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usbmon: fix tiny race exposed by the fastboot patches

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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 <arjan@linux.intel.com>
Acked-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Arjan van de Ven 2008-09-22 15:00:10 -07:00 committed by Greg Kroah-Hartman
parent 8520f38099
commit bb4e3b5ac8
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/mon/mon_main.c
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@ -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;