drm: bridge: dw-hdmi: Don't forward HPD events to DRM core before attach

Hotplug events should only be forwarded to the DRM core by the interrupt
handler when the bridge has been attached, otherwise the DRM device
pointer will be NULL, resulting in a crash.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170117082910.27023-7-laurent.pinchart+renesas@ideasonboard.com

diff --git a/drivers/gpu/drm/bridge/dw-hdmi.c b/drivers/gpu/drm/bridge/dw-hdmi.c
index ef10bb866b2fae0b6a5c4ce2561f419dc7b3f5d2..488dc1a9204f33294b9ad54aec19598fa9aaaf72 100644 (file)
--- a/drivers/gpu/drm/bridge/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/dw-hdmi.c
@@ -1805,7 +1805,8 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
        if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
                dev_dbg(hdmi->dev, "EVENT=%s\n",
                        phy_int_pol & HDMI_PHY_HPD ? "plugin" : "plugout");
-               drm_helper_hpd_irq_event(hdmi->bridge.dev);
+               if (hdmi->bridge.dev)
+                       drm_helper_hpd_irq_event(hdmi->bridge.dev);
        }
 
        hdmi_writeb(hdmi, intr_stat, HDMI_IH_PHY_STAT0);