[U-Boot] [PATCH] common: env_nand: Ensure that we have nand_info[0] prior to use

[Tom Rini]

Now that nand_info[] is an array of pointers we need to ensure that it's
been populated prior to use.  We may for example have ENV in NAND set in
configurations that run on boards with and without NAND (where default
env is fine enough, such as omap3_beagle and beagleboard (NAND) vs
beagle xM (no NAND)).

Fixes: b616d9b0a708 ("nand: Embed mtd_info in struct nand_chip")
Cc: Scott Wood <oss at buserror.net>
Signed-off-by: Tom Rini <trini at konsulko.com>
---
 common/env_nand.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/common/env_nand.c b/common/env_nand.c
index fc99a5e3fc0d..9a2dec187690 100644
--- a/common/env_nand.c
+++ b/common/env_nand.c
@@ -132,6 +132,9 @@ static int writeenv(size_t offset, u_char *buf)
 	size_t blocksize, len;
 	u_char *char_ptr;
 
+	if (!nand_info[0])
+		return 1;
+
 	blocksize = nand_info[0]->erasesize;
 	len = min(blocksize, (size_t)CONFIG_ENV_SIZE);
 
@@ -244,10 +247,12 @@ static int readenv(size_t offset, u_char *buf)
 {
 	size_t end = offset + CONFIG_ENV_RANGE;
 	size_t amount_loaded = 0;
-	size_t blocksize, len;
+	size_t blocksize = 0, len;
 	u_char *char_ptr;
 
-	blocksize = nand_info[0]->erasesize;
+	if (nand_info[0])
+		blocksize = nand_info[0]->erasesize;
+
 	if (!blocksize)
 		return 1;
 
-- 
1.9.1