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

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>

1 files changed, 8 insertions, 34 deletions

diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index f61780a02374..98c96f90c88b 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -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;