iommu/of: Take a ref to the IOMMU driver during ->of_xlate()

#include <linux/export.h>

#include <linux/iommu.h>

#include <linux/limits.h>

#include <linux/pci.h>

#include <linux/module.h>

#include <linux/msi.h>

#include <linux/of.h>

#include <linux/of_iommu.h>

#include <linux/of_pci.h>

#include <linux/pci.h>

#include <linux/slab.h>

#include <linux/fsl/mc.h>

{

	const struct iommu_ops *ops;

	struct fwnode_handle *fwnode = &iommu_spec->np->fwnode;

	int err;

	int ret;

	ops = iommu_ops_from_fwnode(fwnode);

	if ((ops && !ops->of_xlate) ||

	    !of_device_is_available(iommu_spec->np))

		return NO_IOMMU;

	err = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, ops);

	if (err)

		return err;

	ret = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, ops);

	if (ret)

		return ret;

	/*

	 * The otherwise-empty fwspec handily serves to indicate the specific

	 * IOMMU device we're waiting for, which will be useful if we ever get

	if (!ops)

		return driver_deferred_probe_check_state(dev);

	return ops->of_xlate(dev, iommu_spec);

	if (!try_module_get(ops->owner))

		return -ENODEV;

	ret = ops->of_xlate(dev, iommu_spec);

	module_put(ops->owner);

	return ret;

}

struct of_pci_iommu_alias_info {