From 79952bca8619b62c9b1a118238ca16ab41be7760 Mon Sep 17 00:00:00 2001 From: Fabian Frederick Date: Mon, 6 Oct 2014 20:15:20 +0200 Subject: [PATCH] net: fix rcu access on phonet_routes -Add __rcu annotation on table to fix sparse warnings: net/phonet/pn_dev.c:279:25: warning: incorrect type in assignment (different address spaces) net/phonet/pn_dev.c:279:25: expected struct net_device * net/phonet/pn_dev.c:279:25: got void [noderef] * net/phonet/pn_dev.c:376:17: warning: incorrect type in assignment (different address spaces) net/phonet/pn_dev.c:376:17: expected struct net_device *volatile net/phonet/pn_dev.c:376:17: got struct net_device [noderef] * net/phonet/pn_dev.c:392:17: warning: incorrect type in assignment (different address spaces) net/phonet/pn_dev.c:392:17: expected struct net_device * net/phonet/pn_dev.c:392:17: got void [noderef] * -Access table with rcu_access_pointer (fixes the following sparse errors): net/phonet/pn_dev.c:278:25: error: incompatible types in comparison expression (different address spaces) net/phonet/pn_dev.c:391:17: error: incompatible types in comparison expression (different address spaces) Suggested-by: Eric Dumazet Signed-off-by: Fabian Frederick Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- net/phonet/pn_dev.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/phonet/pn_dev.c b/net/phonet/pn_dev.c index 56a6146ac94b..a58680016472 100644 --- a/net/phonet/pn_dev.c +++ b/net/phonet/pn_dev.c @@ -36,7 +36,7 @@ struct phonet_routes { struct mutex lock; - struct net_device *table[64]; + struct net_device __rcu *table[64]; }; struct phonet_net { @@ -275,7 +275,7 @@ static void phonet_route_autodel(struct net_device *dev) bitmap_zero(deleted, 64); mutex_lock(&pnn->routes.lock); for (i = 0; i < 64; i++) - if (dev == pnn->routes.table[i]) { + if (rcu_access_pointer(pnn->routes.table[i]) == dev) { RCU_INIT_POINTER(pnn->routes.table[i], NULL); set_bit(i, deleted); } @@ -388,7 +388,7 @@ int phonet_route_del(struct net_device *dev, u8 daddr) daddr = daddr >> 2; mutex_lock(&routes->lock); - if (dev == routes->table[daddr]) + if (rcu_access_pointer(routes->table[daddr]) == dev) RCU_INIT_POINTER(routes->table[daddr], NULL); else dev = NULL;