Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        "Ryan J. Barnett" <ryan.barnett@collins.com>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Rob Herring <robh@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.4 127/133] dt-bindings: mtd: gpmc: Fix the ECC bytes vs. OOB bytes equation
Date:   Mon, 20 Sep 2021 18:43:25 +0200
Message-Id: <20210920163916.780183161@linuxfoundation.org>
In-Reply-To: <20210920163912.603434365@linuxfoundation.org>
References: <20210920163912.603434365@linuxfoundation.org>
User-Agent: quilt/0.66
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Miquel Raynal <miquel.raynal@bootlin.com>

[ Upstream commit 778cb8e39f6ec252be50fc3850d66f3dcbd5dd5a ]

"PAGESIZE / 512" is the number of ECC chunks.
"ECC_BYTES" is the number of bytes needed to store a single ECC code.
"2" is the space reserved by the bad block marker.

"2 + (PAGESIZE / 512) * ECC_BYTES" should of course be lower or equal
than the total number of OOB bytes, otherwise it won't fit.

Fix the equation by substituting s/>=/<=/.

Suggested-by: Ryan J. Barnett <ryan.barnett@collins.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/linux-mtd/20210610143945.3504781-1-miquel.raynal@bootlin.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 Documentation/devicetree/bindings/mtd/gpmc-nand.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
index fb733c4e1c11..3a58fdf0c566 100644
--- a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
@@ -112,7 +112,7 @@ on various other factors also like;
 	so the device should have enough free bytes available its OOB/Spare
 	area to accommodate ECC for entire page. In general following expression
 	helps in determining if given device can accommodate ECC syndrome:
-	"2 + (PAGESIZE / 512) * ECC_BYTES" >= OOBSIZE"
+	"2 + (PAGESIZE / 512) * ECC_BYTES" <= OOBSIZE"
 	where
 		OOBSIZE		number of bytes in OOB/spare area
 		PAGESIZE	number of bytes in main-area of device page
-- 
2.30.2