[PATCH v2 3/5] g_NCR5380: Limit sg_tablesize to avoid PDMA read overruns on DTC436

Finn Thain
2017-06-24T06:37:42Z

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@telegraphics.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 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