[PATCH v2 07/13] drm/tegra: Store parent pointer in Tegra DRM clients

Thierry Reding
2019-01-24T18:03:09Z

Tegra DRM clients need access to their parent, so store a pointer to it
upon registration. It's technically possible to get at this by going via
the host1x client's parent and getting the driver data, but that's quite
complicated and not very transparent. It's much more straightforward and
natural to let the children know about their parent.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
Changes in v2:
- clarify rationale in commit message

drivers/gpu/drm/tegra/drm.c | 2 ++
drivers/gpu/drm/tegra/drm.h | 1 +
2 files changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 4b70ce664c41..61dcbd218ffc 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -1041,6 +1041,7 @@ int tegra_drm_register_client(struct tegra_drm *tegra,
{
mutex_lock(&tegra->clients_lock);
list_add_tail(&client->list, &tegra->clients);
+ client->drm = tegra;
mutex_unlock(&tegra->clients_lock);

return 0;
@@ -1051,6 +1052,7 @@ int tegra_drm_unregister_client(struct tegra_drm *tegra,
{
mutex_lock(&tegra->clients_lock);
list_del_init(&client->list);
+ client->drm = NULL;
mutex_unlock(&tegra->clients_lock);

return 0;
diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index f1763b4d5b5f..2c809755bca7 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -88,6 +88,7 @@ int tegra_drm_submit(struct tegra_drm_context *context,
struct tegra_drm_client {
struct host1x_client base;
struct list_head list;
+ struct tegra_drm *drm;

unsigned int version;
const struct tegra_drm_client_ops *ops;