Input: gpio-keys - avoid possibility of sleeping in timer function

The gpio_get_value function may sleep, so it should not be called in a
timer function. Move gpio_get_value calls to workqueue.

Signed-off-by: Jani Nikula <ext-jani.1.nikula@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 9767213b6c8f..efed0c9e242e 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -22,6 +22,7 @@
 #include <linux/platform_device.h>
 #include <linux/input.h>
 #include <linux/gpio_keys.h>
+#include <linux/workqueue.h>
 
 #include <asm/gpio.h>
 
@@ -29,6 +30,7 @@ struct gpio_button_data {
         struct gpio_keys_button *button;
         struct input_dev *input;
         struct timer_list timer;
+        struct work_struct work;
 };
 
 struct gpio_keys_drvdata {
@@ -36,8 +38,10 @@ struct gpio_keys_drvdata {
         struct gpio_button_data data[0];
 };
 
-static void gpio_keys_report_event(struct gpio_button_data *bdata)
+static void gpio_keys_report_event(struct work_struct *work)
 {
+        struct gpio_button_data *bdata =
+                container_of(work, struct gpio_button_data, work);
         struct gpio_keys_button *button = bdata->button;
         struct input_dev *input = bdata->input;
         unsigned int type = button->type ?: EV_KEY;
@@ -47,11 +51,11 @@ static void gpio_keys_report_event(struct gpio_button_data *bdata)
         input_sync(input);
 }
 
-static void gpio_check_button(unsigned long _data)
+static void gpio_keys_timer(unsigned long _data)
 {
         struct gpio_button_data *data = (struct gpio_button_data *)_data;
 
-        gpio_keys_report_event(data);
+        schedule_work(&data->work);
 }
 
 static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
@@ -65,7 +69,7 @@ static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
                 mod_timer(&bdata->timer,
                         jiffies + msecs_to_jiffies(button->debounce_interval));
         else
-                gpio_keys_report_event(bdata);
+                schedule_work(&bdata->work);
 
         return IRQ_HANDLED;
 }
@@ -113,7 +117,8 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
                 bdata->input = input;
                 bdata->button = button;
                 setup_timer(&bdata->timer,
-                            gpio_check_button, (unsigned long)bdata);
+                            gpio_keys_timer, (unsigned long)bdata);
+                INIT_WORK(&bdata->work, gpio_keys_report_event);
 
                 error = gpio_request(button->gpio, button->desc ?: "gpio_keys");
                 if (error < 0) {
@@ -174,6 +179,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
                 free_irq(gpio_to_irq(pdata->buttons[i].gpio), &ddata->data[i]);
                 if (pdata->buttons[i].debounce_interval)
                         del_timer_sync(&ddata->data[i].timer);
+                cancel_work_sync(&ddata->data[i].work);
                 gpio_free(pdata->buttons[i].gpio);
         }
 
@@ -199,6 +205,7 @@ static int __devexit gpio_keys_remove(struct platform_device *pdev)
                 free_irq(irq, &ddata->data[i]);
                 if (pdata->buttons[i].debounce_interval)
                         del_timer_sync(&ddata->data[i].timer);
+                cancel_work_sync(&ddata->data[i].work);
                 gpio_free(pdata->buttons[i].gpio);
         }