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drivers/iio/adc/at91_adc.c: use devm_ functions

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The various devm_ functions allocate memory that is released when a driver
detaches.  This patch uses these functions for data that is allocated in
the probe function of a platform device and is only freed in the remove
function.

The call to platform_get_resource(pdev, IORESOURCE_MEM, 0) is moved coser
to the call to devm_request_and_ioremap, which is th first use of the
result of platform_get_resource.

This does not use devm_request_irq to ensure that free_irq is executed
before its idev argument is freed.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Julia Lawall 2012-07-31 14:09:00 +01:00 committed by Jonathan Cameron
parent d16f6dbddb
commit 390d75c128
1 changed files with 8 additions and 34 deletions
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42
drivers/iio/adc/at91_adc.c
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@ -545,13 +545,6 @@ static int __devinit at91_adc_probe(struct platform_device *pdev)
goto error_free_device;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "No resource defined\n");
ret = -ENXIO;
goto error_ret;
}
platform_set_drvdata(pdev, idev);
idev->dev.parent = &pdev->dev;
@ -566,18 +559,12 @@ static int __devinit at91_adc_probe(struct platform_device *pdev)
goto error_free_device;
}
if (!request_mem_region(res->start, resource_size(res),
"AT91 adc registers")) {
dev_err(&pdev->dev, "Resources are unavailable.\n");
ret = -EBUSY;
goto error_free_device;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
st->reg_base = ioremap(res->start, resource_size(res));
st->reg_base = devm_request_and_ioremap(&pdev->dev, res);
if (!st->reg_base) {
dev_err(&pdev->dev, "Failed to map registers.\n");
ret = -ENOMEM;
goto error_release_mem;
goto error_free_device;
}
/*
@ -592,10 +579,10 @@ static int __devinit at91_adc_probe(struct platform_device *pdev)
idev);
if (ret) {
dev_err(&pdev->dev, "Failed to allocate IRQ.\n");
goto error_unmap_reg;
goto error_free_device;
}
st->clk = clk_get(&pdev->dev, "adc_clk");
st->clk = devm_clk_get(&pdev->dev, "adc_clk");
if (IS_ERR(st->clk)) {
dev_err(&pdev->dev, "Failed to get the clock.\n");
ret = PTR_ERR(st->clk);
@ -605,7 +592,7 @@ static int __devinit at91_adc_probe(struct platform_device *pdev)
ret = clk_prepare(st->clk);
if (ret) {
dev_err(&pdev->dev, "Could not prepare the clock.\n");
goto error_free_clk;
goto error_free_irq;
}
ret = clk_enable(st->clk);
@ -614,7 +601,7 @@ static int __devinit at91_adc_probe(struct platform_device *pdev)
goto error_unprepare_clk;
}
st->adc_clk = clk_get(&pdev->dev, "adc_op_clk");
st->adc_clk = devm_clk_get(&pdev->dev, "adc_op_clk");
if (IS_ERR(st->adc_clk)) {
dev_err(&pdev->dev, "Failed to get the ADC clock.\n");
ret = PTR_ERR(st->clk);
@ -624,7 +611,7 @@ static int __devinit at91_adc_probe(struct platform_device *pdev)
ret = clk_prepare(st->adc_clk);
if (ret) {
dev_err(&pdev->dev, "Could not prepare the ADC clock.\n");
goto error_free_adc_clk;
goto error_disable_clk;
}
ret = clk_enable(st->adc_clk);
@ -697,20 +684,12 @@ error_disable_adc_clk:
clk_disable(st->adc_clk);
error_unprepare_adc_clk:
clk_unprepare(st->adc_clk);
error_free_adc_clk:
clk_put(st->adc_clk);
error_disable_clk:
clk_disable(st->clk);
error_unprepare_clk:
clk_unprepare(st->clk);
error_free_clk:
clk_put(st->clk);
error_free_irq:
free_irq(st->irq, idev);
error_unmap_reg:
iounmap(st->reg_base);
error_release_mem:
release_mem_region(res->start, resource_size(res));
error_free_device:
iio_device_free(idev);
error_ret:
@ -720,20 +699,15 @@ error_ret:
static int __devexit at91_adc_remove(struct platform_device *pdev)
{
struct iio_dev *idev = platform_get_drvdata(pdev);
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
struct at91_adc_state *st = iio_priv(idev);
iio_device_unregister(idev);
at91_adc_trigger_remove(idev);
at91_adc_buffer_remove(idev);
clk_disable_unprepare(st->adc_clk);
clk_put(st->adc_clk);
clk_disable(st->clk);
clk_unprepare(st->clk);
clk_put(st->clk);
free_irq(st->irq, idev);
iounmap(st->reg_base);
release_mem_region(res->start, resource_size(res));
iio_device_free(idev);
return 0;