usb: add struct usb_hub_port to store port related members.

Add struct usb_hub_port pointer port_data in the struct usb_hub and allocate
struct usb_hub_port perspectively for each ports to store private data.
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/hub.c

@@ -37,6 +37,10 @@
 #endif
 #endif
 
+struct usb_hub_port {
+	void			*port_owner;
+};
+
 struct usb_hub {
 	struct device		*intfdev;	/* the "interface" device */
 	struct usb_device	*hdev;
@@ -81,7 +85,7 @@ struct usb_hub {
 	u8			indicator[USB_MAXCHILDREN];
 	struct delayed_work	leds;
 	struct delayed_work	init_work;
-	void			**port_owners;
+	struct usb_hub_port	*port_data;
 };
 
 static inline int hub_is_superspeed(struct usb_device *hdev)
@@ -1049,8 +1053,9 @@ static int hub_configure(struct usb_hub *hub,
 
 	hdev->children = kzalloc(hdev->maxchild *
 				sizeof(struct usb_device *), GFP_KERNEL);
-	hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL);
-	if (!hdev->children || !hub->port_owners) {
+	hub->port_data = kzalloc(hdev->maxchild * sizeof(struct usb_hub_port),
+			GFP_KERNEL);
+	if (!hub->port_data || !hdev->children) {
 		ret = -ENOMEM;
 		goto fail;
 	}
@@ -1305,7 +1310,7 @@ static void hub_disconnect(struct usb_interface *intf)
 
 	usb_free_urb(hub->urb);
 	kfree(hdev->children);
-	kfree(hub->port_owners);
+	kfree(hub->port_data);
 	kfree(hub->descriptor);
 	kfree(hub->status);
 	kfree(hub->buffer);
@@ -1437,7 +1442,7 @@ static int find_port_owner(struct usb_device *hdev, unsigned port1,
 	/* This assumes that devices not managed by the hub driver
 	 * will always have maxchild equal to 0.
 	 */
-	*ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]);
+	*ppowner = &(hdev_to_hub(hdev)->port_data[port1 - 1].port_owner);
 	return 0;
 }
 
@@ -1472,16 +1477,14 @@ int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner)
 
 void usb_hub_release_all_ports(struct usb_device *hdev, void *owner)
 {
+	struct usb_hub *hub = hdev_to_hub(hdev);
 	int n;
-	void **powner;
 
-	n = find_port_owner(hdev, 1, &powner);
-	if (n == 0) {
-		for (; n < hdev->maxchild; (++n, ++powner)) {
-			if (*powner == owner)
-				*powner = NULL;
-		}
+	for (n = 0; n < hdev->maxchild; n++) {
+		if (hub->port_data[n].port_owner == owner)
+			hub->port_data[n].port_owner = NULL;
 	}
+
 }
 
 /* The caller must hold udev's lock */
@@ -1492,7 +1495,7 @@ bool usb_device_is_owned(struct usb_device *udev)
 	if (udev->state == USB_STATE_NOTATTACHED || !udev->parent)
 		return false;
 	hub = hdev_to_hub(udev->parent);
-	return !!hub->port_owners[udev->portnum - 1];
+	return !!hub->port_data[udev->portnum - 1].port_owner;
 }