linux-kernel - [PATCH v2] ARM: OMAPFB: panel-sony-acx565akm: fix missing mutex unlocks

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Date:	Sun,  5 Jan 2014 15:13:05 +0200
From:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
To:	tomi.valkeinen@...com
Cc:	plagnioj@...osoft.com, pali.rohar@...il.com, pavel@....cz,
	linux-omap@...r.kernel.org, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ivaylo Dimitrov <freemangordon@....bg>
Subject: [PATCH v2] ARM: OMAPFB: panel-sony-acx565akm: fix missing mutex unlocks

From: Ivaylo Dimitrov <freemangordon@....bg>

Commit c37dd677988ca50bc8bc60ab5ab053720583c168 fixes the unbalanced
unlock in acx565akm_enable but introduces another problem - if
acx565akm_panel_power_on exits early, the mutex is not unlocked. Fix
that by unlocking the mutex on early return. Also add mutex protection in
acx565akm_panel_power_off and remove an unused variable

Signed-off-by: Ivaylo Dimitrov <freemangordon@....bg>
---
 .../omap2/displays-new/panel-sony-acx565akm.c      |   16 ++++++++++------
 1 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/video/omap2/displays-new/panel-sony-acx565akm.c b/drivers/video/omap2/displays-new/panel-sony-acx565akm.c
index d94f35d..9aef7fa 100644
--- a/drivers/video/omap2/displays-new/panel-sony-acx565akm.c
+++ b/drivers/video/omap2/displays-new/panel-sony-acx565akm.c
@@ -535,6 +535,7 @@ static int acx565akm_panel_power_on(struct omap_dss_device *dssdev)
 
 	r = in->ops.sdi->enable(in);
 	if (r) {
+		mutex_unlock(&ddata->mutex);
 		pr_err("%s sdi enable failed\n", __func__);
 		return r;
 	}
@@ -546,6 +547,7 @@ static int acx565akm_panel_power_on(struct omap_dss_device *dssdev)
 		gpio_set_value(ddata->reset_gpio, 1);
 
 	if (ddata->enabled) {
+		mutex_unlock(&ddata->mutex);
 		dev_dbg(&ddata->spi->dev, "panel already enabled\n");
 		return 0;
 	}
@@ -578,10 +580,14 @@ static void acx565akm_panel_power_off(struct omap_dss_device *dssdev)
 	struct panel_drv_data *ddata = to_panel_data(dssdev);
 	struct omap_dss_device *in = ddata->in;
 
+	mutex_lock(&ddata->mutex);
+
 	dev_dbg(dssdev->dev, "%s\n", __func__);
 
-	if (!ddata->enabled)
+	if (!ddata->enabled) {
+		mutex_unlock(&ddata->mutex);
 		return;
+	}
 
 	set_display_state(ddata, 0);
 	set_sleep_mode(ddata, 1);
@@ -601,11 +607,13 @@ static void acx565akm_panel_power_off(struct omap_dss_device *dssdev)
 	msleep(100);
 
 	in->ops.sdi->disable(in);
+
+	mutex_unlock(&ddata->mutex);
+
 }
 
 static int acx565akm_enable(struct omap_dss_device *dssdev)
 {
-	struct panel_drv_data *ddata = to_panel_data(dssdev);
 	int r;
 
 	dev_dbg(dssdev->dev, "%s\n", __func__);
@@ -627,16 +635,12 @@ static int acx565akm_enable(struct omap_dss_device *dssdev)
 
 static void acx565akm_disable(struct omap_dss_device *dssdev)
 {
-	struct panel_drv_data *ddata = to_panel_data(dssdev);
-
 	dev_dbg(dssdev->dev, "%s\n", __func__);
 
 	if (!omapdss_device_is_enabled(dssdev))
 		return;
 
-	mutex_lock(&ddata->mutex);
 	acx565akm_panel_power_off(dssdev);
-	mutex_unlock(&ddata->mutex);
 
 	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 }
-- 
1.5.6.1

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