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iommu/mediatek: Fix M4Uv1 group refcounting
For each subsequent device assigned to the m4u_group after its initial allocation, we need to take an additional reference. Otherwise, the caller of iommu_group_get_for_dev() will inadvertently remove the reference taken by iommu_group_add_device(), and the group will be freed prematurely if any device is removed. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -502,6 +502,8 @@ static struct iommu_group *mtk_iommu_device_group(struct device *dev)
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data->m4u_group = iommu_group_alloc();
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if (IS_ERR(data->m4u_group))
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dev_err(dev, "Failed to allocate M4U IOMMU group\n");
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} else {
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iommu_group_ref_get(data->m4u_group);
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}
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return data->m4u_group;
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}
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