[PATCH] ppc64: unflatten_device_tree() should check if lmb_alloc() fails

unflatten_device_tree() doesn't check if lmb_alloc() succeeds or not, it
should. All it can do is panic, but at least there's an error message
(assuming you have some sort of console at that point).

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>

 arch/ppc64/kernel/prom.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/arch/ppc64/kernel/prom.c b/arch/ppc64/kernel/prom.c
index 04b852d446a3..b21848826791 100644
--- a/arch/ppc64/kernel/prom.c
+++ b/arch/ppc64/kernel/prom.c
@@ -950,8 +950,13 @@ void __init unflatten_device_tree(void)
         DBG("  size is %lx, allocating...\n", size);
 
         /* Allocate memory for the expanded device tree */
-        mem = (unsigned long)abs_to_virt(lmb_alloc(size + 4,
-                                                   __alignof__(struct device_node)));
+        mem = lmb_alloc(size + 4, __alignof__(struct device_node));
+        if (!mem) {
+                DBG("Couldn't allocate memory with lmb_alloc()!\n");
+                panic("Couldn't allocate memory with lmb_alloc()!\n");
+        }
+        mem = (unsigned long)abs_to_virt(mem);
+
         ((u32 *)mem)[size / 4] = 0xdeadbeef;
 
         DBG("  unflattening...\n", mem);