From bb4e3b5ac81a9601775e62649038934acafa78e2 Mon Sep 17 00:00:00 2001 From: Arjan van de Ven Date: Mon, 22 Sep 2008 15:00:10 -0700 Subject: [PATCH] usbmon: fix tiny race exposed by the fastboot patches usbmon registers the notifier chain, takes the bus lock and then goes to scan the existing devices for hooking up. Unfortunately, if usb_mon gets initialized while USB bus discovery is going on, it's possible that usbmon gets a notifier on one cpu (which runs without USB locks), and the scan is going on and also finds the new bus, resulting in a double sysfs registration, which then produces a WARNING. Pete Zaitcev did the bug diagnostics on this one Signed-off-by: Arjan van de Ven Acked-by: Pete Zaitcev Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- drivers/usb/mon/mon_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/mon/mon_main.c b/drivers/usb/mon/mon_main.c index 442d8076b20..5e0ab4201c0 100644 --- a/drivers/usb/mon/mon_main.c +++ b/drivers/usb/mon/mon_main.c @@ -361,12 +361,12 @@ static int __init mon_init(void) } // MOD_INC_USE_COUNT(which_module?); - usb_register_notify(&mon_nb); mutex_lock(&usb_bus_list_lock); list_for_each_entry (ubus, &usb_bus_list, bus_list) { mon_bus_init(ubus); } + usb_register_notify(&mon_nb); mutex_unlock(&usb_bus_list_lock); return 0; -- 2.41.1