df_02_bus_rescan_devcies_fix.patch

 bus_rescan_devices() eventually calls device_attach() and thus
requires write locking the corresponding bus.  The original code just
called bus_for_each_dev() which only read locks the bus.  This patch
separates __bus_for_each_dev() and __bus_for_each_drv(), which don't
do locking themselves, out from the original functions and call them
with read lock in the original functions and with write lock in
bus_rescan_devices().
Signed-off-by: Tejun Heo <tj@home-tj.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>