On Fri, Nov 3, 2023 at 5:45 PM Jason Gunthorpe <jgg@xxxxxxxxxx> wrote:
>
> Nothing needs this pointer. Return a normal error code with the usual
> IOMMU semantic that ENODEV means 'there is no IOMMU driver'.
>
> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> ---
> drivers/acpi/scan.c | 24 +++++++++++++++---------
> 1 file changed, 15 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index a6891ad0ceee2c..fbabde001a23a2 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -1562,8 +1562,7 @@ static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
> return fwspec ? fwspec->ops : NULL;
> }
>
> -static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
> - const u32 *id_in)
> +static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in)
> {
> int err;
> const struct iommu_ops *ops;
> @@ -1574,7 +1573,7 @@ static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
> */
> ops = acpi_iommu_fwspec_ops(dev);
> if (ops)
> - return ops;
> + return 0;
>
> err = iort_iommu_configure_id(dev, id_in);
> if (err && err != -EPROBE_DEFER)
> @@ -1589,12 +1588,14 @@ static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
>
> /* Ignore all other errors apart from EPROBE_DEFER */
> if (err == -EPROBE_DEFER) {
> - return ERR_PTR(err);
> + return err;
> } else if (err) {
> dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
> - return NULL;
> + return -ENODEV;
> }
> - return acpi_iommu_fwspec_ops(dev);
> + if (!acpi_iommu_fwspec_ops(dev))
> + return -ENODEV;
> + return 0;
> }
>
> #else /* !CONFIG_IOMMU_API */
> @@ -1623,7 +1624,7 @@ static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
> int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
> const u32 *input_id)
> {
> - const struct iommu_ops *iommu;
> + int ret;
>
> if (attr == DEV_DMA_NOT_SUPPORTED) {
> set_dma_ops(dev, &dma_dummy_ops);
> @@ -1632,10 +1633,15 @@ int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
>
> acpi_arch_dma_setup(dev);
>
> - iommu = acpi_iommu_configure_id(dev, input_id);
> - if (PTR_ERR(iommu) == -EPROBE_DEFER)
> + ret = acpi_iommu_configure_id(dev, input_id);
> + if (ret == -EPROBE_DEFER)
> return -EPROBE_DEFER;
>
> + /*
> + * Historically this routine doesn't fail driver probing due to errors
> + * in acpi_iommu_configure()
> + */
> +
> arch_setup_dma_ops(dev, 0, U64_MAX, attr == DEV_DMA_COHERENT);
>
> return 0;
> --
> 2.42.0
>
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