[PATCH] of: of_reserved_mem: match memblock_free with memblock_reserve

[권오훈]

When __reserved_mem_init_node called from fdt_init_reserved_mem fails,
we try to undo __reserved_mem_alloc_size to prevent memory leak.
'commit d0b8ed47e83a ("of: reserved_mem: fix reserve memory leak")'

Meanwhile, __reserved_mem_alloc_size calls
early_init_dt_alloc_reserved_memory_arch to allocate memory,
which calls
1) memblock_remove when rmem is declared nomap,
2) memblock_reserve, otherwise.

static int __init early_init_dt_alloc_reserved_memory_arch(
...
	if (nomap)
		return memblock_remove(base, size);

	return memblock_reserve(base, size);
}

Therefore the proper undo-logic should be as follows:
1) memblock_add when rmem is declared nomap,
2) memblock_free, otherwise.

Match the undo functions for readability.

Signed-off-by: Ohhoon Kwon <ohoono.kwon@xxxxxxxxxxx>
---
 drivers/of/of_reserved_mem.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 15e2417974d6..2279e1b55d1d 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -273,9 +273,10 @@ void __init fdt_init_reserved_mem(void)
 			if (err != 0 && err != -ENOENT) {
 				pr_info("node %s compatible matching fail\n",
 					rmem->name);
-				memblock_free(rmem->base, rmem->size);
 				if (nomap)
 					memblock_add(rmem->base, rmem->size);
+				else
+					memblock_free(rmem->base, rmem->size);
 			}
 		}
 	}
-- 
2.17.1