diff options
| -rw-r--r-- | drivers/gpu/drm/drm_fb_helper.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 3630d92c9738..329d08167b77 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -89,8 +89,9 @@ static LIST_HEAD(kernel_fb_helper_list); * connectors to the fbdev, e.g. if some are reserved for special purposes or * not adequate to be used for the fbcon. * - * Since this is part of the initial setup before the fbdev is published, no - * locking is required. + * This function is protected against concurrent connector hotadds/removals + * using drm_fb_helper_add_one_connector() and + * drm_fb_helper_remove_one_connector(). */ int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) { @@ -98,6 +99,7 @@ int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) struct drm_connector *connector; int i; + mutex_lock(&dev->mode_config.mutex); drm_for_each_connector(connector, dev) { struct drm_fb_helper_connector *fb_helper_connector; @@ -108,6 +110,7 @@ int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) fb_helper_connector->connector = connector; fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector; } + mutex_unlock(&dev->mode_config.mutex); return 0; fail: for (i = 0; i < fb_helper->connector_count; i++) { @@ -115,6 +118,8 @@ fail: fb_helper->connector_info[i] = NULL; } fb_helper->connector_count = 0; + mutex_unlock(&dev->mode_config.mutex); + return -ENOMEM; } EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors); |