Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761565AbaGRNGd (ORCPT ); Fri, 18 Jul 2014 09:06:33 -0400 Received: from bband-dyn38.178-41-141.t-com.sk ([178.41.141.38]:17178 "EHLO ip4-83-240-18-248.cust.nbox.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934154AbaGRNCi (ORCPT ); Fri, 18 Jul 2014 09:02:38 -0400 From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, pekon gupta , Brian Norris , 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 Message-Id: <62874b837dc5de00f3c8de646e80b73c52d75b01.1405685481.git.jslaby@suse.cz> X-Mailer: git-send-email 2.0.0 In-Reply-To: <48e8cad86bb1241c08bdaa80db022c25068ff8e0.1405685481.git.jslaby@suse.cz> References: <48e8cad86bb1241c08bdaa80db022c25068ff8e0.1405685481.git.jslaby@suse.cz> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: pekon gupta 3.12-stable review patch. If anyone has any objections, please let me know. =============== 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 Signed-off-by: Pekon Gupta Signed-off-by: Brian Norris Signed-off-by: Jiri Slaby --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/