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drm: introduce drm_dev_free() to fix error paths

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The error paths in DRM bus drivers currently leak memory as they don't
correctly revert drm_dev_alloc(). Introduce drm_dev_free() to free DRM
devices which haven't been registered, yet.

We must be careful not to introduce any side-effects with cleanups done in
drm_dev_free(). drm_ht_remove(), drm_ctxbitmap_cleanup() and
drm_gem_destroy() are all fine in that regard.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
David Herrmann 2013-10-02 11:23:37 +02:00 committed by Dave Airlie
parent 1c8887dd01
commit 0dc8fe5985
5 changed files with 29 additions and 13 deletions
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2
drivers/gpu/drm/drm_pci.c
View file

@ -354,7 +354,7 @@ int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
err_pci:
pci_disable_device(pdev);
err_free:
kfree(dev);
drm_dev_free(dev);
return ret;
}
EXPORT_SYMBOL(drm_get_pci_dev);

2
drivers/gpu/drm/drm_platform.c
View file

@ -64,7 +64,7 @@ static int drm_get_platform_dev(struct platform_device *platdev,
return 0;
err_free:
kfree(dev);
drm_dev_free(dev);
return ret;
}

35
drivers/gpu/drm/drm_stub.c
View file

@ -363,7 +363,6 @@ static void drm_unplug_minor(struct drm_minor *minor)
*/
void drm_put_dev(struct drm_device *dev)
{
struct drm_driver *driver;
struct drm_map_list *r_list, *list_temp;
DRM_DEBUG("\n");
@ -372,7 +371,6 @@ void drm_put_dev(struct drm_device *dev)
DRM_ERROR("cleanup called no dev\n");
return;
}
driver = dev->driver;
drm_lastclose(dev);
@ -386,9 +384,6 @@ void drm_put_dev(struct drm_device *dev)
list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
drm_rmmap(dev, r_list->map);
drm_ht_remove(&dev->map_hash);
drm_ctxbitmap_cleanup(dev);
if (drm_core_check_feature(dev, DRIVER_MODESET))
drm_put_minor(&dev->control);
@ -396,14 +391,11 @@ void drm_put_dev(struct drm_device *dev)
if (dev->render)
drm_put_minor(&dev->render);
if (driver->driver_features & DRIVER_GEM)
drm_gem_destroy(dev);
drm_put_minor(&dev->primary);
list_del(&dev->driver_item);
kfree(dev->devname);
kfree(dev);
drm_dev_free(dev);
}
EXPORT_SYMBOL(drm_put_dev);
@ -501,6 +493,29 @@ struct drm_device *drm_dev_alloc(struct drm_driver *driver,
}
EXPORT_SYMBOL(drm_dev_alloc);
/**
* drm_dev_free - Free DRM device
* @dev: DRM device to free
*
* Free a DRM device that has previously been allocated via drm_dev_alloc().
* You must not use kfree() instead or you will leak memory.
*
* This must not be called once the device got registered. Use drm_put_dev()
* instead, which then calls drm_dev_free().
*/
void drm_dev_free(struct drm_device *dev)
{
if (dev->driver->driver_features & DRIVER_GEM)
drm_gem_destroy(dev);
drm_ctxbitmap_cleanup(dev);
drm_ht_remove(&dev->map_hash);
kfree(dev->devname);
kfree(dev);
}
EXPORT_SYMBOL(drm_dev_free);
/**
* drm_dev_register - Register DRM device
* @dev: Device to register

2
drivers/gpu/drm/drm_usb.c
View file

@ -29,7 +29,7 @@ int drm_get_usb_dev(struct usb_interface *interface,
return 0;
err_free:
kfree(dev);
drm_dev_free(dev);
return ret;
}

1
include/drm/drmP.h
View file

@ -1642,6 +1642,7 @@ static __inline__ void drm_core_dropmap(struct drm_local_map *map)
struct drm_device *drm_dev_alloc(struct drm_driver *driver,
struct device *parent);
void drm_dev_free(struct drm_device *dev);
int drm_dev_register(struct drm_device *dev, unsigned long flags);
int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int type);
/*@}*/