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scsi: NCR5380: Handle BSY signal loss during information transfer phases

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Improve robustness by checking for a lost BSY signal during the information
transfer loop. The status register is being polled anyway, so a BSY check
costs nothing. BSY signal loss could be caused by a target error or a
kicked plug etc. A bus reset is another possibility but that is already
handled and hostdata->connected would be NULL.

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Link: https://lore.kernel.org/r/d253dddaf4d9bc17b8ee02ea2b731d92f25b16f1.1723001788.git.fthain@linux-m68k.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain 2024-08-07 13:36:28 +10:00 committed by Martin K. Petersen
parent 1c71065df2
commit 086c4802cf
1 changed files with 14 additions and 8 deletions
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22
drivers/scsi/NCR5380.c
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@ -1244,8 +1244,6 @@ out:
* is in same phase.
*
* Also, *phase, *count, *data are modified in place.
*
* XXX Note : handling for bus free may be useful.
*/
/*
@ -1277,8 +1275,8 @@ static int NCR5380_transfer_pio(struct Scsi_Host *instance,
* valid
*/
if (NCR5380_poll_politely(hostdata, STATUS_REG, SR_REQ, SR_REQ,
HZ * can_sleep) < 0)
if (NCR5380_poll_politely(hostdata, STATUS_REG, SR_REQ | SR_BSY,
SR_REQ | SR_BSY, HZ * can_sleep) < 0)
break;
dsprintk(NDEBUG_HANDSHAKE, instance, "REQ asserted\n");
@ -1666,9 +1664,6 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance,
* Side effects : SCSI things happen, the disconnected queue will be
* modified if a command disconnects, *instance->connected will
* change.
*
* XXX Note : we need to watch for bus free or a reset condition here
* to recover from an unexpected bus free condition.
*/
static void NCR5380_information_transfer(struct Scsi_Host *instance)
@ -2009,9 +2004,20 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
NCR5380_dprint(NDEBUG_ANY, instance);
} /* switch(phase) */
} else {
int err;
spin_unlock_irq(&hostdata->lock);
NCR5380_poll_politely(hostdata, STATUS_REG, SR_REQ, SR_REQ, HZ);
err = NCR5380_poll_politely(hostdata, STATUS_REG,
SR_REQ, SR_REQ, HZ);
spin_lock_irq(&hostdata->lock);
if (err < 0 && hostdata->connected &&
!(NCR5380_read(STATUS_REG) & SR_BSY)) {
scmd_printk(KERN_ERR, hostdata->connected,
"BSY signal lost\n");
do_reset(instance);
bus_reset_cleanup(instance);
}
}
}
}