drm_mode_config_cleanup is idempotent, so no harm in calling this
twice. This allows us to gradually switch drivers over by removing
explicit drm_mode_config_cleanup calls.
With this step it's not also possible that (at least for simple
drivers) automatic resource cleanup can be done correctly without a
drm_driver->release hook. Therefore allow this now in
devm_drm_dev_init().
Also with drmm_ explicit drm_driver->release hooks are kinda not the
best option, so deprecate that hook to discourage future users.
v2: Fixup the example in the kerneldoc too.
Cc: "Noralf Trønnes" <noralf@xxxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
---
drivers/gpu/drm/drm_drv.c | 21 +++++----------------
drivers/gpu/drm/drm_mode_config.c | 12 +++++++++++-
include/drm/drm_mode_config.h | 2 +-
3 files changed, 17 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 3cf40864d4a6..428c569aaaf1 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -267,8 +267,7 @@ void drm_minor_release(struct drm_minor *minor)
*
* The following example shows a typical structure of a DRM display driver.
* The example focus on the probe() function and the other functions that is
- * almost always present and serves as a demonstration of devm_drm_dev_init()
- * usage with its accompanying drm_driver->release callback.
+ * almost always present and serves as a demonstration of devm_drm_dev_init().
*
* .. code-block:: c
*
@@ -278,16 +277,8 @@ void drm_minor_release(struct drm_minor *minor)
* struct clk *pclk;
* };
*
- * static void driver_drm_release(struct drm_device *drm)
- * {
- * struct driver_device *priv = container_of(...);
- *
- * drm_mode_config_cleanup(drm);
- * }
- *
* static struct drm_driver driver_drm_driver = {
* [...]
- * .release = driver_drm_release,
* };
*
* static int driver_probe(struct platform_device *pdev)
@@ -312,7 +303,9 @@ void drm_minor_release(struct drm_minor *minor)
* }
* drmm_add_final_kfree(drm, priv);
*
- * drm_mode_config_init(drm);
+ * ret = drm_mode_config_init(drm);
+ * if (ret)
+ * return ret;
*
* priv->userspace_facing = drmm_kzalloc(..., GFP_KERNEL);
* if (!priv->userspace_facing)
@@ -710,8 +703,7 @@ static void devm_drm_dev_init_release(void *data)
* @driver: DRM driver
*
* Managed drm_dev_init(). The DRM device initialized with this function is
- * automatically put on driver detach using drm_dev_put(). You must supply a
- * &drm_driver.release callback to control the finalization explicitly.
+ * automatically put on driver detach using drm_dev_put().
*
* RETURNS:
* 0 on success, or error code on failure.
@@ -722,9 +714,6 @@ int devm_drm_dev_init(struct device *parent,
{
int ret;
- if (WARN_ON(!driver->release))
- return -EINVAL;
-
ret = drm_dev_init(dev, driver, parent);
if (ret)
return ret;
diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index 08e6eff6a179..957db1edba0c 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -25,6 +25,7 @@
#include <drm/drm_drv.h>
#include <drm/drm_encoder.h>
#include <drm/drm_file.h>
+#include <drm/drm_managed.h>
#include <drm/drm_mode_config.h>
#include <drm/drm_print.h>
#include <linux/dma-resv.h>
@@ -373,6 +374,11 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
return 0;
}
+static void drm_mode_config_init_release(struct drm_device *dev, void *ptr)
+{
+ drm_mode_config_cleanup(dev);
+}
+
/**
* drm_mode_config_init - initialize DRM mode_configuration structure
* @dev: DRM device
@@ -384,8 +390,10 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
* problem, since this should happen single threaded at init time. It is the
* driver's problem to ensure this guarantee.
*
+ * Cleanup is automatically handled through registering drm_mode_config_cleanup
+ * with drmm_add_action().
*/
-void drm_mode_config_init(struct drm_device *dev)
+int drm_mode_config_init(struct drm_device *dev)
{
mutex_init(&dev->mode_config.mutex);
drm_modeset_lock_init(&dev->mode_config.connection_mutex);
@@ -443,6 +451,8 @@ void drm_mode_config_init(struct drm_device *dev)
drm_modeset_acquire_fini(&modeset_ctx);
dma_resv_fini(&resv);
}
+
+ return drmm_add_action(dev, drm_mode_config_init_release, NULL);
}
EXPORT_SYMBOL(drm_mode_config_init);
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 3bcbe30339f0..160a3e4b51c3 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -929,7 +929,7 @@ struct drm_mode_config {
const struct drm_mode_config_helper_funcs *helper_private;
};
-void drm_mode_config_init(struct drm_device *dev);
+int drm_mode_config_init(struct drm_device *dev);
void drm_mode_config_reset(struct drm_device *dev);
void drm_mode_config_cleanup(struct drm_device *dev);
--
2.24.1
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