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Groups > linux.kernel > #1674031
| From | Finn Thain <fthain@telegraphics.com.au> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v2 3/5] g_NCR5380: Limit sg_tablesize to avoid PDMA read overruns on DTC436 |
| Date | 2017-06-24 08:40 +0200 |
| Message-ID | <tVMTE-4mC-15@gated-at.bofh.it> (permalink) |
| References | <tVMTD-4mC-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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
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[PATCH v2 3/5] g_NCR5380: Limit sg_tablesize to avoid PDMA read overruns on DTC436 Finn Thain <fthain@telegraphics.com.au> - 2017-06-24 08:40 +0200
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