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

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
This commit is contained in:
Noralf Trønnes 2019-02-25 15:42:26 +01:00
parent a7db690c06
commit 56be6503aa
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/drm_drv.c
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@ -521,7 +521,7 @@ int drm_dev_init(struct drm_device *dev,
BUG_ON(!parent);
kref_init(&dev->ref);
dev->dev = parent;
dev->dev = get_device(parent);
dev->driver = driver;
/* no per-device feature limits by default */
@ -591,6 +591,7 @@ err_minors:
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);
@ -626,6 +627,8 @@ 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);