1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/misc/sgi-xp/xp.h b/drivers/misc/sgi-xp/xp.h
index c862cd4583cc..b8069eec18cb 100644
--- a/drivers/misc/sgi-xp/xp.h
+++ b/drivers/misc/sgi-xp/xp.h
@@ -309,6 +309,9 @@ static inline enum xp_retval
 xpc_send(short partid, int ch_number, u32 flags, void *payload,
          u16 payload_size)
 {
+        if (!xpc_interface.send)
+                return xpNotLoaded;
+
         return xpc_interface.send(partid, ch_number, flags, payload,
                                   payload_size);
 }
@@ -317,6 +320,9 @@ static inline enum xp_retval
 xpc_send_notify(short partid, int ch_number, u32 flags, void *payload,
                 u16 payload_size, xpc_notify_func func, void *key)
 {
+        if (!xpc_interface.send_notify)
+                return xpNotLoaded;
+
         return xpc_interface.send_notify(partid, ch_number, flags, payload,
                                          payload_size, func, key);
 }
@@ -324,12 +330,16 @@ xpc_send_notify(short partid, int ch_number, u32 flags, void *payload,
 static inline void
 xpc_received(short partid, int ch_number, void *payload)
 {
-        return xpc_interface.received(partid, ch_number, payload);
+        if (xpc_interface.received)
+                xpc_interface.received(partid, ch_number, payload);
 }
 
 static inline enum xp_retval
 xpc_partid_to_nasids(short partid, void *nasids)
 {
+        if (!xpc_interface.partid_to_nasids)
+                return xpNotLoaded;
+
         return xpc_interface.partid_to_nasids(partid, nasids);
 }