| From | Jiri Slaby <> | Subject | [PATCH 3.12 077/170] mtd: nand: omap: fix BCHx ecc.correct to return detected bit-flips in erased-page | Date | Fri, 18 Jul 2014 14:11:22 +0200 |
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From: pekon gupta <pekon@ti.com>
3.12-stable review patch. If anyone has any objections, please let me know.
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commit f306e8c3b667632952f1a4a74ffb910bbc06255f upstream.
fixes: commit 62116e5171e00f85a8d53f76e45b84423c89ff34 mtd: nand: omap2: Support for hardware BCH error correction.
In omap_elm_correct_data(), if bitflip_count in an erased-page is within the correctable limit (< ecc.strength), then it is not indicated back to the caller ecc->read_page().
This mis-guides upper layers like MTD and UBIFS layer to assume erased-page as perfectly clean and use it for writing even if actual bitflip_count was dangerously high (bitflip_count > mtd->bitflip_threshold).
This patch fixes this above issue, by returning 'stats' to caller ecc->read_page() under all scenarios.
Reported-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Pekon Gupta <pekon@ti.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- drivers/mtd/nand/omap2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c index 4ecf0e5fd484..0332d0b2d73a 100644 --- a/drivers/mtd/nand/omap2.c +++ b/drivers/mtd/nand/omap2.c @@ -1463,7 +1463,7 @@ static int omap_elm_correct_data(struct mtd_info *mtd, u_char *data, /* Check if any error reported */ if (!is_error_reported) - return 0; + return stat; /* Decode BCH error using ELM module */ elm_decode_bch_error_page(info->elm_dev, ecc_vec, err_vec); -- 2.0.0
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