linux-kernel - [PATCH 4.19 262/271] mtd: spinand: read returns badly if the last page has bitflips

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Message-Id: <20190724191717.652553495@linuxfoundation.org>
Date:   Wed, 24 Jul 2019 21:22:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Weixiong Liao <liaoweixiong@...winnertech.com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH 4.19 262/271] mtd: spinand: read returns badly if the last page has bitflips

From: liaoweixiong <liaoweixiong@...winnertech.com>

commit b83408b580eccf8d2797cd6cb9ae42c2a28656a7 upstream.

In case of the last page containing bitflips (ret > 0),
spinand_mtd_read() will return that number of bitflips for the last
page while it should instead return max_bitflips like it does when the
last page read returns with 0.

Signed-off-by: Weixiong Liao <liaoweixiong@...winnertech.com>
Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
Reviewed-by: Frieder Schrempf <frieder.schrempf@...tron.de>
Cc: stable@...r.kernel.org
Fixes: 7529df465248 ("mtd: nand: Add core infrastructure to support SPI NANDs")
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mtd/nand/spi/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -572,12 +572,12 @@ static int spinand_mtd_read(struct mtd_i
 		if (ret == -EBADMSG) {
 			ecc_failed = true;
 			mtd->ecc_stats.failed++;
-			ret = 0;
 		} else {
 			mtd->ecc_stats.corrected += ret;
 			max_bitflips = max_t(unsigned int, max_bitflips, ret);
 		}
 
+		ret = 0;
 		ops->retlen += iter.req.datalen;
 		ops->oobretlen += iter.req.ooblen;
 	}