lkml.org 
[lkml]   [2020]   [Sep]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: [PATCH v3 2/3] iommu/tegra-smmu: Rework .probe_device and .attach_dev
    From
    Date
    ...
    > static int tegra_smmu_attach_dev(struct iommu_domain *domain,
    > struct device *dev)
    > {
    > + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
    > struct tegra_smmu *smmu = dev_iommu_priv_get(dev);
    > struct tegra_smmu_as *as = to_smmu_as(domain);
    > - struct device_node *np = dev->of_node;
    > - struct of_phandle_args args;
    > unsigned int index = 0;
    > int err = 0;
    >
    > - while (!of_parse_phandle_with_args(np, "iommus", "#iommu-cells", index,
    > - &args)) {
    > - unsigned int swgroup = args.args[0];
    > -
    > - if (args.np != smmu->dev->of_node) {
    > - of_node_put(args.np);
    > - continue;
    > - }
    > -
    > - of_node_put(args.np);
    > + if (!fwspec || fwspec->ops != &tegra_smmu_ops)
    > + return -ENOENT;

    In previous reply you said that these fwspec checks are borrowed from
    the arm-smmu driver, but I'm now looking at what other drivers do and I
    don't see them having this check.

    Hence I'm objecting the need to have this check here. You either should
    give a rational to having the check or it should be removed.

    Please never blindly copy foreign code, you should always double-check it.

    \
     
     \ /
      Last update: 2020-09-30 17:15    [W:4.379 / U:0.008 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site