From: Daniel Mack <daniel@caiaq.de>
Date: Mon, 19 Apr 2010 07:42:16 +0000 (-0700)
Subject: Input: eeti_ts - cancel pending work when going to suspend
X-Git-Tag: firefly_0821_release~9833^2~2172^2~10
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7fbef0d1e278a0a8c803a4d2b1e2bd5740bffa52;p=firefly-linux-kernel-4.4.55.git

Input: eeti_ts - cancel pending work when going to suspend

This fixes a race between the suspend code and input events.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

diff --git a/drivers/input/touchscreen/eeti_ts.c b/drivers/input/touchscreen/eeti_ts.c
index 9029bd3f34e5..6fb6bd8495e7 100644
--- a/drivers/input/touchscreen/eeti_ts.c
+++ b/drivers/input/touchscreen/eeti_ts.c
@@ -123,14 +123,25 @@ static irqreturn_t eeti_ts_isr(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static int eeti_ts_open(struct input_dev *dev)
+static void eeti_ts_start(struct eeti_ts_priv *priv)
 {
-	struct eeti_ts_priv *priv = input_get_drvdata(dev);
-
 	enable_irq(priv->irq);
 
 	/* Read the events once to arm the IRQ */
 	eeti_ts_read(&priv->work);
+}
+
+static void eeti_ts_stop(struct eeti_ts_priv *priv)
+{
+	disable_irq(priv->irq);
+	cancel_work_sync(&priv->work);
+}
+
+static int eeti_ts_open(struct input_dev *dev)
+{
+	struct eeti_ts_priv *priv = input_get_drvdata(dev);
+
+	eeti_ts_start(priv);
 
 	return 0;
 }
@@ -139,8 +150,7 @@ static void eeti_ts_close(struct input_dev *dev)
 {
 	struct eeti_ts_priv *priv = input_get_drvdata(dev);
 
-	disable_irq(priv->irq);
-	cancel_work_sync(&priv->work);
+	eeti_ts_stop(priv);
 }
 
 static int __devinit eeti_ts_probe(struct i2c_client *client,
@@ -152,10 +162,12 @@ static int __devinit eeti_ts_probe(struct i2c_client *client,
 	unsigned int irq_flags;
 	int err = -ENOMEM;
 
-	/* In contrast to what's described in the datasheet, there seems
+	/*
+	 * In contrast to what's described in the datasheet, there seems
 	 * to be no way of probing the presence of that device using I2C
 	 * commands. So we need to blindly believe it is there, and wait
-	 * for interrupts to occur. */
+	 * for interrupts to occur.
+	 */
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv) {
@@ -211,9 +223,11 @@ static int __devinit eeti_ts_probe(struct i2c_client *client,
 		goto err2;
 	}
 
-	/* Disable the irq for now. It will be enabled once the input device
-	 * is opened. */
-	disable_irq(priv->irq);
+	/*
+	 * Disable the device for now. It will be enabled once the
+	 * input device is opened.
+	 */
+	eeti_ts_stop(priv);
 
 	device_init_wakeup(&client->dev, 0);
 	return 0;
@@ -234,6 +248,12 @@ static int __devexit eeti_ts_remove(struct i2c_client *client)
 	struct eeti_ts_priv *priv = i2c_get_clientdata(client);
 
 	free_irq(priv->irq, priv);
+	/*
+	 * eeti_ts_stop() leaves IRQ disabled. We need to re-enable it
+	 * so that device still works if we reload the driver.
+	 */
+	enable_irq(priv->irq);
+
 	input_unregister_device(priv->input);
 	i2c_set_clientdata(client, NULL);
 	kfree(priv);
@@ -245,6 +265,14 @@ static int __devexit eeti_ts_remove(struct i2c_client *client)
 static int eeti_ts_suspend(struct i2c_client *client, pm_message_t mesg)
 {
 	struct eeti_ts_priv *priv = i2c_get_clientdata(client);
+	struct input_dev *input_dev = priv->input;
+
+	mutex_lock(&input_dev->mutex);
+
+	if (input_dev->users)
+		eeti_ts_stop(priv);
+
+	mutex_unlock(&input_dev->mutex);
 
 	if (device_may_wakeup(&client->dev))
 		enable_irq_wake(priv->irq);
@@ -255,10 +283,18 @@ static int eeti_ts_suspend(struct i2c_client *client, pm_message_t mesg)
 static int eeti_ts_resume(struct i2c_client *client)
 {
 	struct eeti_ts_priv *priv = i2c_get_clientdata(client);
+	struct input_dev *input_dev = priv->input;
 
 	if (device_may_wakeup(&client->dev))
 		disable_irq_wake(priv->irq);
 
+	mutex_lock(&input_dev->mutex);
+
+	if (input_dev->users)
+		eeti_ts_start(priv);
+
+	mutex_unlock(&input_dev->mutex);
+
 	return 0;
 }
 #else