nvme: release namespace SRCU protection before performing controller ioctls

	if (unlikely(!ns))

		return -EWOULDBLOCK;

	/*

	 * Handle ioctls that apply to the controller instead of the namespace

	 * seperately and drop the ns SRCU reference early.  This avoids a

	 * deadlock when deleting namespaces using the passthrough interface.

	 */

	if (cmd == NVME_IOCTL_ADMIN_CMD || is_sed_ioctl(cmd)) {

		struct nvme_ctrl *ctrl = ns->ctrl;

		nvme_get_ctrl(ns->ctrl);

		nvme_put_ns_from_disk(head, srcu_idx);

		if (cmd == NVME_IOCTL_ADMIN_CMD)

			ret = nvme_user_cmd(ctrl, NULL, argp);

		else

			ret = sed_ioctl(ctrl->opal_dev, cmd, argp);

		nvme_put_ctrl(ctrl);

		return ret;

	}

	switch (cmd) {

	case NVME_IOCTL_ID:

		force_successful_syscall_return();

		ret = ns->head->ns_id;

		break;

	case NVME_IOCTL_ADMIN_CMD:

		ret = nvme_user_cmd(ns->ctrl, NULL, argp);

		break;

	case NVME_IOCTL_IO_CMD:

		ret = nvme_user_cmd(ns->ctrl, ns, argp);

		break;

	default:

		if (ns->ndev)

			ret = nvme_nvm_ioctl(ns, cmd, arg);

		else if (is_sed_ioctl(cmd))

			ret = sed_ioctl(ns->ctrl->opal_dev, cmd, argp);

		else

			ret = -ENOTTY;

	}