gpio: 104-idi-48: Utilize devm_ functions in driver probe callback

The devm_ resource manager functions allow memory to be automatically
released when a device is unbound. This patch takes advantage of the
resource manager functions and replaces the gpiochip_add_data call and
request_irq call with the devm_gpiochip_add_data call and
devm_request_irq call respectively. In addition, the idi_48_remove
function has been removed as no longer necessary due to the use of the
relevant devm_ resource manager functions.

Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-104-idi-48.c b/drivers/gpio/gpio-104-idi-48.c
index 2d2763e..eafbf05 100644 (file)
--- a/drivers/gpio/gpio-104-idi-48.c
+++ b/drivers/gpio/gpio-104-idi-48.c
@@ -47,7 +47,6 @@ MODULE_PARM_DESC(irq, "ACCES 104-IDI-48 interrupt line numbers");
  * @ack_lock:  synchronization lock to prevent IRQ handler race conditions
  * @irq_mask:  input bits affected by interrupts
  * @base:      base port address of the GPIO device
- * @irq:       Interrupt line number
  * @cos_enb:   Change-Of-State IRQ enable boundaries mask
  */
 struct idi_48_gpio {
@@ -56,7 +55,6 @@ struct idi_48_gpio {
        spinlock_t ack_lock;
        unsigned char irq_mask[6];
        unsigned base;
-       unsigned irq;
        unsigned char cos_enb;
 };
 
@@ -244,14 +242,13 @@ static int idi_48_probe(struct device *dev, unsigned int id)
        idi48gpio->chip.direction_input = idi_48_gpio_direction_input;
        idi48gpio->chip.get = idi_48_gpio_get;
        idi48gpio->base = base[id];
-       idi48gpio->irq = irq[id];
 
        spin_lock_init(&idi48gpio->lock);
        spin_lock_init(&idi48gpio->ack_lock);
 
        dev_set_drvdata(dev, idi48gpio);
 
-       err = gpiochip_add_data(&idi48gpio->chip, idi48gpio);
+       err = devm_gpiochip_add_data(dev, &idi48gpio->chip, idi48gpio);
        if (err) {
                dev_err(dev, "GPIO registering failed (%d)\n", err);
                return err;
@@ -265,30 +262,16 @@ static int idi_48_probe(struct device *dev, unsigned int id)
                handle_edge_irq, IRQ_TYPE_NONE);
        if (err) {
                dev_err(dev, "Could not add irqchip (%d)\n", err);
-               goto err_gpiochip_remove;
+               return err;
        }
 
-       err = request_irq(irq[id], idi_48_irq_handler, IRQF_SHARED, name,
-               idi48gpio);
+       err = devm_request_irq(dev, irq[id], idi_48_irq_handler, IRQF_SHARED,
+               name, idi48gpio);
        if (err) {
                dev_err(dev, "IRQ handler registering failed (%d)\n", err);
-               goto err_gpiochip_remove;
+               return err;
        }
 
-       return 0;
-
-err_gpiochip_remove:
-       gpiochip_remove(&idi48gpio->chip);
-       return err;
-}
-
-static int idi_48_remove(struct device *dev, unsigned int id)
-{
-       struct idi_48_gpio *const idi48gpio = dev_get_drvdata(dev);
-
-       free_irq(idi48gpio->irq, idi48gpio);
-       gpiochip_remove(&idi48gpio->chip);
-
        return 0;
 }
 
@@ -297,7 +280,6 @@ static struct isa_driver idi_48_driver = {
        .driver = {
                .name = "104-idi-48"
        },
-       .remove = idi_48_remove
 };
 module_isa_driver(idi_48_driver, num_idi_48);