drm: omapdrm: Add missing check for alloc_ordered_workqueue

commit e794b7b upstream.

As it may return NULL pointer and cause NULL pointer dereference. Add check
for the return value of alloc_ordered_workqueue.

Cc: [email protected]
Fixes: 2f95bc6 ("drm: omapdrm: Perform initialization/cleanup at probe/remove time")
Signed-off-by: Ma Ke <[email protected]>
Signed-off-by: Tomi Valkeinen <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Ma Ke

drivers/gpu/drm/omapdrm/omap_drv.c

@@ -695,6 +695,10 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
 	soc = soc_device_match(omapdrm_soc_devices);
 	priv->omaprev = soc ? (uintptr_t)soc->data : 0;
 	priv->wq = alloc_ordered_workqueue("omapdrm", 0);
+	if (!priv->wq) {
+		ret = -ENOMEM;
+		goto err_alloc_workqueue;
+	}
 
 	mutex_init(&priv->list_lock);
 	INIT_LIST_HEAD(&priv->obj_list);
@@ -753,6 +757,7 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
 	drm_mode_config_cleanup(ddev);
 	omap_gem_deinit(ddev);
 	destroy_workqueue(priv->wq);
+err_alloc_workqueue:
 	omap_disconnect_pipelines(ddev);
 	drm_dev_put(ddev);
 	return ret;