linux-kernel - [PATCH] mtd: rawnand: denali: error out if platform has no associated data

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Date:   Mon,  9 Dec 2019 14:15:23 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-mtd@...ts.infradead.org
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mtd: rawnand: denali: error out if platform has no associated data

From: Masahiro Yamada <yamada.masahiro@...ionext.com>

denali->ecc_caps is a mandatory parameter. If it were left unset,
nand_ecc_choose_conf() would end up with NULL pointer access.

So, every compatible must be associated with proper denali_dt_data.
If of_device_get_match_data() returns NULL, let it fail immediately.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 drivers/mtd/nand/raw/denali_dt.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/raw/denali_dt.c b/drivers/mtd/nand/raw/denali_dt.c
index 8b779a899dcf..276187939689 100644
--- a/drivers/mtd/nand/raw/denali_dt.c
+++ b/drivers/mtd/nand/raw/denali_dt.c
@@ -118,11 +118,12 @@ static int denali_dt_probe(struct platform_device *pdev)
 	denali = &dt->controller;
 
 	data = of_device_get_match_data(dev);
-	if (data) {
-		denali->revision = data->revision;
-		denali->caps = data->caps;
-		denali->ecc_caps = data->ecc_caps;
-	}
+	if (WARN_ON(!data))
+		return -EINVAL;
+
+	denali->revision = data->revision;
+	denali->caps = data->caps;
+	denali->ecc_caps = data->ecc_caps;
 
 	denali->dev = dev;
 	denali->irq = platform_get_irq(pdev, 0);
-- 
2.17.1