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| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2017-10-17 07:18:35 +0200 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2017-10-19 13:05:53 +0200 |
| commit | cae1d5b78fb4874086170ad07921bca59ea2e893 (patch) | |
| tree | 81530dfc1b20ce28497e9a0187a0867c2f070c54 /net/can | |
| parent | can: bcm: check for null sk before deferencing it via the call to sock_net (diff) | |
| download | linux-cae1d5b78fb4874086170ad07921bca59ea2e893.tar.xz linux-cae1d5b78fb4874086170ad07921bca59ea2e893.zip | |
can: af_can: do not access proto_tab directly use rcu_access_pointer instead
"proto_tab" is a RCU protected array, when directly accessing the array,
sparse throws these warnings:
CHECK /srv/work/frogger/socketcan/linux/net/can/af_can.c
net/can/af_can.c:115:14: error: incompatible types in comparison expression (different address spaces)
net/can/af_can.c:795:17: error: incompatible types in comparison expression (different address spaces)
net/can/af_can.c:816:9: error: incompatible types in comparison expression (different address spaces)
This patch fixes the problem by using rcu_access_pointer() and
annotating "proto_tab" array as __rcu.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'net/can')
| -rw-r--r-- | net/can/af_can.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/can/af_can.c b/net/can/af_can.c index 88edac0f3e36..eb1ad74b40f4 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -78,7 +78,7 @@ MODULE_PARM_DESC(stats_timer, "enable timer for statistics (default:on)"); static struct kmem_cache *rcv_cache __read_mostly; /* table of registered CAN protocols */ -static const struct can_proto *proto_tab[CAN_NPROTO] __read_mostly; +static const struct can_proto __rcu *proto_tab[CAN_NPROTO] __read_mostly; static DEFINE_MUTEX(proto_tab_lock); static atomic_t skbcounter = ATOMIC_INIT(0); @@ -788,7 +788,7 @@ int can_proto_register(const struct can_proto *cp) mutex_lock(&proto_tab_lock); - if (proto_tab[proto]) { + if (rcu_access_pointer(proto_tab[proto])) { pr_err("can: protocol %d already registered\n", proto); err = -EBUSY; } else @@ -812,7 +812,7 @@ void can_proto_unregister(const struct can_proto *cp) int proto = cp->protocol; mutex_lock(&proto_tab_lock); - BUG_ON(proto_tab[proto] != cp); + BUG_ON(rcu_access_pointer(proto_tab[proto]) != cp); RCU_INIT_POINTER(proto_tab[proto], NULL); mutex_unlock(&proto_tab_lock); |