From 56be6503aab2bc3a30beae408071b9be5e1bae51 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Noralf=20Tr=C3=B8nnes?= Date: Mon, 25 Feb 2019 15:42:26 +0100 Subject: [PATCH] drm/drv: Hold ref on parent device during drm_device lifetime MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This makes it safe to access drm_device->dev after the parent device has been removed/unplugged. Signed-off-by: Noralf Trønnes Reviewed-by: Gerd Hoffmann Link: https://patchwork.freedesktop.org/patch/msgid/20190225144232.20761-2-noralf@tronnes.org --- drivers/gpu/drm/drm_drv.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 53e8f4e103db..ce65f12db0fe 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -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); -- 2.30.2