From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936285AbdDSOxo (ORCPT ); Wed, 19 Apr 2017 10:53:44 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:47244 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935663AbdDSOpF (ORCPT ); Wed, 19 Apr 2017 10:45:05 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Fam Zheng , "Martin K. Petersen" Subject: [PATCH 4.9 29/69] scsi: sd: Consider max_xfer_blocks if opt_xfer_blocks is unusable Date: Wed, 19 Apr 2017 16:42:45 +0200 Message-Id: <20170419141618.152165624@linuxfoundation.org> X-Mailer: git-send-email 2.12.2 In-Reply-To: <20170419141616.919951169@linuxfoundation.org> References: <20170419141616.919951169@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Fam Zheng commit 6780414519f91c2a84da9baa963a940ac916f803 upstream. If device reports a small max_xfer_blocks and a zero opt_xfer_blocks, we end up using BLK_DEF_MAX_SECTORS, which is wrong and r/w of that size may get error. [mkp: tweaked to avoid setting rw_max twice and added typecast] Fixes: ca369d51b3e ("block/sd: Fix device-imposed transfer length limits") Signed-off-by: Fam Zheng Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/sd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2877,7 +2877,8 @@ static int sd_revalidate_disk(struct gen q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks); rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks); } else - rw_max = BLK_DEF_MAX_SECTORS; + rw_max = min_not_zero(logical_to_sectors(sdp, dev_max), + (sector_t)BLK_DEF_MAX_SECTORS); /* Combine with controller limits */ q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));