linux-kernel - [PATCH v2] mtd: spi-nor: Fix S3AN addressing calculation

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Date:   Wed, 18 Jan 2017 17:40:16 +0100
From:   Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:     Marek Vasut <marek.vasut@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Brian Norris <computersforpeace@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH v2] mtd: spi-nor: Fix S3AN addressing calculation

The page calculation under spi_nor_s3an_addr_convert() was wrong. On
Default Address Mode we need to perform a divide by page_size.

Fixes: 61cba34bd6c1 ("mtd: spi-nor: Add support for S3AN spi-nor devices")
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---

v2: Suggested by Marek Vasut <marek.vasut@...il.com>
  -Use more descriptive name for page

 drivers/mtd/spi-nor/spi-nor.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 2a643a1bb45e..f5c3ce8ac48b 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -431,11 +431,14 @@ static void spi_nor_unlock_and_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
  */
 static loff_t spi_nor_s3an_addr_convert(struct spi_nor *nor, unsigned int addr)
 {
-	unsigned int offset = addr;
+	unsigned int offset;
+	unsigned int page;
 
-	offset %= nor->page_size;
+	offset = addr % nor->page_size;
+	page = addr / nor->page_size;
+	page <<= (nor->page_size > 512) ? 10 : 9;
 
-	return ((addr - offset) << 1) | offset;
+	return page | offset;
 }
 
 /*
-- 
2.11.0