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gpio: 104-dio-48e: Use devm_request_region

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By the time request_region is called in the ACCES 104-DIO-48E 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>
This commit is contained in:
William Breathitt Gray 2016-02-03 15:15:21 -05:00 committed by Linus Walleij
parent 22aeddb58d
commit aa6c360226
1 changed files with 8 additions and 17 deletions
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25
drivers/gpio/gpio-104-dio-48e.c
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@ -40,7 +40,6 @@ MODULE_PARM_DESC(dio_48e_irq, "ACCES 104-DIO-48E interrupt line number");
* @control: Control registers state
* @lock: synchronization lock to prevent I/O race conditions
* @base: base port address of the GPIO device
* @extent: extent of port address region of the GPIO device
* @irq: Interrupt line number
* @irq_mask: I/O bits affected by interrupts
*/
@ -51,7 +50,6 @@ struct dio48e_gpio {
unsigned char control[2];
spinlock_t lock;
unsigned base;
unsigned extent;
unsigned irq;
unsigned char irq_mask;
};
@ -310,11 +308,10 @@ static int __init dio48e_probe(struct platform_device *pdev)
if (!dio48egpio)
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;
}
dio48egpio->chip.label = name;
@ -328,7 +325,6 @@ static int __init dio48e_probe(struct platform_device *pdev)
dio48egpio->chip.get = dio48e_gpio_get;
dio48egpio->chip.set = dio48e_gpio_set;
dio48egpio->base = base;
dio48egpio->extent = extent;
dio48egpio->irq = irq;
spin_lock_init(&dio48egpio->lock);
@ -338,7 +334,7 @@ static int __init dio48e_probe(struct platform_device *pdev)
err = gpiochip_add_data(&dio48egpio->chip, dio48egpio);
if (err) {
dev_err(dev, "GPIO registering failed (%d)\n", err);
goto err_gpio_register;
return err;
}
/* initialize all GPIO as output */
@ -360,23 +356,19 @@ static int __init dio48e_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, dio48e_irq_handler, 0, name, dio48egpio);
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(&dio48egpio->chip);
err_gpio_register:
release_region(base, extent);
err_lock_io_port:
return err;
}
@ -386,7 +378,6 @@ static int dio48e_remove(struct platform_device *pdev)
free_irq(dio48egpio->irq, dio48egpio);
gpiochip_remove(&dio48egpio->chip);
release_region(dio48egpio->base, dio48egpio->extent);
return 0;
}