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-rw-r--r--arch/powerpc/sysdev/xics/icp-opal.c10
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();