interrupts: add_opal_interrupts avoid NULL dereference on P10 mambo

On P10, get_ics_phandle() calls xive2_get_phandle() directly. This
results in a NULL dereference on mambo when xive2 is not set up.

This was caught with the virtual memory boot patch on P10 mambo.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/hw/xive2.c b/hw/xive2.c
index 810ab91..0254175 100644
--- a/hw/xive2.c
+++ b/hw/xive2.c
@@ -1977,6 +1977,9 @@ static void xive_create_mmio_dt_node(struct xive *x)
 
 uint32_t xive2_get_phandle(void)
 {
+	if (!xive_dt_node)
+		return 0;
+
 	return xive_dt_node->phandle;
 }