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sgi-xpc: ensure flags are updated before bte_copy

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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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2
drivers/misc/sgi-xp/xpc_uv.c
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@@ -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) {