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Subject[PATCH 7/7] scsi: mac_scsi: Treat Last Byte Sent time-out as failure
Date
A system bus error during a PDMA send operation can result in bytes being
lost. Theoretically that could cause the target to remain in DATA OUT
phase and the initiator (expecting a phase change) would time-out waiting
for the Last Byte Sent flag. Should that happen, fail the transfer so the
core driver will stop using PDMA with this target.

Cc: Michael Schmitz <schmitzmic@gmail.com>
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
---
drivers/scsi/mac_scsi.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/mac_scsi.c b/drivers/scsi/mac_scsi.c
index 2e503f06ac99..68d4665112b5 100644
--- a/drivers/scsi/mac_scsi.c
+++ b/drivers/scsi/mac_scsi.c
@@ -188,9 +188,12 @@ static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata,
if (hostdata->pdma_residual == 0) {
if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG,
TCR_LAST_BYTE_SENT,
- TCR_LAST_BYTE_SENT, HZ / 64) < 0)
+ TCR_LAST_BYTE_SENT,
+ HZ / 64) < 0) {
scmd_printk(KERN_ERR, hostdata->connected,
"%s: Last Byte Sent timeout\n", __func__);
+ result = -1;
+ }
goto out;
}

--
2.21.0
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