Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751411AbdFXGhm (ORCPT ); Sat, 24 Jun 2017 02:37:42 -0400 Received: from kvm5.telegraphics.com.au ([98.124.60.144]:45814 "EHLO kvm5.telegraphics.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751276AbdFXGhi (ORCPT ); Sat, 24 Jun 2017 02:37:38 -0400 To: "James E.J. Bottomley" , "Martin K. Petersen" , Ondrej Zary Cc: , , Michael Schmitz Message-Id: <3b30382cbcb350793a5500615e37d12aca74f3ab.1498285948.git.fthain@telegraphics.com.au> In-Reply-To: References: From: Finn Thain Subject: [PATCH v2 3/5] g_NCR5380: Limit sg_tablesize to avoid PDMA read overruns on DTC436 Date: Sat, 24 Jun 2017 02:37:36 -0400 (EDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 704 Lines: 23 Back-to-back DMA receive transfers can lose a byte due to a 5380 flaw. This makes scatter-receive difficult or impossible on affected hardware, so limit the scatter/gather tablesize to 1. Signed-off-by: Finn Thain --- drivers/scsi/g_NCR5380.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c index 911a4300ea51..7b3626fe120b 100644 --- a/drivers/scsi/g_NCR5380.c +++ b/drivers/scsi/g_NCR5380.c @@ -247,6 +247,7 @@ static int generic_NCR5380_init_one(struct scsi_host_template *tpnt, case BOARD_DTC3181E: ports = dtc_3181e_ports; magic = ncr_53c400a_magic; + tpnt->sg_tablesize = 1; break; } -- 2.13.0