1 files changed, 27 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
index cca7c8fafc1c..8c066d6a8e4b 100644
--- a/arch/powerpc/kernel/crash.c
+++ b/arch/powerpc/kernel/crash.c
@@ -162,6 +162,32 @@ static void crash_kexec_prepare_cpus(int cpu)
         /* Leave the IPI callback set */
 }
 
+/* wait for all the CPUs to hit real mode but timeout if they don't come in */
+static void crash_kexec_wait_realmode(int cpu)
+{
+        unsigned int msecs;
+        int i;
+
+        msecs = 10000;
+        for (i=0; i < NR_CPUS && msecs > 0; i++) {
+                if (i == cpu)
+                        continue;
+
+                while (paca[i].kexec_state < KEXEC_STATE_REAL_MODE) {
+                        barrier();
+                        if (!cpu_possible(i)) {
+                                break;
+                        }
+                        if (!cpu_online(i)) {
+                                break;
+                        }
+                        msecs--;
+                        mdelay(1);
+                }
+        }
+        mb();
+}
+
 /*
  * This function will be called by secondary cpus or by kexec cpu
  * if soft-reset is activated to stop some CPUs.
@@ -419,6 +445,7 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
         crash_kexec_prepare_cpus(crashing_cpu);
         cpu_set(crashing_cpu, cpus_in_crash);
         crash_kexec_stop_spus();
+        crash_kexec_wait_realmode(crashing_cpu);
         if (ppc_md.kexec_cpu_down)
                 ppc_md.kexec_cpu_down(1, 0);
 }