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drm/drv: Hold ref on parent device during drm_device lifetime

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[ Upstream commit 56be6503aab2bc3a30beae408071b9be5e1bae51 ]

This makes it safe to access drm_device->dev after the parent device has
been removed/unplugged.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190225144232.20761-2-noralf@tronnes.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Noralf Trønnes 2019-02-25 15:42:26 +01:00 committed by Greg Kroah-Hartman
parent 473bc1af7a
commit d6dea92a48
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/drm_drv.c
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@ -499,7 +499,7 @@ int drm_dev_init(struct drm_device *dev,
}
kref_init(&dev->ref);
dev->dev = parent;
dev->dev = get_device(parent);
dev->driver = driver;
INIT_LIST_HEAD(&dev->filelist);
@ -568,6 +568,7 @@ int drm_dev_init(struct drm_device *dev,
drm_minor_free(dev, DRM_MINOR_RENDER);
drm_fs_inode_free(dev->anon_inode);
err_free:
put_device(dev->dev);
mutex_destroy(&dev->master_mutex);
mutex_destroy(&dev->ctxlist_mutex);
mutex_destroy(&dev->clientlist_mutex);
@ -603,6 +604,8 @@ void drm_dev_fini(struct drm_device *dev)
drm_minor_free(dev, DRM_MINOR_PRIMARY);
drm_minor_free(dev, DRM_MINOR_RENDER);
put_device(dev->dev);
mutex_destroy(&dev->master_mutex);
mutex_destroy(&dev->ctxlist_mutex);
mutex_destroy(&dev->clientlist_mutex);