gpio: ws16c48: Use devm_request_region

By the time request_region is called in the WinSystems WS16C48 GPIO
driver, a corresponding device structure has already been allocated. The
devm_request_region function should be used to help simplify the cleanup
code and reduce the possible points of failure.

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

diff --git a/drivers/gpio/gpio-ws16c48.c b/drivers/gpio/gpio-ws16c48.c
index d5279a0a85bd2223b8b543192d0720b8768bcb58..51f41e8fd21e88e24bd126739ae1281a5a22dc2a 100644 (file)
--- a/drivers/gpio/gpio-ws16c48.c
+++ b/drivers/gpio/gpio-ws16c48.c
@@ -41,7 +41,6 @@ MODULE_PARM_DESC(ws16c48_irq, "WinSystems WS16C48 interrupt line number");
  * @irq_mask:  I/O bits affected by interrupts
  * @flow_mask: IRQ flow type mask for the respective I/O bits
  * @base:      base port address of the GPIO device
- * @extent:    extent of port address region of the GPIO device
  * @irq:       Interrupt line number
  */
 struct ws16c48_gpio {
@@ -52,7 +51,6 @@ struct ws16c48_gpio {
        unsigned long irq_mask;
        unsigned long flow_mask;
        unsigned base;
-       unsigned extent;
        unsigned irq;
 };
 
@@ -314,11 +312,10 @@ static int __init ws16c48_probe(struct platform_device *pdev)
        if (!ws16c48gpio)
                return -ENOMEM;
 
-       if (!request_region(base, extent, name)) {
-               dev_err(dev, "Unable to lock %s port addresses (0x%X-0x%X)\n",
-                       name, base, base + extent);
-               err = -EBUSY;
-               goto err_lock_io_port;
+       if (!devm_request_region(dev, base, extent, name)) {
+               dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
+                       base, base + extent);
+               return -EBUSY;
        }
 
        ws16c48gpio->chip.label = name;
@@ -332,7 +329,6 @@ static int __init ws16c48_probe(struct platform_device *pdev)
        ws16c48gpio->chip.get = ws16c48_gpio_get;
        ws16c48gpio->chip.set = ws16c48_gpio_set;
        ws16c48gpio->base = base;
-       ws16c48gpio->extent = extent;
        ws16c48gpio->irq = irq;
 
        spin_lock_init(&ws16c48gpio->lock);
@@ -342,7 +338,7 @@ static int __init ws16c48_probe(struct platform_device *pdev)
        err = gpiochip_add_data(&ws16c48gpio->chip, ws16c48gpio);
        if (err) {
                dev_err(dev, "GPIO registering failed (%d)\n", err);
-               goto err_gpio_register;
+               return err;
        }
 
        /* Disable IRQ by default */
@@ -356,24 +352,20 @@ static int __init ws16c48_probe(struct platform_device *pdev)
                handle_edge_irq, IRQ_TYPE_NONE);
        if (err) {
                dev_err(dev, "Could not add irqchip (%d)\n", err);
-               goto err_gpiochip_irqchip_add;
+               goto err_gpiochip_remove;
        }
 
        err = request_irq(irq, ws16c48_irq_handler, IRQF_SHARED, name,
                ws16c48gpio);
        if (err) {
                dev_err(dev, "IRQ handler registering failed (%d)\n", err);
-               goto err_request_irq;
+               goto err_gpiochip_remove;
        }
 
        return 0;
 
-err_request_irq:
-err_gpiochip_irqchip_add:
+err_gpiochip_remove:
        gpiochip_remove(&ws16c48gpio->chip);
-err_gpio_register:
-       release_region(base, extent);
-err_lock_io_port:
        return err;
 }
 
@@ -383,7 +375,6 @@ static int ws16c48_remove(struct platform_device *pdev)
 
        free_irq(ws16c48gpio->irq, ws16c48gpio);
        gpiochip_remove(&ws16c48gpio->chip);
-       release_region(ws16c48gpio->base, ws16c48gpio->extent);
 
        return 0;
 }