diff mbox

[v3,06/20] drm: bridge: dw-hdmi: Don't forward HPD events to DRM core before attach

Message ID 20170117082910.27023-7-laurent.pinchart+renesas@ideasonboard.com (mailing list archive)
State Accepted
Delegated to: Geert Uytterhoeven
Headers show

Commit Message

Laurent Pinchart Jan. 17, 2017, 8:28 a.m. UTC 
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>
---
 drivers/gpu/drm/bridge/dw-hdmi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/drivers/gpu/drm/bridge/dw-hdmi.c b/drivers/gpu/drm/bridge/dw-hdmi.c
index ef10bb866b2f..488dc1a9204f 100644
--- 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);