[PATCH 2/5] gpio/omap: Use devm_ API and add request_mem_region

[DebBarma, Tarun Kanti]

Hi Benoit,

On Wed, Feb 15, 2012 at 9:34 PM, Benoit Cousson <b-cousson at ti.com> wrote:
> Replace the regular kzalloc and ioremap with the devm_ equivalent
> to simplify error handling.
>
> Add the missing devm_request_mem_region to reserve the region used
> by the driver.
>
> Signed-off-by: Benoit Cousson <b-cousson at ti.com>
> Cc: Tarun Kanti DebBarma <tarun.kanti at ti.com>
> ---
>  drivers/gpio/gpio-omap.c |   35 +++++++++++++++--------------------
>  1 files changed, 15 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
> index a0c3e03..c3a9dc8 100644
> --- a/drivers/gpio/gpio-omap.c
> +++ b/drivers/gpio/gpio-omap.c
> @@ -19,7 +19,7 @@
>  #include <linux/err.h>
>  #include <linux/clk.h>
>  #include <linux/io.h>
> -#include <linux/slab.h>
> +#include <linux/device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/pm.h>
>
> @@ -1052,23 +1052,19 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev)
>        struct gpio_bank *bank;
>        int ret = 0;
>
> -       if (!dev->platform_data) {
> -               ret = -EINVAL;
> -               goto err_exit;
> -       }
> +       if (!dev->platform_data)
> +               return -EINVAL;
>
> -       bank = kzalloc(sizeof(struct gpio_bank), GFP_KERNEL);
> +       bank = devm_kzalloc(&pdev->dev, sizeof(struct gpio_bank), GFP_KERNEL);
>        if (!bank) {
>                dev_err(dev, "Memory alloc failed\n");
> -               ret = -ENOMEM;
> -               goto err_exit;
> +               return -ENOMEM;
>        }
>
>        res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>        if (unlikely(!res)) {
>                dev_err(dev, "Invalid IRQ resource\n");
> -               ret = -ENODEV;
> -               goto err_free;
> +               return -ENODEV;
How is the memory allocated to 'bank' getting freed before return -ENODEV?

>        }
>
>        bank->irq = res->start;
> @@ -1096,15 +1092,19 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev)
>        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>        if (unlikely(!res)) {
>                dev_err(dev, "Invalid mem resource\n");
> -               ret = -ENODEV;
> -               goto err_free;
> +               return -ENODEV;
And here?

> +       }
> +
> +       if (!devm_request_mem_region(dev, res->start, resource_size(res),
> +                                    pdev->name)) {
> +               dev_err(dev, "Region already claimed\n");
> +               return -EBUSY;
>        }
>
> -       bank->base = ioremap(res->start, resource_size(res));
> +       bank->base = devm_ioremap(dev, res->start, resource_size(res));
>        if (!bank->base) {
>                dev_err(dev, "Could not ioremap\n");
> -               ret = -ENOMEM;
> -               goto err_free;
> +               return -ENOMEM;
And here?
--
Tarun
>        }
>
>        platform_set_drvdata(pdev, bank);
> @@ -1125,11 +1125,6 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev)
>        list_add_tail(&bank->node, &omap_gpio_list);
>
>        return ret;
> -
> -err_free:
> -       kfree(bank);
> -err_exit:
> -       return ret;
>  }
>
>  #ifdef CONFIG_ARCH_OMAP2PLUS
> --
> 1.7.0.4
>