From: Miquel Raynal miquel.raynal@bootlin.com
stable inclusion from linux-4.19.207 commit 05e4fdd51a934d4bf51b368e5c00dd35f744637e
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[ 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@boo... Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- 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 c059ab74ed886..a4a75fa795249 100644 --- a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt +++ b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt @@ -122,7 +122,7 @@ 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