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    Subject[PATCH 5.4 35/43] drm/nouveau/tegra: Stop using iommu_present()
    Date
    From: Robin Murphy <robin.murphy@arm.com>

    commit 87fd2b091fb33871a7f812658a0971e8e26f903f upstream.

    Even if some IOMMU has registered itself on the platform "bus", that
    doesn't necessarily mean it provides translation for the device we
    care about. Replace iommu_present() with a more appropriate check.

    Signed-off-by: Robin Murphy <robin.murphy@arm.com>
    Reviewed-by: Lyude Paul <lyude@redhat.com>
    [added cc for stable]
    Signed-off-by: Lyude Paul <lyude@redhat.com>
    Cc: stable@vger.kernel.org # v5.0+
    Link: https://patchwork.freedesktop.org/patch/msgid/70d40ea441da3663c2824d54102b471e9a621f8a.1649168494.git.robin.murphy@arm.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
    +++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
    @@ -123,7 +123,7 @@ nvkm_device_tegra_probe_iommu(struct nvk

    mutex_init(&tdev->iommu.mutex);

    - if (iommu_present(&platform_bus_type)) {
    + if (device_iommu_mapped(dev)) {
    tdev->iommu.domain = iommu_domain_alloc(&platform_bus_type);
    if (!tdev->iommu.domain)
    goto error;

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