linux-kernel - [PATCH] mtd: rawnand: Fix probe failure due to of_get_nand_secure

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Message-Id: <20210727062813.32619-1-manivannan.sadhasivam@linaro.org>
Date:   Tue, 27 Jul 2021 11:58:13 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     miquel.raynal@...tlin.com
Cc:     richard@....at, vigneshr@...com, boris.brezillon@...labora.com,
        tudor.ambarus@...rochip.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, dan.carpenter@...cle.com,
        martin@...ser.cx,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH] mtd: rawnand: Fix probe failure due to of_get_nand_secure_regions()

Due to 14f97f0b8e2b, the rawnand platforms without "secure-regions"
property defined in DT fails to probe. The issue is,
of_get_nand_secure_regions() errors out if
of_property_count_elems_of_size() returns a negative error code.

If the "secure-regions" property is not present in DT, then also we'll
get -EINVAL from of_property_count_elems_of_size() but it should not
be treated as an error for platforms not declaring "secure-regions"
in DT.

So fix this behaviour by checking for the existence of that property in
DT and return 0 if it is not present.

Fixes: 14f97f0b8e2b ("mtd: rawnand: Add a check in of_get_nand_secure_regions()")
Reported-by: Martin Kaiser <martin@...ser.cx>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/mtd/nand/raw/nand_base.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index cbba46432e39..3d6c6e880520 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -5228,8 +5228,14 @@ static bool of_get_nand_on_flash_bbt(struct device_node *np)
 static int of_get_nand_secure_regions(struct nand_chip *chip)
 {
 	struct device_node *dn = nand_get_flash_node(chip);
+	struct property *prop;
 	int nr_elem, i, j;
 
+	/* Only proceed if the "secure-regions" property is present in DT */
+	prop = of_find_property(dn, "secure-regions", NULL);
+	if (!prop)
+		return 0;
+
 	nr_elem = of_property_count_elems_of_size(dn, "secure-regions", sizeof(u64));
 	if (nr_elem <= 0)
 		return nr_elem;
-- 
2.25.1