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gpio: 104-idi-48: Use devm_request_region

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By the time request_region is called in the ACCES 104-IDI-48 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 15:15:22 -05:00 committed by Linus Walleij
parent aa6c360226
commit 5cfc05761b
1 changed files with 8 additions and 17 deletions
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25
drivers/gpio/gpio-104-idi-48.c
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@ -39,7 +39,6 @@ MODULE_PARM_DESC(idi_48_irq, "ACCES 104-IDI-48 interrupt line number");
* @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
* @extent: extent of port address region of the GPIO device
* @irq: Interrupt line number
* @cos_enb: Change-Of-State IRQ enable boundaries mask
*/
@ -49,7 +48,6 @@ struct idi_48_gpio {
spinlock_t ack_lock;
unsigned char irq_mask[6];
unsigned base;
unsigned extent;
unsigned irq;
unsigned char cos_enb;
};
@ -227,11 +225,10 @@ static int __init idi_48_probe(struct platform_device *pdev)
if (!idi48gpio)
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;
}
idi48gpio->chip.label = name;
@ -243,7 +240,6 @@ static int __init idi_48_probe(struct platform_device *pdev)
idi48gpio->chip.direction_input = idi_48_gpio_direction_input;
idi48gpio->chip.get = idi_48_gpio_get;
idi48gpio->base = base;
idi48gpio->extent = extent;
idi48gpio->irq = irq;
spin_lock_init(&idi48gpio->lock);
@ -253,7 +249,7 @@ static int __init idi_48_probe(struct platform_device *pdev)
err = gpiochip_add_data(&idi48gpio->chip, idi48gpio);
if (err) {
dev_err(dev, "GPIO registering failed (%d)\n", err);
goto err_gpio_register;
return err;
}
/* Disable IRQ by default */
@ -264,24 +260,20 @@ static int __init idi_48_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, idi_48_irq_handler, IRQF_SHARED, name,
idi48gpio);
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(&idi48gpio->chip);
err_gpio_register:
release_region(base, extent);
err_lock_io_port:
return err;
}
@ -291,7 +283,6 @@ static int idi_48_remove(struct platform_device *pdev)
free_irq(idi48gpio->irq, idi48gpio);
gpiochip_remove(&idi48gpio->chip);
release_region(idi48gpio->base, idi48gpio->extent);
return 0;
}