linux-kernel - [PATCH 3/4] g_NCR5380: Limit sg_tablesize to avoid PDMA read overruns on DTC436

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Message-Id: <9a3c7141589fc15bc8457523ba5912da2d26a93d.1497528687.git.fthain@telegraphics.com.au>
Date:   Thu, 15 Jun 2017 08:17:56 -0400 (EDT)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Ondrej Zary <linux@...nbow-software.org>
Cc:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Michael Schmitz <schmitzmic@...il.com>
Subject: [PATCH 3/4] g_NCR5380: Limit sg_tablesize to avoid PDMA read overruns
 on DTC436

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 <fthain@...egraphics.com.au>
---
 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 1e1cf7ca86fa..784913193ea5 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