Commit b02e6e04 authored Apr 13, 2023 by Mikko Perttunen Committed by Thierry Reding Jul 27, 2023

gpu: host1x: Return error when context device not attached to IOMMU



If a context device was not attached to IOMMU, we kept the old
success err value causing context devices to be unregistered but
success to be returned. This would mean that things would go on
but with context isolation disabled.

To decide on an explicit behavior, let's return an error code
here instead. If someone wants to go without IOMMU on a platform
modern enough to support context isolation, they can remove the
context devices from device tree.

Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230413082202.114721-2-cyndis@kapsi.fi

parent cf8d3223

drivers/gpu/host1x/context.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -79,6 +79,14 @@ int host1x_memory_context_list_init(struct host1x *host1x)
		!device_iommu_mapped(&ctx->dev)) {
		dev_err(host1x->dev, "Context device %d has no IOMMU!\n", i);
		device_unregister(&ctx->dev);

		/*
		* This means that if IOMMU is disabled but context devices
		* are defined in the device tree, Host1x will fail to probe.
		* That's probably OK in this time and age.
		*/
		err = -EINVAL;

		goto unreg_devices;
		}
		}