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@xxxxxxxxx>
---
drivers/usb/core/hub.c | 10 +++++++---
include/linux/usb.h | 2 +-
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 72c51cd..28664eb 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]);
}
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 0c51663..73b68d1 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -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;
--
1.7.4.1
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