From: Stefan Agner <stefan.agner@toradex.com>
Date: Mon, 6 Aug 2018 07:19:18 +0000 (+0200)
Subject: board: toradex: common: fail gracefully on missing NAND chip
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=bc53fb19fef1afbd7b328ea72de5be313016f585;p=u-boot.git

board: toradex: common: fail gracefully on missing NAND chip

If the NAND chip is missing get_nand_dev_by_index() returns NULL. Fail
gracefully in this case.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
---

diff --git a/board/toradex/common/tdx-cfg-block.c b/board/toradex/common/tdx-cfg-block.c
index 57edb6c5c9..d4f5b1803a 100644
--- a/board/toradex/common/tdx-cfg-block.c
+++ b/board/toradex/common/tdx-cfg-block.c
@@ -156,10 +156,13 @@ out:
 static int read_tdx_cfg_block_from_nand(unsigned char *config_block)
 {
 	size_t size = TDX_CFG_BLOCK_MAX_SIZE;
+	struct mtd_info *mtd = get_nand_dev_by_index(0);
+
+	if (!mtd)
+		return -ENODEV;
 
 	/* Read production parameter config block from NAND page */
-	return nand_read_skip_bad(get_nand_dev_by_index(0),
-				  CONFIG_TDX_CFG_BLOCK_OFFSET,
+	return nand_read_skip_bad(mtd, CONFIG_TDX_CFG_BLOCK_OFFSET,
 				  &size, NULL, TDX_CFG_BLOCK_MAX_SIZE,
 				  config_block);
 }