can: gw: synchronize rcu operations before removing gw job entry

can: gw: synchronize rcu operations before removing gw job entry

can_can_gw_rcv() is called under RCU protection, so after calling
can_rx_unregister(), we have to call synchronize_rcu in order to wait
for any RCU read-side critical sections to finish before removing the
kmem_cache entry with the referenced gw job entry.

Link: https://lore.kernel.org/r/[email protected]
Fixes: c1aabdf379bc ("can-gw: add netlink based CAN routing")
Cc: linux-stable <[email protected]>
Signed-off-by: Oliver Hartkopp <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>