[PATCH v5 2/7] drm/client: Do not acquire module reference

[Thomas Zimmermann]

Do not acquire a reference on the module that provides a client's
callback functions in drm_client_init(). The additional reference
prevents the user from unloading the callback functions' module and
thus creating dangling pointers.

This is only necessary if there is no direct dependency between the
caller of drm_client_init() and the provider of the callbacks in
struct drm_client_funcs. If this case ever existed, it has been
removed from the DRM code. Callers of drm_client_init() also provide
the callback implementation. The lifetime of the clients is tied to
the dependency chain's outer-most module, which is the hardware's
DRM driver. Before client helpers could be unloaded, the driver module
would have to be unloaded, which also unregisters all clients.

Driver modules that set up DRM clients can now be unloaded.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/drm_client.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index 2762572f286e7..b49f91b5d4b27 100644
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -5,7 +5,6 @@
 
 #include <linux/iosys-map.h>
 #include <linux/list.h>
-#include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
@@ -84,16 +83,13 @@ int drm_client_init(struct drm_device *dev, struct drm_client_dev *client,
 	if (!drm_core_check_feature(dev, DRIVER_MODESET) || !dev->driver->dumb_create)
 		return -EOPNOTSUPP;
 
-	if (funcs && !try_module_get(funcs->owner))
-		return -ENODEV;
-
 	client->dev = dev;
 	client->name = name;
 	client->funcs = funcs;
 
 	ret = drm_client_modeset_create(client);
 	if (ret)
-		goto err_put_module;
+		return ret;
 
 	ret = drm_client_open(client);
 	if (ret)
@@ -105,10 +101,6 @@ int drm_client_init(struct drm_device *dev, struct drm_client_dev *client,
 
 err_free:
 	drm_client_modeset_free(client);
-err_put_module:
-	if (funcs)
-		module_put(funcs->owner);
-
 	return ret;
 }
 EXPORT_SYMBOL(drm_client_init);
@@ -177,8 +169,6 @@ void drm_client_release(struct drm_client_dev *client)
 	drm_client_modeset_free(client);
 	drm_client_close(client);
 	drm_dev_put(dev);
-	if (client->funcs)
-		module_put(client->funcs->owner);
 }
 EXPORT_SYMBOL(drm_client_release);
 
-- 
2.42.0