct dentry *psmode;
@@ -363,6 +364,9 @@ void btmrvl_debugfs_init(struct hci_dev *hdev)
 	struct btmrvl_private *priv = hdev->driver_data;
 	struct btmrvl_debugfs_data *dbg;
 
+	if (!hdev->debugfs)
+		return;
+
 	dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
 	priv->debugfs_data = dbg;
 
@@ -371,9 +375,7 @@ void btmrvl_debugfs_init(struct hci_dev *hdev)
 		return;
 	}
 
-	dbg->root_dir = debugfs_create_dir("btmrvl", NULL);
-
-	dbg->config_dir = debugfs_create_dir("config", dbg->root_dir);
+	dbg->config_dir = debugfs_create_dir("config", hdev->debugfs);
 
 	dbg->psmode = debugfs_create_file("psmode", 0644, dbg->config_dir,
 				hdev->driver_data, &btmrvl_psmode_fops);
@@ -388,7 +390,7 @@ void btmrvl_debugfs_init(struct hci_dev *hdev)
 	dbg->hscfgcmd = debugfs_create_file("hscfgcmd", 0644, dbg->config_dir,
 				hdev->driver_data, &btmrvl_hscfgcmd_fops);
 
-	dbg->status_dir = debugfs_create_dir("status", dbg->root_dir);
+	dbg->status_dir = debugfs_create_dir("status", hdev->debugfs);
 	dbg->curpsmode = debugfs_create_file("curpsmode", 0444,
 						dbg->status_dir,
 						hdev->driver_data,
@@ -425,7 +427,5 @@ void btmrvl_debugfs_remove(struct hci_dev *hdev)
 	debugfs_remove(dbg->txdnldready);
 	debugfs_remove(dbg->status_dir);
 
-	debugfs_remove(dbg->root_dir);
-
 	kfree(dbg);
 }