sgi-xpc: ensure flags are updated before bte_copy

The clearing of the msg->flags needs a barrier between it and the notify
of the channel threads that the messages are cleaned and ready for use.

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Dean Nelson <dcn@sgi.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/misc/sgi-xp/xpc_uv.c b/drivers/misc/sgi-xp/xpc_uv.c
index 91a55b1b1037..f17f7d40ea2c 100644
--- a/drivers/misc/sgi-xp/xpc_uv.c
+++ b/drivers/misc/sgi-xp/xpc_uv.c
@@ -1423,7 +1423,7 @@ xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
                 atomic_inc(&ch->n_to_notify);
 
                 msg_slot->key = key;
-                wmb(); /* a non-NULL func must hit memory after the key */
+                smp_wmb(); /* a non-NULL func must hit memory after the key */
                 msg_slot->func = func;
 
                 if (ch->flags & XPC_C_DISCONNECTING) {