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usb: hub: keep hub->dev reference all the time when struct usb_hub lives

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This is just a small optimization of the fix from the commit c605f3cdff
("usb: hub: take hub->hdev reference when processing from eventlist).

We do not need to take the reference for each event. Instead we could get it
when struct usb_hub is allocated and put it when it is released. By other words,
we could handle it the same way as the reference for hub->intfdev.

The motivation is that it will make the life easier when switching from khubd
kthread to a workqueue.

Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Petr Mladek <pmladek@suse.cz>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Petr Mladek 2014-09-19 17:32:19 +02:00 committed by Greg Kroah-Hartman
parent 3512e7bfea
commit 5d14f32383
1 changed files with 3 additions and 3 deletions
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6
drivers/usb/core/hub.c
View file

@ -1635,6 +1635,7 @@ static void hub_release(struct kref *kref)
{
struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
usb_put_dev(hub->hdev);
usb_put_intf(to_usb_interface(hub->intfdev));
kfree(hub);
}
@ -1800,6 +1801,7 @@ descriptor_error:
INIT_DELAYED_WORK(&hub->leds, led_work);
INIT_DELAYED_WORK(&hub->init_work, NULL);
usb_get_intf(intf);
usb_get_dev(hdev);
usb_set_intfdata (intf, hub);
intf->needs_remote_wakeup = 1;
@ -5026,10 +5028,9 @@ static void hub_events(void)
hub = list_entry(tmp, struct usb_hub, event_list);
kref_get(&hub->kref);
hdev = hub->hdev;
usb_get_dev(hdev);
spin_unlock_irq(&hub_event_lock);
hdev = hub->hdev;
hub_dev = hub->intfdev;
intf = to_usb_interface(hub_dev);
dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
@ -5142,7 +5143,6 @@ static void hub_events(void)
usb_autopm_put_interface(intf);
loop_disconnected:
usb_unlock_device(hdev);
usb_put_dev(hdev);
kref_put(&hub->kref, hub_release);
} /* end while (1) */