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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>
This commit is contained in:
Robin Holt 2009-01-29 14:25:06 -08:00 committed by Linus Torvalds
parent de33c8db59
commit 69b3bb65fa
2 changed files with 6 additions and 5 deletions
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9
drivers/misc/sgi-xp/xpc_sn2.c
View File

@ -1836,6 +1836,7 @@ xpc_process_msg_chctl_flags_sn2(struct xpc_partition *part, int ch_number)
*/
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, "
@ -1934,7 +1935,7 @@ xpc_get_deliverable_payload_sn2(struct xpc_channel *ch)
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;
@ -2053,7 +2054,7 @@ xpc_allocate_msg_sn2(struct xpc_channel *ch, u32 flags,
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
@ -2186,7 +2187,7 @@ xpc_send_payload_sn2(struct xpc_channel *ch, u32 flags, void *payload,
* 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 */
@ -2287,7 +2288,7 @@ xpc_received_payload_sn2(struct xpc_channel *ch, void *payload)
* 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

2
drivers/misc/sgi-xp/xpc_uv.c
View File

@ -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) {