1 files changed, 10 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/xics/icp-opal.c b/arch/powerpc/sysdev/xics/icp-opal.c
index f9670eabfcfa..b53f80f0b4d8 100644
--- a/arch/powerpc/sysdev/xics/icp-opal.c
+++ b/arch/powerpc/sysdev/xics/icp-opal.c
@@ -91,6 +91,16 @@ static unsigned int icp_opal_get_irq(void)
 
 static void icp_opal_set_cpu_priority(unsigned char cppr)
 {
+        /*
+         * Here be dragons. The caller has asked to allow only IPI's and not
+         * external interrupts. But OPAL XIVE doesn't support that. So instead
+         * of allowing no interrupts allow all. That's still not right, but
+         * currently the only caller who does this is xics_migrate_irqs_away()
+         * and it works in that case.
+         */
+        if (cppr >= DEFAULT_PRIORITY)
+                cppr = LOWEST_PRIORITY;
+
         xics_set_base_cppr(cppr);
         opal_int_set_cppr(cppr);
         iosync();