2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Robin Holt commit 69b3bb65fa97a1e8563518dbbc35cd57beefb2d4 upstream. 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 Signed-off-by: Dean Nelson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- drivers/misc/sgi-xp/xpc_sn2.c | 9 +++++---- drivers/misc/sgi-xp/xpc_uv.c | 2 +- 2 files changed, 6 insertions(+), 5 deletions(-) --- a/drivers/misc/sgi-xp/xpc_sn2.c +++ b/drivers/misc/sgi-xp/xpc_sn2.c @@ -1841,6 +1841,7 @@ xpc_process_msg_chctl_flags_sn2(struct x */ xpc_clear_remote_msgqueue_flags_sn2(ch); + smp_wmb(); /* ensure flags have been cleared before bte_copy */ ch_sn2->w_remote_GP.put = ch_sn2->remote_GP.put; dev_dbg(xpc_chan, "w_remote_GP.put changed to %ld, partid=%d, " @@ -1939,7 +1940,7 @@ xpc_get_deliverable_payload_sn2(struct x break; get = ch_sn2->w_local_GP.get; - rmb(); /* guarantee that .get loads before .put */ + smp_rmb(); /* guarantee that .get loads before .put */ if (get == ch_sn2->w_remote_GP.put) break; @@ -2058,7 +2059,7 @@ xpc_allocate_msg_sn2(struct xpc_channel while (1) { put = ch_sn2->w_local_GP.put; - rmb(); /* guarantee that .put loads before .get */ + smp_rmb(); /* guarantee that .put loads before .get */ if (put - ch_sn2->w_remote_GP.get < ch->local_nentries) { /* There are available message entries. We need to try @@ -2191,7 +2192,7 @@ xpc_send_payload_sn2(struct xpc_channel * The preceding store of msg->flags must occur before the following * load of local_GP->put. */ - mb(); + smp_mb(); /* see if the message is next in line to be sent, if so send it */ @@ -2292,7 +2293,7 @@ xpc_received_payload_sn2(struct xpc_chan * The preceding store of msg->flags must occur before the following * load of local_GP->get. */ - mb(); + smp_mb(); /* * See if this message is next in line to be acknowledged as having --- a/drivers/misc/sgi-xp/xpc_uv.c +++ b/drivers/misc/sgi-xp/xpc_uv.c @@ -1238,7 +1238,7 @@ xpc_send_payload_uv(struct xpc_channel * 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) { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/