From: Tudor Ambarus <tudor.ambarus@microchip.com>
Date: Fri, 25 Oct 2019 14:28:34 +0000
Subject: mtd: spi-nor: Make sure nor->spimem and nor->controller_ops are
 mutually exclusive
Git-commit: ac82229d4e0a060194f66f44cb65fb98f3524e41
Patch-mainline: v5.5-rc1
References: jsc#SLE-14214 jsc#SLE-16606

Expand the spi_nor_check() to make sure that nor->spimem and
nor->controller_ops are mutually exclusive.

Fixes: b35b9a10362d ("mtd: spi-nor: Move m25p80 code in spi-nor.c")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 824649eecd59..f5d24ccf5108 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -2878,6 +2878,7 @@ static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
 static int spi_nor_check(struct spi_nor *nor)
 {
 	if (!nor->dev ||
+	    (!nor->spimem && !nor->controller_ops) ||
 	    (!nor->spimem && nor->controller_ops &&
 	    (!nor->controller_ops->read ||
 	     !nor->controller_ops->write ||
@@ -2887,6 +2888,11 @@ static int spi_nor_check(struct spi_nor *nor)
 		return -EINVAL;
 	}
 
+	if (nor->spimem && nor->controller_ops) {
+		dev_err(nor->dev, "nor->spimem and nor->controller_ops are mutually exclusive, please set just one of them.\n");
+		return -EINVAL;
+	}
+
 	return 0;
 }
 
-- 
2.28.0