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iommu/tegra-smmu: Prune IOMMU group when it is released

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In order to share groups between multiple devices we keep track of them
in a per-SMMU list. When an IOMMU group is released, a dangling pointer
to it stays around in that list. Fix this by implementing an IOMMU data
release callback for groups where the dangling pointer can be removed.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20200806155404.3936074-4-thierry.reding@gmail.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Thierry Reding 2020-08-06 17:54:04 +02:00 committed by Joerg Roedel
parent 5b30fbfa2a
commit 1ea5440e36
1 changed files with 13 additions and 0 deletions
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13
drivers/iommu/tegra-smmu.c
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@ -19,6 +19,7 @@
struct tegra_smmu_group {
struct list_head list;
struct tegra_smmu *smmu;
const struct tegra_smmu_group_soc *soc;
struct iommu_group *group;
};
@ -813,6 +814,16 @@ tegra_smmu_find_group(struct tegra_smmu *smmu, unsigned int swgroup)
return NULL;
}
static void tegra_smmu_group_release(void *iommu_data)
{
struct tegra_smmu_group *group = iommu_data;
struct tegra_smmu *smmu = group->smmu;
mutex_lock(&smmu->lock);
list_del(&group->list);
mutex_unlock(&smmu->lock);
}
static struct iommu_group *tegra_smmu_group_get(struct tegra_smmu *smmu,
unsigned int swgroup)
{
@ -840,6 +851,7 @@ static struct iommu_group *tegra_smmu_group_get(struct tegra_smmu *smmu,
}
INIT_LIST_HEAD(&group->list);
group->smmu = smmu;
group->soc = soc;
group->group = iommu_group_alloc();
@ -849,6 +861,7 @@ static struct iommu_group *tegra_smmu_group_get(struct tegra_smmu *smmu,
return NULL;
}
iommu_group_set_iommudata(group->group, group, tegra_smmu_group_release);
iommu_group_set_name(group->group, soc->name);
list_add_tail(&group->list, &smmu->groups);
mutex_unlock(&smmu->lock);