[PATCH RFC 03/17] of: Use -ENODEV consistently in of_iommu_configure()

[Jason Gunthorpe]

On Fri, Nov 03, 2023 at 03:03:53PM -0700, Jerry Snitselaar wrote:
> With this the following can be simplified in of_iommu_configure_dev_id:
> 
> diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
> index 4f77495a2543..b9b995712029 100644
> --- a/drivers/iommu/of_iommu.c
> +++ b/drivers/iommu/of_iommu.c
> @@ -61,7 +61,7 @@ static int of_iommu_configure_dev_id(struct device_node *master_np,
>  			 "iommu-map-mask", &iommu_spec.np,
>  			 iommu_spec.args);
>  	if (err)
> -		return err == -ENODEV ? NO_IOMMU : err;
> +		return err;

Yeah, at this point it just makes sense to erase the whole thing:

-#define NO_IOMMU       -ENODEV
-
 static int of_iommu_xlate(struct device *dev,
                          struct of_phandle_args *iommu_spec)
 {
@@ -29,7 +27,7 @@ static int of_iommu_xlate(struct device *dev,
        ops = iommu_ops_from_fwnode(fwnode);
        if ((ops && !ops->of_xlate) ||
            !of_device_is_available(iommu_spec->np))
-               return NO_IOMMU;
+               return -ENODEV;
 
        ret = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, ops);
        if (ret)
@@ -61,7 +59,7 @@ static int of_iommu_configure_dev_id(struct device_node *master_np,
                         "iommu-map-mask", &iommu_spec.np,
                         iommu_spec.args);
        if (err)
-               return err == -ENODEV ? NO_IOMMU : err;
+               return err;
 
        err = of_iommu_xlate(dev, &iommu_spec);
        of_node_put(iommu_spec.np);
@@ -72,7 +70,7 @@ static int of_iommu_configure_dev(struct device_node *master_np,
                                  struct device *dev)
 {
        struct of_phandle_args iommu_spec;
-       int err = NO_IOMMU, idx = 0;
+       int err = -ENODEV, idx = 0;
 
        while (!of_parse_phandle_with_args(master_np, "iommus",
                                           "#iommu-cells",

Thanks,
Jason