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scsi: mac_scsi: Treat Last Byte Sent time-out as failure 

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>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Stan Johnson <userm57@yahoo.com>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain 2019-06-09 11:19:11 +10:00 committed by Martin K. Petersen
parent 8fb9a64eb6
commit 7c1f3e3447
1 changed files with 4 additions and 1 deletions
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5
drivers/scsi/mac_scsi.c
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@ -360,9 +360,12 @@ 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;
}