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drm/tegra: dc: Balance IOMMU group refcounting 

Remove unneeded iommu_group_get() and add missing iommu_group_put(),
correcting IOMMU group refcount. This is a minor correction / cleanup that
doesn't really fix anything because Tegra's IOMMU driver are built-in and
hence groups refcounting can't hold IOMMU driver from unloading.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2018-05-04 02:47:19 +03:00 committed by Thierry Reding
parent b1a3dc0b85
commit 6f75b16b26
2 changed files with 16 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/gpu/drm/tegra/dc.c
View File

@ -1826,7 +1826,6 @@ static irqreturn_t tegra_dc_irq(int irq, void *data)
static int tegra_dc_init(struct host1x_client *client)
{
struct drm_device *drm = dev_get_drvdata(client->parent);
struct iommu_group *group = iommu_group_get(client->dev);
unsigned long flags = HOST1X_SYNCPT_CLIENT_MANAGED;
struct tegra_dc *dc = host1x_client_to_dc(client);
struct tegra_drm *tegra = drm->dev_private;
@ -1838,20 +1837,21 @@ static int tegra_dc_init(struct host1x_client *client)
if (!dc->syncpt)
dev_warn(dc->dev, "failed to allocate syncpoint\n");
if (group && tegra->domain) {
if (group != tegra->group) {
err = iommu_attach_group(tegra->domain, group);
if (tegra->domain) {
dc->group = iommu_group_get(client->dev);
if (dc->group && dc->group != tegra->group) {
err = iommu_attach_group(tegra->domain, dc->group);
if (err < 0) {
dev_err(dc->dev,
"failed to attach to domain: %d\n",
err);
iommu_group_put(dc->group);
return err;
}
tegra->group = group;
tegra->group = dc->group;
}
dc->domain = tegra->domain;
}
if (dc->soc->wgrps)
@ -1916,13 +1916,13 @@ static int tegra_dc_init(struct host1x_client *client)
if (!IS_ERR(primary))
drm_plane_cleanup(primary);
if (group && dc->domain) {
if (group == tegra->group) {
iommu_detach_group(dc->domain, group);
if (dc->group) {
if (dc->group == tegra->group) {
iommu_detach_group(tegra->domain, dc->group);
tegra->group = NULL;
}
dc->domain = NULL;
iommu_group_put(dc->group);
}
return err;
@ -1931,7 +1931,6 @@ static int tegra_dc_init(struct host1x_client *client)
static int tegra_dc_exit(struct host1x_client *client)
{
struct drm_device *drm = dev_get_drvdata(client->parent);
struct iommu_group *group = iommu_group_get(client->dev);
struct tegra_dc *dc = host1x_client_to_dc(client);
struct tegra_drm *tegra = drm->dev_private;
int err;
@ -1944,13 +1943,13 @@ static int tegra_dc_exit(struct host1x_client *client)
return err;
}
if (group && dc->domain) {
if (group == tegra->group) {
iommu_detach_group(dc->domain, group);
if (dc->group) {
if (dc->group == tegra->group) {
iommu_detach_group(tegra->domain, dc->group);
tegra->group = NULL;
}
dc->domain = NULL;
iommu_group_put(dc->group);
}
host1x_syncpt_free(dc->syncpt);

2
drivers/gpu/drm/tegra/dc.h
View File

@ -92,7 +92,7 @@ struct tegra_dc {
const struct tegra_dc_soc_info *soc;
struct iommu_domain *domain;
struct iommu_group *group;
};
static inline struct tegra_dc *