Re: [PATCH 3/4] iommu/arm-smmu-v3: Add support for PCI ATS

[Sinan Kaya <Okaya@xxxxxxxxxx>]

On 3/20/2019 1:36 PM, Jean-Philippe Brucker wrote:
> pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ATS);
> +	if (!pos)
> +		return -ENOSYS;
> +

You don't need this. pci_enable_ats() validates this via.

	if (!dev->ats_cap)
		return -EINVAL;