powerpc/kernel: Fix unbalanced refcount on RTAS device node

The RTAS device-tree node's refcount has been increased by one in
the function call of_find_node_by_name(), but it's missed to be
decreased by one in the error path. It leads to unbalanced refcount
on RTAS device-tree node.

This fixes above issue by decreasing RTAS device-tree node's refcount
in error path.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index ba5a4cc..b8a4987 100644 (file)
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -1158,6 +1158,7 @@ void __init rtas_initialize(void)
        no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base);
        no_size = of_property_read_u32(rtas.dev, "rtas-size", &size);
        if (no_base || no_size) {
+               of_node_put(rtas.dev);
                rtas.dev = NULL;
                return;
        }