linux-kernel - [RFC 2/6] mtd: spi-nor: change return value of read_xfer and write

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Date:   Fri, 17 Mar 2017 18:13:52 +0530
From:   Rahul Bedarkar <rahul.bedarkar@...tec.com>
To:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC:     Rahul Bedarkar <rahul.bedarkar@...tec.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>
Subject: [RFC 2/6] mtd: spi-nor: change return value of read_xfer and write_xfer

Change return value of read_xfer and write_xfer to allow returning
amount of data transferred and errors as read(2)/write(2) does.

This makes read_xfer/write_xfer inline with read/write hooks.

Inspired-from: Commit 59451e1233bd ("mtd: spi-nor: change return value of read/write")
Signed-off-by: Rahul Bedarkar <rahul.bedarkar@...tec.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: Brian Norris <computersforpeace@...il.com>
Cc: Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc: Marek Vasut <marek.vasut@...il.com>
Cc: Richard Weinberger <richard@....at>
Cc: Cyrille Pitchen <cyrille.pitchen@...el.com>
---
 include/linux/mtd/spi-nor.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 0be3f86..64b4a54 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -223,9 +223,9 @@ struct spi_nor {
 
 	int (*prepare)(struct spi_nor *nor, enum spi_nor_ops ops);
 	void (*unprepare)(struct spi_nor *nor, enum spi_nor_ops ops);
-	int (*read_xfer)(struct spi_nor *nor, struct spi_nor_xfer_cfg *cfg,
+	ssize_t (*read_xfer)(struct spi_nor *nor, struct spi_nor_xfer_cfg *cfg,
 			 u8 *buf, size_t len);
-	int (*write_xfer)(struct spi_nor *nor, struct spi_nor_xfer_cfg *cfg,
+	ssize_t (*write_xfer)(struct spi_nor *nor, struct spi_nor_xfer_cfg *cfg,
 			  u8 *buf, size_t len);
 	int (*read_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
 	int (*write_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
-- 
2.6.2