1 files changed, 25 insertions, 22 deletions

diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index 92367faecbbf..cc87025e8f54 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -701,8 +701,7 @@ ia64_mca_cmc_vector_enable_keventd(struct work_struct *unused)
 /*
  * ia64_mca_wakeup
  *
- *	Send an inter-cpu interrupt to wake-up a particular cpu
- *	and mark that cpu to be out of rendez.
+ *	Send an inter-cpu interrupt to wake-up a particular cpu.
  *
  *  Inputs  :   cpuid
  *  Outputs :   None
@@ -711,14 +710,12 @@ static void
 ia64_mca_wakeup(int cpu)
 {
 	platform_send_ipi(cpu, IA64_MCA_WAKEUP_VECTOR, IA64_IPI_DM_INT, 0);
-	ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
-
 }
 
 /*
  * ia64_mca_wakeup_all
  *
- *	Wakeup all the cpus which have rendez'ed previously.
+ *	Wakeup all the slave cpus which have rendez'ed previously.
  *
  *  Inputs  :   None
  *  Outputs :   None
@@ -741,7 +738,10 @@ ia64_mca_wakeup_all(void)
  *
  *	This is handler used to put slave processors into spinloop
  *	while the monarch processor does the mca handling and later
- *	wake each slave up once the monarch is done.
+ *	wake each slave up once the monarch is done.  The state
+ *	IA64_MCA_RENDEZ_CHECKIN_DONE indicates the cpu is rendez'ed
+ *	in SAL.  The state IA64_MCA_RENDEZ_CHECKIN_NOTDONE indicates
+ *	the cpu has come out of OS rendezvous.
  *
  *  Inputs  :   None
  *  Outputs :   None
@@ -778,6 +778,7 @@ ia64_mca_rendez_int_handler(int rendez_irq, void *arg)
 		       (long)&nd, 0, 0) == NOTIFY_STOP)
 		ia64_mca_spin(__FUNCTION__);
 
+	ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
 	/* Enable all interrupts */
 	local_irq_restore(flags);
 	return IRQ_HANDLED;
@@ -1221,26 +1222,27 @@ ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
 	if (notify_die(DIE_MCA_MONARCH_ENTER, "MCA", regs, (long)&nd, 0, 0)
 			== NOTIFY_STOP)
 		ia64_mca_spin(__FUNCTION__);
+
+	ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA;
 	if (sos->monarch) {
 		ia64_wait_for_slaves(cpu, "MCA");
+
+		/* Wakeup all the processors which are spinning in the
+		 * rendezvous loop.  They will leave SAL, then spin in the OS
+		 * with interrupts disabled until this monarch cpu leaves the
+		 * MCA handler.  That gets control back to the OS so we can
+		 * backtrace the other cpus, backtrace when spinning in SAL
+		 * does not work.
+		 */
+		ia64_mca_wakeup_all();
+		if (notify_die(DIE_MCA_MONARCH_PROCESS, "MCA", regs, (long)&nd, 0, 0)
+				== NOTIFY_STOP)
+			ia64_mca_spin(__FUNCTION__);
 	} else {
-		ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA;
 		while (cpu_isset(cpu, mca_cpu))
 			cpu_relax();	/* spin until monarch wakes us */
-		ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
         }
 
-	/* Wakeup all the processors which are spinning in the rendezvous loop.
-	 * They will leave SAL, then spin in the OS with interrupts disabled
-	 * until this monarch cpu leaves the MCA handler.  That gets control
-	 * back to the OS so we can backtrace the other cpus, backtrace when
-	 * spinning in SAL does not work.
-	 */
-	ia64_mca_wakeup_all();
-	if (notify_die(DIE_MCA_MONARCH_PROCESS, "MCA", regs, (long)&nd, 0, 0)
-			== NOTIFY_STOP)
-		ia64_mca_spin(__FUNCTION__);
-
 	/* Get the MCA error record and log it */
 	ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA);
 
@@ -1274,21 +1276,22 @@ ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
 		/* wake up the next monarch cpu,
 		 * and put this cpu in the rendez loop.
 		 */
-		ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA;
 		for_each_online_cpu(i) {
 			if (cpu_isset(i, mca_cpu)) {
 				monarch_cpu = i;
 				cpu_clear(i, mca_cpu);	/* wake next cpu */
 				while (monarch_cpu != -1)
 					cpu_relax();	/* spin until last cpu leaves */
-				ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
 				set_curr_task(cpu, previous_current);
+				ia64_mc_info.imi_rendez_checkin[cpu]
+						= IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
 				return;
 			}
 		}
 	}
 	set_curr_task(cpu, previous_current);
-	monarch_cpu = -1;
+	ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
+	monarch_cpu = -1;	/* This frees the slaves and previous monarchs */
 }
 
 static DECLARE_WORK(cmc_disable_work, ia64_mca_cmc_vector_disable_keventd);