From dfeae1073583dc35c33b32150e18b7048bbb37e6 Mon Sep 17 00:00:00 2001
From: Tokunori Ikegami <ikegami@allied-telesis.co.jp>
Date: Wed, 30 May 2018 18:32:26 +0900
Subject: [PATCH] mtd: cfi_cmdset_0002: Change write buffer to check correct value
Git-commit: dfeae1073583dc35c33b32150e18b7048bbb37e6
Patch-mainline: v4.18-rc1
References: bsc#1051510

For the word write it is checked if the chip has the correct value.
But it is not checked for the write buffer as only checked if ready.
To make sure for the write buffer change to check the value.

It is enough as this patch is only checking the last written word.
Since it is described by data sheets to check the operation status.

Signed-off-by: Tokunori Ikegami <ikegami@allied-telesis.co.jp>
Reviewed-by: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
Cc: Chris Packham <chris.packham@alliedtelesis.co.nz>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Boris Brezillon <boris.brezillon@free-electrons.com>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>
Cc: linux-mtd@lists.infradead.org
Cc: stable@vger.kernel.org
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/mtd/chips/cfi_cmdset_0002.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index bd0c30ad8ee7..75d2c16029fd 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -1879,7 +1879,7 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
 		if (time_after(jiffies, timeo) && !chip_ready(map, adr))
 			break;
 
-		if (chip_ready(map, adr)) {
+		if (chip_good(map, adr, datum)) {
 			xip_enable(map, chip, adr);
 			goto op_done;
 		}
-- 
2.16.4