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drm/rockchip: only call drm_fb_helper_hotplug_event if fb_helper present
Add a check for the presence of fb_helper to rockchip_drm_output_poll_changed() to only call drm_fb_helper_hotplug_event if there is actually a fb_helper available. Without this check I see NULL pointer dereferences when the hdmi hotplug irq fires before the fb_helper got initialized. Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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1 changed files with 2 additions and 1 deletions
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@ -162,7 +162,8 @@ static void rockchip_drm_output_poll_changed(struct drm_device *dev)
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struct rockchip_drm_private *private = dev->dev_private;
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struct drm_fb_helper *fb_helper = &private->fbdev_helper;
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drm_fb_helper_hotplug_event(fb_helper);
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if (fb_helper)
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drm_fb_helper_hotplug_event(fb_helper);
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}
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static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
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