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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>
This commit is contained in:
Huajun Li 2012-03-12 21:00:19 +08:00 committed by Greg Kroah-Hartman
parent 90221170bf
commit 8816230e13
2 changed files with 8 additions and 4 deletions
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10
drivers/usb/core/hub.c
View File

@ -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]);
}

2
include/linux/usb.h
View File

@ -501,7 +501,7 @@ struct usb_device {
#endif
int maxchild;
struct usb_device *children[USB_MAXCHILDREN];
struct usb_device **children;
u32 quirks;
atomic_t urbnum;