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authorHuajun Li <huajun.li.lee@gmail.com>2012-03-12 21:00:19 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-03-13 14:24:07 -0700
commit8816230e13d0c3c6ba51916d20e6d204646abf03 (patch)
tree3b9c29e8e07490fa6914fbe75c7dcfe95b84c14c /drivers/usb/core/hub.c
parent90221170bfe101de59a05910b4cb6d6e5de046b1 (diff)
USB: dynamically allocate usb_device children pointers instead of using a fix array
Non-hub device has no child, and even a real USB hub has ports far less than USB_MAXCHILDREN, so there is no need using a fix array for child devices, just allocate it dynamically according real port number. Signed-off-by: Huajun Li <huajun.li.lee@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core/hub.c')
-rw-r--r--drivers/usb/core/hub.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 72c51cdce90..28664eb7f55 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1047,8 +1047,10 @@ static int hub_configure(struct usb_hub *hub,
dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
(hdev->maxchild == 1) ? "" : "s");
+ hdev->children = kzalloc(hdev->maxchild *
+ sizeof(struct usb_device *), GFP_KERNEL);
hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL);
- if (!hub->port_owners) {
+ if (!hdev->children || !hub->port_owners) {
ret = -ENOMEM;
goto fail;
}
@@ -1279,7 +1281,8 @@ static unsigned highspeed_hubs;
static void hub_disconnect(struct usb_interface *intf)
{
- struct usb_hub *hub = usb_get_intfdata (intf);
+ struct usb_hub *hub = usb_get_intfdata(intf);
+ struct usb_device *hdev = interface_to_usbdev(intf);
/* Take the hub off the event list and don't let it be added again */
spin_lock_irq(&hub_event_lock);
@@ -1301,6 +1304,7 @@ static void hub_disconnect(struct usb_interface *intf)
highspeed_hubs--;
usb_free_urb(hub->urb);
+ kfree(hdev->children);
kfree(hub->port_owners);
kfree(hub->descriptor);
kfree(hub->status);
@@ -1676,7 +1680,7 @@ void usb_disconnect(struct usb_device **pdev)
usb_lock_device(udev);
/* Free up all the children before we remove this device */
- for (i = 0; i < USB_MAXCHILDREN; i++) {
+ for (i = 0; i < udev->maxchild; i++) {
if (udev->children[i])
usb_disconnect(&udev->children[i]);
}