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From:   Sasha Levin <Alexander.Levin@microsoft.com>
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CC:     Albert Hsieh <wen.hsieh@broadcom.com>,
        Richard Weinberger <richard@nod.at>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.14 014/110] mtd: nand: brcmnand: Zero bitflip is
 not an error
Thread-Topic: [PATCH AUTOSEL for 4.14 014/110] mtd: nand: brcmnand: Zero
 bitflip is not an error
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Date:   Sat, 3 Feb 2018 18:00:33 +0000
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From: Albert Hsieh <wen.hsieh@broadcom.com>

[ Upstream commit e44b9a9c135727f3410e029910275f40681dc8bc ]

A negative return value of brcmstb_nand_verify_erased_page() indicates a
real bitflip error of an erased page, and other return values (>=3D 0) show
the corrected bitflip number. Zero return value means no bitflip, but the
current driver code treats it as an error, and eventually leads to
falsely reported ECC error.

Fixes: 02b88eea9f9c ("mtd: brcmnand: Add check for erased page bitflip")
Signed-off-by: Albert Hsieh <wen.hsieh@broadcom.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/mtd/nand/brcmnand/brcmnand.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmna=
nd/brcmnand.c
index e0eb51d8c012..dd56a671ea42 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -1763,7 +1763,7 @@ try_dmaread:
 			err =3D brcmstb_nand_verify_erased_page(mtd, chip, buf,
 							      addr);
 			/* erased page bitflips corrected */
-			if (err > 0)
+			if (err >=3D 0)
 				return err;
 		}
=20
--=20
2.11.0