scsi: pm80xx: Fixed system hang issue during kexec boot

When the firmware is not responding, execution of kexec boot causes a system
hang. When firmware assertion happened, driver get notified with interrupt
vector updated in MPI configuration table. Then, the driver will read
scratchpad register and set controller_fatal_error flag to true.

Signed-off-by: Deepak Ukey <deepak.ukey@microchip.com>
Signed-off-by: Viswas G <Viswas.G@microchip.com>
Acked-by: Jack Wang <jinpu.wang@profitbricks.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index e063faad66f5..b1e7d2699311 100644
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -396,6 +396,13 @@ static int pm8001_task_exec(struct sas_task *task,
                 return 0;
         }
         pm8001_ha = pm8001_find_ha_by_dev(task->dev);
+        if (pm8001_ha->controller_fatal_error) {
+                struct task_status_struct *ts = &t->task_status;
+
+                ts->resp = SAS_TASK_UNDELIVERED;
+                t->task_done(t);
+                return 0;
+        }
         PM8001_IO_DBG(pm8001_ha, pm8001_printk("pm8001_task_exec device \n "));
         spin_lock_irqsave(&pm8001_ha->lock, flags);
         do {