[ Upstream commit 0c72191da68638a479602dd515b587ada913184a ] Drivers shouldn't be calling block/unblock session for cmd cleanup because the functions can change the session state from under libiscsi. This adds a new a driver level bit so it can block all I/O the host while it drains the card. Link: https://lore.kernel.org/r/20210525181821.7617-26-michael.christie@oracle.com Reviewed-by: Manish Rangankar <mrangankar@marvell.com> Signed-off-by: Mike Christie <michael.christie@oracle.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>