This is just a small optimization of the fix from the commit c605f3cdff53a743f6
("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 <[email protected]> Signed-off-by: Petr Mladek <[email protected]> --- drivers/usb/core/hub.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index d481c99a20d7..8f35e5158daf 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1634,6 +1634,7 @@ 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); } @@ -1799,6 +1800,7 @@ 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; @@ -5024,10 +5026,9 @@ 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", @@ -5140,7 +5141,6 @@ 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) */ -- 1.8.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
