From a39a357c6ca3c88ad64e9b51bd7607c06cd6d35d Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Tue, 25 Aug 2015 15:45:11 +0200 Subject: [PATCH] drm: Make drm_fb_unregister/remove accept NULL fb These functions are used by drivers to release fbdev emulation buffers. We need to make them resilient to NULL pointers to make the fbdev compile/runtime knobs not cause Oopses on module unload. Cc: Archit Taneja Reviewed-by: Rob Clark Signed-off-by: Daniel Vetter --- drivers/gpu/drm/drm_crtc.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 33d877c65ced..884690c81094 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -538,7 +538,12 @@ EXPORT_SYMBOL(drm_framebuffer_reference); */ void drm_framebuffer_unregister_private(struct drm_framebuffer *fb) { - struct drm_device *dev = fb->dev; + struct drm_device *dev; + + if (!fb) + return; + + dev = fb->dev; mutex_lock(&dev->mode_config.fb_lock); /* Mark fb as reaped and drop idr ref. */ @@ -589,12 +594,17 @@ EXPORT_SYMBOL(drm_framebuffer_cleanup); */ void drm_framebuffer_remove(struct drm_framebuffer *fb) { - struct drm_device *dev = fb->dev; + struct drm_device *dev; struct drm_crtc *crtc; struct drm_plane *plane; struct drm_mode_set set; int ret; + if (!fb) + return; + + dev = fb->dev; + WARN_ON(!list_empty(&fb->filp_head)); /* -- 2.20.1