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drm/rockchip: only call drm_fb_helper_hotplug_event if fb_helper present

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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>
This commit is contained in:
Heiko Stübner 2015-06-02 16:41:45 +02:00 committed by Mark Yao
parent 85a359f253
commit 765c35bbd2
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/rockchip/rockchip_drm_fb.c
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@ -162,7 +162,8 @@ static void rockchip_drm_output_poll_changed(struct drm_device *dev)
struct rockchip_drm_private *private = dev->dev_private; struct rockchip_drm_private *private = dev->dev_private;
struct drm_fb_helper *fb_helper = &private->fbdev_helper; struct drm_fb_helper *fb_helper = &private->fbdev_helper;
drm_fb_helper_hotplug_event(fb_helper); if (fb_helper)
drm_fb_helper_hotplug_event(fb_helper);
} }
static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = { static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {