From: Thierry Reding <treding@nvidia.com>
Date: Fri, 3 Jul 2015 12:56:46 +0000 (+0200)
Subject: drm/tegra: dpaux: Disable interrupt when detached
X-Git-Tag: firefly_0821_release~176^2~1083^2~29^2~14
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9e532b3ad9a7fc5f00d29c766439ffbdcc403146;p=firefly-linux-kernel-4.4.55.git

drm/tegra: dpaux: Disable interrupt when detached

When the DPAUX isn't attached to an SOR the interrupts are not useful.
This also prevents a race that could potentially cause a crash on driver
removal.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---

diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c
index 909072d95077..224a7dc8e4ed 100644
--- a/drivers/gpu/drm/tegra/dpaux.c
+++ b/drivers/gpu/drm/tegra/dpaux.c
@@ -352,6 +352,8 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
 		return err;
 	}
 
+	disable_irq(dpaux->irq);
+
 	dpaux->aux.transfer = tegra_dpaux_transfer;
 	dpaux->aux.dev = &pdev->dev;
 
@@ -468,8 +470,10 @@ int tegra_dpaux_attach(struct tegra_dpaux *dpaux, struct tegra_output *output)
 		enum drm_connector_status status;
 
 		status = tegra_dpaux_detect(dpaux);
-		if (status == connector_status_connected)
+		if (status == connector_status_connected) {
+			enable_irq(dpaux->irq);
 			return 0;
+		}
 
 		usleep_range(1000, 2000);
 	}
@@ -482,6 +486,8 @@ int tegra_dpaux_detach(struct tegra_dpaux *dpaux)
 	unsigned long timeout;
 	int err;
 
+	disable_irq(dpaux->irq);
+
 	err = regulator_disable(dpaux->vdd);
 	if (err < 0)
 		return err;