1 files changed, 6 insertions, 3 deletions

diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 8619f2a3f1f6..466e2183e86c 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -1144,9 +1144,12 @@ struct mpic * __init mpic_alloc(struct device_node *node,
         mpic->num_cpus = ((greg_feature & MPIC_GREG_FEATURE_LAST_CPU_MASK)
                           >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
         if (isu_size == 0)
-                mpic->num_sources =
-                        ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
-                         >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
+                if (flags & MPIC_BROKEN_FRR_NIRQS)
+                        mpic->num_sources = mpic->irq_count;
+                else
+                        mpic->num_sources =
+                                ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
+                                 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
 
         /* Map the per-CPU registers */
         for (i = 0; i < mpic->num_cpus; i++) {