Revert "nvme-pci: Make driver prefer asynchronous shutdown"

This reverts commit ba82e10.

The series is being reverted before -rc1 as there are still reports of
lockups on shutdown, so it's not quite ready for "prime time."

Reported-by: Andrey Skvortsov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Cc: Christoph Hellwig <[email protected]>
Cc: David Jeffery <[email protected]>
Cc: Keith Busch <[email protected]>
Cc: Laurence Oberman <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Sagi Grimberg <[email protected]>
Cc: Stuart Hayes <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gregkh

drivers/nvme/host/pci.c

@@ -3580,7 +3580,6 @@ static struct pci_driver nvme_driver = {
 	.shutdown	= nvme_shutdown,
 	.driver		= {
 		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,
-		.async_shutdown_enable	= true,
 #ifdef CONFIG_PM_SLEEP
 		.pm		= &nvme_dev_pm_ops,
 #endif