sgi-xpc: implement opencomplete messaging

sgi-xpc has a window of failure where an open message can be sent and a
subsequent data message can get lost.  We have added a new message
(opencomplete) which closes that window.

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

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/misc/sgi-xp/xpc_sn2.c b/drivers/misc/sgi-xp/xpc_sn2.c
index 43ad2968daf5..09bc1989f216 100644
--- a/drivers/misc/sgi-xp/xpc_sn2.c
+++ b/drivers/misc/sgi-xp/xpc_sn2.c
@@ -431,6 +431,13 @@ xpc_send_chctl_openreply_sn2(struct xpc_channel *ch, unsigned long *irq_flags)
 }
 
 static void
+xpc_send_chctl_opencomplete_sn2(struct xpc_channel *ch,
+                                unsigned long *irq_flags)
+{
+        XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_OPENCOMPLETE, irq_flags);
+}
+
+static void
 xpc_send_chctl_msgrequest_sn2(struct xpc_channel *ch)
 {
         XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_MSGREQUEST, NULL);
@@ -2380,6 +2387,7 @@ xpc_init_sn2(void)
         xpc_send_chctl_closereply = xpc_send_chctl_closereply_sn2;
         xpc_send_chctl_openrequest = xpc_send_chctl_openrequest_sn2;
         xpc_send_chctl_openreply = xpc_send_chctl_openreply_sn2;
+        xpc_send_chctl_opencomplete = xpc_send_chctl_opencomplete_sn2;
 
         xpc_save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_sn2;