scsi: mpt3sas: Stop fw fault watchdog work item during system shutdown

During system shutdown or reboot, mpt3sas will reset the firmware back to
ready state. However, the driver leaves running a watchdog work item
intended to keep the firmware in operational state. This causes a second,
unneeded reset on shutdown and moves the firmware back to operational
instead of in ready state as intended. And if the mpt3sas_fwfault_debug
module parameter is set, this extra reset also panics the system.

mpt3sas's scsih_shutdown needs to stop the watchdog before resetting the
firmware back to ready state.

Link: https://lore.kernel.org/r/[email protected]
Fixes: fae2160 ("scsi: mpt3sas: Transition IOC to Ready state during shutdown")
Tested-by: Laurence Oberman <[email protected]>
Acked-by: Sreekanth Reddy <[email protected]>
Signed-off-by: David Jeffery <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: David Jeffery

drivers/scsi/mpt3sas/mpt3sas_scsih.c

@@ -11386,6 +11386,7 @@ scsih_shutdown(struct pci_dev *pdev)
 	_scsih_ir_shutdown(ioc);
 	_scsih_nvme_shutdown(ioc);
 	mpt3sas_base_mask_interrupts(ioc);
+	mpt3sas_base_stop_watchdog(ioc);
 	ioc->shost_recovery = 1;
 	mpt3sas_base_make_ioc_ready(ioc, SOFT_RESET);
 	ioc->shost_recovery = 0;