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scsi: NCR5380: Check for bus reset 

The SR_RST bit isn't latched. Hence, detecting a bus reset isn't reliable.
When it is detected, the right thing to do is to drop all connected and
disconnected commands. The code for that is already present so refactor it and
call it when SR_RST is set.

Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain 2018-09-27 11:17:11 +10:00 коммит произвёл Martin K. Petersen
Родитель ca694afad7
Коммит 6b0e87a6aa
1 изменённых файлов: 45 добавлений и 29 удалений
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74
drivers/scsi/NCR5380.c
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@ -131,6 +131,7 @@
static int do_abort(struct Scsi_Host *);
static void do_reset(struct Scsi_Host *);
static void bus_reset_cleanup(struct Scsi_Host *);
/**
* initialize_SCp - init the scsi pointer field
@ -883,7 +884,14 @@ static irqreturn_t __maybe_unused NCR5380_intr(int irq, void *dev_id)
/* Probably Bus Reset */
NCR5380_read(RESET_PARITY_INTERRUPT_REG);
dsprintk(NDEBUG_INTR, instance, "unknown interrupt\n");
if (sr & SR_RST) {
/* Certainly Bus Reset */
shost_printk(KERN_WARNING, instance,
"bus reset interrupt\n");
bus_reset_cleanup(instance);
} else {
dsprintk(NDEBUG_INTR, instance, "unknown interrupt\n");
}
#ifdef SUN3_SCSI_VME
dregs->csr |= CSR_DMA_ENABLE;
#endif
@ -2305,31 +2313,12 @@ out:
}
/**
* NCR5380_host_reset - reset the SCSI host
* @cmd: SCSI command undergoing EH
*
* Returns SUCCESS
*/
static int NCR5380_host_reset(struct scsi_cmnd *cmd)
static void bus_reset_cleanup(struct Scsi_Host *instance)
{
struct Scsi_Host *instance = cmd->device->host;
struct NCR5380_hostdata *hostdata = shost_priv(instance);
int i;
unsigned long flags;
struct NCR5380_cmd *ncmd;
spin_lock_irqsave(&hostdata->lock, flags);
#if (NDEBUG & NDEBUG_ANY)
shost_printk(KERN_INFO, instance, __func__);
#endif
NCR5380_dprint(NDEBUG_ANY, instance);
NCR5380_dprint_phase(NDEBUG_ANY, instance);
do_reset(instance);
/* reset NCR registers */
NCR5380_write(MODE_REG, MR_BASE);
NCR5380_write(TARGET_COMMAND_REG, 0);
@ -2341,14 +2330,6 @@ static int NCR5380_host_reset(struct scsi_cmnd *cmd)
* commands!
*/
list_for_each_entry(ncmd, &hostdata->unissued, list) {
struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
cmd->result = DID_RESET << 16;
cmd->scsi_done(cmd);
}
INIT_LIST_HEAD(&hostdata->unissued);
if (hostdata->selecting) {
hostdata->selecting->result = DID_RESET << 16;
complete_cmd(instance, hostdata->selecting);
@ -2382,6 +2363,41 @@ static int NCR5380_host_reset(struct scsi_cmnd *cmd)
queue_work(hostdata->work_q, &hostdata->main_task);
maybe_release_dma_irq(instance);
}
/**
* NCR5380_host_reset - reset the SCSI host
* @cmd: SCSI command undergoing EH
*
* Returns SUCCESS
*/
static int NCR5380_host_reset(struct scsi_cmnd *cmd)
{
struct Scsi_Host *instance = cmd->device->host;
struct NCR5380_hostdata *hostdata = shost_priv(instance);
unsigned long flags;
struct NCR5380_cmd *ncmd;
spin_lock_irqsave(&hostdata->lock, flags);
#if (NDEBUG & NDEBUG_ANY)
shost_printk(KERN_INFO, instance, __func__);
#endif
NCR5380_dprint(NDEBUG_ANY, instance);
NCR5380_dprint_phase(NDEBUG_ANY, instance);
list_for_each_entry(ncmd, &hostdata->unissued, list) {
struct scsi_cmnd *scmd = NCR5380_to_scmd(ncmd);
scmd->result = DID_RESET << 16;
scmd->scsi_done(scmd);
}
INIT_LIST_HEAD(&hostdata->unissued);
do_reset(instance);
bus_reset_cleanup(instance);
spin_unlock_irqrestore(&hostdata->lock, flags);
return SUCCESS;