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drm/nouveau/tegra: Stop using iommu_present()

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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>
This commit is contained in:
Robin Murphy 2022-04-05 15:21:34 +01:00 committed by Greg Kroah-Hartman
parent e06605af8b
commit 819796024c
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
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@ -123,7 +123,7 @@ nvkm_device_tegra_probe_iommu(struct nvkm_device_tegra *tdev)
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;