Input: gpio-keys - optimize interrupt handler

By passing a gpio_button_data structure to the handler instead of the
whole platform_device the search for the right button can go away.
Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/keyboard/gpio_keys.c

@@ -56,29 +56,18 @@ static void gpio_check_button(unsigned long _data)
 
 static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
 {
-	struct platform_device *pdev = dev_id;
-	struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
-	struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);
-	int i;
+	struct gpio_button_data *bdata = dev_id;
+	struct gpio_keys_button *button = bdata->button;
 
-	for (i = 0; i < pdata->nbuttons; i++) {
-		struct gpio_keys_button *button = &pdata->buttons[i];
+	BUG_ON(irq != gpio_to_irq(button->gpio));
 
-		if (irq == gpio_to_irq(button->gpio)) {
-			struct gpio_button_data *bdata = &ddata->data[i];
-
-			if (button->debounce_interval)
-				mod_timer(&bdata->timer,
-					  jiffies +
-					  msecs_to_jiffies(button->debounce_interval));
-			else
-				gpio_keys_report_event(button, bdata->input);
-
-			return IRQ_HANDLED;
-		}
-	}
+	if (button->debounce_interval)
+		mod_timer(&bdata->timer,
+			jiffies + msecs_to_jiffies(button->debounce_interval));
+	else
+		gpio_keys_report_event(button, bdata->input);
 
-	return IRQ_NONE;
+	return IRQ_HANDLED;
 }
 
 static int __devinit gpio_keys_probe(struct platform_device *pdev)
@@ -151,7 +140,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
 				    IRQF_SAMPLE_RANDOM | IRQF_TRIGGER_RISING |
 					IRQF_TRIGGER_FALLING,
 				    button->desc ? button->desc : "gpio_keys",
-				    pdev);
+				    bdata);
 		if (error) {
 			pr_err("gpio-keys: Unable to claim irq %d; error %d\n",
 				irq, error);
@@ -178,7 +167,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
 
  fail2:
 	while (--i >= 0) {
-		free_irq(gpio_to_irq(pdata->buttons[i].gpio), 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);
 		gpio_free(pdata->buttons[i].gpio);
@@ -203,7 +192,7 @@ static int __devexit gpio_keys_remove(struct platform_device *pdev)
 
 	for (i = 0; i < pdata->nbuttons; i++) {
 		int irq = gpio_to_irq(pdata->buttons[i].gpio);
-		free_irq(irq, pdev);
+		free_irq(irq, &ddata->data[i]);
 		if (pdata->buttons[i].debounce_interval)
 			del_timer_sync(&ddata->data[i].timer);
 		gpio_free(pdata->buttons[i].gpio);