From: Kevin Barnett <kevin.barnett@microsemi.com>
Date: Thu, 10 Aug 2017 13:47:03 -0500
Subject: scsi: smartpqi: update kexec and power down support
Patch-mainline: v4.14-rc1
Git-commit: b6d478119edeaca964b46796fd26893b81f8a561
References: FATE#323891,bsc#1049514

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.benesh@microsemi.com>
Signed-off-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/scsi/smartpqi/smartpqi_init.c |    1 +
 1 file changed, 1 insertion(+)

--- 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
 	 * storage.
 	 */
 	rc = pqi_flush_cache(ctrl_info, SHUTDOWN);
+	pqi_reset(ctrl_info);
 	if (rc == 0)
 		return;