[U-Boot] [PATCH v2] fdt: Fixup only valid memory banks

[Thierry Reding]

From: Thierry Reding <treding at nvidia.com>

Memory banks with address 0 and size 0 are empty and should not be
passed to the OS via device tree.

Acked-by: Stephen Warren <swarren at nvidia.com>
Signed-off-by: Thierry Reding <treding at nvidia.com>
---
Changes in v2:
- check whether or not any banks need to be fixed up after filtering out
  invalid ones (Stephen Warren)
- use braces around multiple-line body of for loop, even if not strictly
  necessary (Stephen Warren)
---
 common/fdt_support.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/common/fdt_support.c b/common/fdt_support.c
index 17623a1728f6..da0c12e9c1bc 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -418,7 +418,7 @@ static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size,
 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
 {
 	int err, nodeoffset;
-	int len;
+	int len, i;
 	u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
 
 	if (banks > MEMORY_BANKS_MAX) {
@@ -447,6 +447,13 @@ int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
 		return err;
 	}
 
+	for (i = 0; i < banks; i++) {
+		if (start[i] == 0 && size[i] == 0)
+			break;
+	}
+
+	banks = i;
+
 	if (!banks)
 		return 0;
 
-- 
2.15.1