[PATCH 5/7] smartpqi: update kexec and power down support

[Don Brace]

From: Kevin Barnett <kevin.barn...@microsemi.com>

add PQI reset to driver shutdown callback to
work around controller bug.

During an 1.) OS shutdown or 2.) kexec outside of a kdump,
the Linux kernel will clear BME on our controller.

If BME is cleared during a controller/host PCIe transfer,
the controller will lock up.

So we perform a PQI reset in the driver's shutdown callback
function to eliminate the possibility of a controller/host
PCIe transfer being active when the kernel clears BME immediately
after calling the driver's shutdown callback.

Reviewed-by: Scott Benesh <scott.ben...@microsemi.com>
Signed-off-by: Kevin Barnett <kevin.barn...@microsemi.com>
Signed-off-by: Don Brace <don.br...@microsemi.com>
---
 drivers/scsi/smartpqi/smartpqi_init.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c 
b/drivers/scsi/smartpqi/smartpqi_init.c
index 70b1f97..afd3eed 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -6700,6 +6700,7 @@ static void pqi_shutdown(struct pci_dev *pci_dev)
         * storage.
         */
        rc = pqi_flush_cache(ctrl_info, SHUTDOWN);
+       pqi_reset(ctrl_info);
        if (rc == 0)
                return;