Messages in this thread Patch in this message | | | From | Fabian Frederick <> | Subject | [RFC 1/1] net: fix rcu access on phonet_routes | Date | Sat, 4 Oct 2014 11:57:56 +0200 |
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-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 *<noident> net/phonet/pn_dev.c:279:25: got void [noderef] <asn:4>*<noident> 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 <noident> net/phonet/pn_dev.c:376:17: got struct net_device [noderef] <asn:4>*<noident> 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 *<noident> net/phonet/pn_dev.c:392:17: got void [noderef] <asn:4>*<noident>
-Access table with rcu_dereference (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)
Signed-off-by: Fabian Frederick <fabf@skynet.be> --- 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 56a6146..5c9c0b2f1 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_dereference(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_dereference(routes->table[daddr]) == dev) RCU_INIT_POINTER(routes->table[daddr], NULL); else dev = NULL; -- 1.9.3
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