net: Revert "ipv4: get rid of ip_ra_lock"
This reverts commit ba3f571d. The commit was made after 1215e51e "ipv4: fix a deadlock in ip_ra_control", and killed ip_ra_lock, which became useless after rtnl_lock() made used to destroy every raw ipv4 socket. This scales very bad, and next patch in series reverts 1215e51e. ip_ra_lock will be used again. Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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