Messages in this thread Patch in this message | | | Date | Thu, 15 Jan 2009 11:49:49 -0600 | From | holt@sgi ... | Subject | [patch 1/3] sgi-xpc: ensure flags are updated before bte_copy |
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From: Robin Holt <holt@sgi.com>
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>
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drivers/misc/sgi-xp/xpc_sn2.c | 1 + 1 file changed, 1 insertion(+) Index: xpc-fixes-20090115/drivers/misc/sgi-xp/xpc_sn2.c =================================================================== --- xpc-fixes-20090115.orig/drivers/misc/sgi-xp/xpc_sn2.c 2009-01-15 10:21:53.700266968 -0600 +++ xpc-fixes-20090115/drivers/misc/sgi-xp/xpc_sn2.c 2009-01-15 10:51:10.165613058 -0600 @@ -1836,6 +1836,7 @@ xpc_process_msg_chctl_flags_sn2(struct x */ xpc_clear_remote_msgqueue_flags_sn2(ch); + 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, "
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