[PATCH 15/17] drm/tegra: Fix potential bug on driver unload

[Thierry Reding]

From: Thierry Reding <treding at nvidia.com>

The HDMI hotplug signal may toggle after the DRM driver has been
unloaded. Make sure not to call into DRM if that's the case.

Signed-off-by: Thierry Reding <treding at nvidia.com>
---
 drivers/gpu/drm/tegra/output.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/output.c b/drivers/gpu/drm/tegra/output.c
index 6b393cfbb5e7..def74914dd72 100644
--- a/drivers/gpu/drm/tegra/output.c
+++ b/drivers/gpu/drm/tegra/output.c
@@ -181,7 +181,8 @@ static irqreturn_t hpd_irq(int irq, void *data)
 {
 	struct tegra_output *output = data;
 
-	drm_helper_hpd_irq_event(output->connector.dev);
+	if (output->connector.dev)
+		drm_helper_hpd_irq_event(output->connector.dev);
 
 	return IRQ_HANDLED;
 }
-- 
2.1.2