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drm/tegra: Store parent pointer in Tegra DRM clients

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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>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
This commit is contained in:
Thierry Reding
2019-02-01 14:28:31 +01:00
parent e1f338c0f8
commit 8e5d19c625
2 changed files with 3 additions and 0 deletions
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2
drivers/gpu/drm/tegra/drm.c
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@@ -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;