[POWERPC] Check for the root node in of_detach_node()
It's not sensible to call of_detach_node() on the root node,
but we should check for it just to be safe.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 6f32bebd..cc9632c 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -1432,6 +1432,8 @@
write_lock(&devtree_lock);
parent = np->parent;
+ if (!parent)
+ goto out_unlock;
if (allnodes == np)
allnodes = np->allnext;
@@ -1455,6 +1457,7 @@
prevsib->sibling = np->sibling;
}
+out_unlock:
write_unlock(&devtree_lock);
}