• Ivo van Doorn's avatar
    rt2x00: Fix lock dependency errror · 980dfcb9
    Ivo van Doorn authored
    
    
    This fixes a circular locking dependency in the workqueue handling.
    The interface work task uses the mac80211 function
    ieee80211_iterate_active_interfaces() which grabs the RTNL lock.
    
    However when the interface is brough down, this happens under the RTNL
    lock as well, this causes problems because mac80211 will flush the workqueue
    during the ifdown event. This causes mac80211 to wait until the driver has
    completed all work which can't finish because it is waiting on the RTNL lock.
    
    This is fixed by moving rt2x00 workqueue tasks on a different workqueue,
    this workqueue can be flushed when the ieee80211_hw structure is removed
    by the driver (when the driver is unloaded) which does not happen under the
    RTNL lock.
    Signed-off-by: default avatarIvo van Doorn <IvDoorn@gmail.com>
    Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
    980dfcb9
rt2x00mac.c 15.2 KB