Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752614AbdGGXxb (ORCPT ); Fri, 7 Jul 2017 19:53:31 -0400 Received: from g4t3426.houston.hpe.com ([15.241.140.75]:52844 "EHLO g4t3426.houston.hpe.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751059AbdGGXxa (ORCPT ); Fri, 7 Jul 2017 19:53:30 -0400 From: Toshi Kani To: dan.j.williams@intel.com Cc: vishal.l.verma@intel.com, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org Subject: [PATCH] libnvdimm: fix badblock range handling of ARS range Date: Fri, 7 Jul 2017 17:44:26 -0600 Message-Id: <20170707234426.25136-1-toshi.kani@hpe.com> X-Mailer: git-send-email 2.9.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1382 Lines: 39 __add_badblock_range() does not account sector alignment when it sets 'num_sectors'. Therefore, an ARS error record range spanning across two sectors is set to a single sector length, which leaves the 2nd sector unprotected. Change __add_badblock_range() to set 'num_sectors' properly. Fixes: 0caeef63e6d2f866d85bb507bf63e0ce8ec91cef Signed-off-by: Toshi Kani Cc: Dan Williams Cc: Vishal Verma Cc: --- drivers/nvdimm/core.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c index 2dee908..932c3994 100644 --- a/drivers/nvdimm/core.c +++ b/drivers/nvdimm/core.c @@ -421,14 +421,15 @@ static void set_badblock(struct badblocks *bb, sector_t s, int num) static void __add_badblock_range(struct badblocks *bb, u64 ns_offset, u64 len) { const unsigned int sector_size = 512; - sector_t start_sector; + sector_t start_sector, end_sector; u64 num_sectors; u32 rem; start_sector = div_u64(ns_offset, sector_size); - num_sectors = div_u64_rem(len, sector_size, &rem); + end_sector = div_u64_rem(ns_offset + len, sector_size, &rem); if (rem) - num_sectors++; + end_sector++; + num_sectors = end_sector - start_sector; if (unlikely(num_sectors > (u64)INT_MAX)) { u64 remaining = num_sectors;