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>

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index ec6c97d..0c17d5a 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/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;
 }