[PATCH 3/7] gpio: 104-idio-16: Use devm_request_region

From: William Breathitt Gray
Date: Mon Feb 01 2016 - 18:55:16 EST


By the time request_region is called in the ACCES 104-IDIO-16 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@xxxxxxxxx>
---
drivers/gpio/gpio-104-idio-16.c | 22 ++++++++--------------
1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c
index 4d69b50..aecdc02 100644
--- a/drivers/gpio/gpio-104-idio-16.c
+++ b/drivers/gpio/gpio-104-idio-16.c
@@ -201,11 +201,10 @@ static int __init idio_16_probe(struct platform_device *pdev)
if (!idio16gpio)
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;
}

idio16gpio->chip.label = name;
@@ -230,7 +229,7 @@ static int __init idio_16_probe(struct platform_device *pdev)
err = gpiochip_add_data(&idio16gpio->chip, idio16gpio);
if (err) {
dev_err(dev, "GPIO registering failed (%d)\n", err);
- goto err_gpio_register;
+ return err;
}

/* Disable IRQ by default */
@@ -241,23 +240,19 @@ static int __init idio_16_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, idio_16_irq_handler, 0, name, idio16gpio);
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(&idio16gpio->chip);
-err_gpio_register:
- release_region(base, extent);
-err_lock_io_port:
return err;
}

@@ -267,7 +262,6 @@ static int idio_16_remove(struct platform_device *pdev)

free_irq(idio16gpio->irq, idio16gpio);
gpiochip_remove(&idio16gpio->chip);
- release_region(idio16gpio->base, idio16gpio->extent);

return 0;
}
--
2.4.10