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staging: iio: Introduce the use of devm_ioremap_resource 

This patch introduces the use of devm_ioremap_resource. It does away
with call to request_mem_region and the error checking on
platform_get_resource. Also, the calls to free the allocated resources
like release_mem_region and iounmap are done away with. The ret variable
in the probe function is also eliminated. Also, a bug is fixed as the
goto in the error handling of request_mem_region should not have
called release_mem_region which releases a resource that has not been
allocated.

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Himangi Saraogi 2014-01-07 19:44:00 +00:00 committed by Jonathan Cameron
parent 49f681fab6
commit 744966d6dc
1 changed files with 6 additions and 31 deletions
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37
drivers/staging/iio/adc/ad7606_par.c
View File

@ -53,7 +53,7 @@ static int ad7606_par_probe(struct platform_device *pdev)
struct iio_dev *indio_dev;
void __iomem *addr;
resource_size_t remap_size;
int ret, irq;
int irq;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
@ -62,56 +62,31 @@ static int ad7606_par_probe(struct platform_device *pdev)
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
addr = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(addr))
return PTR_ERR(addr);
remap_size = resource_size(res);
/* Request the regions */
if (!request_mem_region(res->start, remap_size, "iio-ad7606")) {
ret = -EBUSY;
goto out1;
}
addr = ioremap(res->start, remap_size);
if (!addr) {
ret = -ENOMEM;
goto out1;
}
indio_dev = ad7606_probe(&pdev->dev, irq, addr,
platform_get_device_id(pdev)->driver_data,
remap_size > 1 ? &ad7606_par16_bops :
&ad7606_par8_bops);
if (IS_ERR(indio_dev)) {
ret = PTR_ERR(indio_dev);
goto out2;
}
if (IS_ERR(indio_dev))
return PTR_ERR(indio_dev);
platform_set_drvdata(pdev, indio_dev);
return 0;
out2:
iounmap(addr);
out1:
release_mem_region(res->start, remap_size);
return ret;
}
static int ad7606_par_remove(struct platform_device *pdev)
{
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
struct resource *res;
struct ad7606_state *st = iio_priv(indio_dev);
ad7606_remove(indio_dev, platform_get_irq(pdev, 0));
iounmap(st->base_address);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
return 0;
}