[PATCH 1/2] MTD: check for valid pdata inside plat_nand

[John Crispin]

If plat_nand loads and the platform_data is not properly set it will segfault.

Signed-off-by: John Crispin <blogic at openwrt.org>
Acked-by: Artem Bityutskiy <artem.bityutskiy at linux.intel.com>
Cc: linux-mtd at lists.infradead.org
---
I am seeing this when plat_nand is referenced inside my DT file but
CONFIG_MTD_NAND_XWAY is not selected, resulting in platform_data not being
populated with valid data.
---
 drivers/mtd/nand/plat_nand.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/nand/plat_nand.c b/drivers/mtd/nand/plat_nand.c
index 1bcb520..a47ee68 100644
--- a/drivers/mtd/nand/plat_nand.c
+++ b/drivers/mtd/nand/plat_nand.c
@@ -37,6 +37,11 @@ static int __devinit plat_nand_probe(struct platform_device *pdev)
 	const char **part_types;
 	int err = 0;
 
+	if (!pdata) {
+		dev_err(&pdev->dev, "platform_nand_data is missing\n");
+		return -EINVAL;
+	}
+
 	if (pdata->chip.nr_chips < 1) {
 		dev_err(&pdev->dev, "invalid number of chips specified\n");
 		return -EINVAL;
-- 
1.7.9.1