[PATCH v3] mtd: cfi_cmdset_0002: Change write buffer to check correct value

[IKEGAMI Tokunori]

From: Tokunori Ikegami <ikegami at allied-telesis.co.jp>

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 at allied-telesis.co.jp>
Cc: Chris Packham <chris.packham at alliedtelesis.co.nz>
Cc: Brian Norris <computersforpeace at gmail.com>
Cc: David Woodhouse <dwmw2 at infradead.org>
Cc: Boris Brezillon <boris.brezillon at free-electrons.com>
Cc: Marek Vasut <marek.vasut at gmail.com>
Cc: Richard Weinberger <richard at nod.at>
Cc: Cyrille Pitchen <cyrille.pitchen at wedev4u.fr>
Cc: linux-mtd at lists.infradead.org
---
No difference for the change itself from the original patch v1.
But just updated the patch subject to add version as v3.
Form the original patch v1 it is also changed to add Brian as Cc and the patch is sent to Boris-san as To.
  Note: This was changed from the second patch v2 and this v3 patch is not changed about this.

This fix is required to resolve the flash write error caused on our products.

This patch itself is not depended to other related patches to fix for the flash erase error.
The flash erase error is not able to still reproduce at this moment.
So I will do fix the flash erase error separately.

But the flash write error can be reproduced and this fix can resolve it.
So please review the patch again and if any problem please let me know.


 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 56aa6b75213d..5e9f2ca0a6c1 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_ready(map, adr) && chip_good(map, adr, datum)) {
 			xip_enable(map, chip, adr);
 			goto op_done;
 		}
-- 
2.16.1