linux-kernel - [PATCH 4.9 08/56] mtd: nand: brcmnand: Zero bitflip is not an error

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Message-Id: <20180302084450.053785624@linuxfoundation.org>
Date:   Fri,  2 Mar 2018 09:50:54 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Albert Hsieh <wen.hsieh@...adcom.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 08/56] mtd: nand: brcmnand: Zero bitflip is not an error

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Albert Hsieh <wen.hsieh@...adcom.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 (>= 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@...adcom.com>
Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/mtd/nand/brcmnand/brcmnand.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -1763,7 +1763,7 @@ try_dmaread:
 			err = brcmstb_nand_verify_erased_page(mtd, chip, buf,
 							      addr);
 			/* erased page bitflips corrected */
-			if (err > 0)
+			if (err >= 0)
 				return err;
 		}