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SubjectRe: [PATCH v2 2/4] input: keyboard: tegra: use devm_* for resource allocation
Hi Laxman,

On Sat, Jan 05, 2013 at 01:15:08PM +0530, Laxman Dewangan wrote:
> Use devm_* for memory, clock, input device allocation. This reduces
> code for freeing these resources.
>
> Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
> ---
> Changes from V1:
> None
>
> drivers/input/keyboard/tegra-kbc.c | 93 +++++++++++-------------------------
> 1 files changed, 28 insertions(+), 65 deletions(-)
>
> diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
> index f1d3ba0..c036425 100644
> --- a/drivers/input/keyboard/tegra-kbc.c
> +++ b/drivers/input/keyboard/tegra-kbc.c
> @@ -618,7 +618,7 @@ static struct tegra_kbc_platform_data *tegra_kbc_dt_parse_pdata(
> if (!np)
> return NULL;
>
> - pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
> + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> if (!pdata)
> return NULL;
>
> @@ -700,33 +700,36 @@ static int tegra_kbc_probe(struct platform_device *pdev)
> if (!pdata)
> pdata = tegra_kbc_dt_parse_pdata(pdev);
>
> - if (!pdata)
> + if (!pdata) {
> + dev_err(&pdev->dev, "Platform data missing\n");
> return -EINVAL;
> -
> - if (!tegra_kbc_check_pin_cfg(pdata, &pdev->dev, &num_rows)) {
> - err = -EINVAL;
> - goto err_free_pdata;
> }
>
> + if (!tegra_kbc_check_pin_cfg(pdata, &pdev->dev, &num_rows))
> + return -EINVAL;
> +
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> if (!res) {
> dev_err(&pdev->dev, "failed to get I/O memory\n");
> - err = -ENXIO;
> - goto err_free_pdata;
> + return -ENXIO;
> }
>
> irq = platform_get_irq(pdev, 0);
> if (irq < 0) {
> dev_err(&pdev->dev, "failed to get keyboard IRQ\n");
> - err = -ENXIO;
> - goto err_free_pdata;
> + return -ENXIO;
> + }
> +
> + kbc = devm_kzalloc(&pdev->dev, sizeof(*kbc), GFP_KERNEL);
> + if (!kbc) {
> + dev_err(&pdev->dev, "failed to alloc memory for kbc\n");
> + return -ENOMEM;
> }
>
> - kbc = kzalloc(sizeof(*kbc), GFP_KERNEL);
> - input_dev = input_allocate_device();
> - if (!kbc || !input_dev) {
> - err = -ENOMEM;
> - goto err_free_mem;
> + input_dev = devm_input_allocate_device(&pdev->dev);
> + if (!input_dev) {
> + dev_err(&pdev->dev, "failed to allocate input device\n");
> + return -ENOMEM;
> }
>
> kbc->pdata = pdata;
> @@ -735,25 +738,16 @@ static int tegra_kbc_probe(struct platform_device *pdev)
> spin_lock_init(&kbc->lock);
> setup_timer(&kbc->timer, tegra_kbc_keypress_timer, (unsigned long)kbc);
>
> - res = request_mem_region(res->start, resource_size(res), pdev->name);
> - if (!res) {
> - dev_err(&pdev->dev, "failed to request I/O memory\n");
> - err = -EBUSY;
> - goto err_free_mem;
> - }
> -
> - kbc->mmio = ioremap(res->start, resource_size(res));
> + kbc->mmio = devm_request_and_ioremap(&pdev->dev, res);
> if (!kbc->mmio) {
> - dev_err(&pdev->dev, "failed to remap I/O memory\n");
> - err = -ENXIO;
> - goto err_free_mem_region;
> + dev_err(&pdev->dev, "Cannot request memregion/iomap address\n");
> + return -EADDRNOTAVAIL;

Erm, no, -EBUSY please.

> }
>
> - kbc->clk = clk_get(&pdev->dev, NULL);
> + kbc->clk = devm_clk_get(&pdev->dev, NULL);
> if (IS_ERR(kbc->clk)) {
> dev_err(&pdev->dev, "failed to get keyboard clock\n");
> - err = PTR_ERR(kbc->clk);
> - goto err_iounmap;
> + return PTR_ERR(kbc->clk);
> }
>
> /*
> @@ -778,9 +772,9 @@ static int tegra_kbc_probe(struct platform_device *pdev)
> input_dev->close = tegra_kbc_close;
>
> err = tegra_kbd_setup_keymap(kbc);
> - if (err) {
> + if (err < 0) {

Why is this change? As far as I can see tegra_kbd_setup_keymap() never
returns positive values.

> dev_err(&pdev->dev, "failed to setup keymap\n");
> - goto err_put_clk;
> + return err;
> }
>
> __set_bit(EV_REP, input_dev->evbit);
> @@ -790,15 +784,15 @@ static int tegra_kbc_probe(struct platform_device *pdev)
>
> err = request_irq(kbc->irq, tegra_kbc_isr,
> IRQF_NO_SUSPEND | IRQF_TRIGGER_HIGH, pdev->name, kbc);
> - if (err) {
> + if (err < 0) {

Neither request_irq(). BTW, why not devm_request_irq?

> dev_err(&pdev->dev, "failed to request keyboard IRQ\n");
> - goto err_put_clk;
> + return err;
> }
>
> disable_irq(kbc->irq);
>
> err = input_register_device(kbc->idev);
> - if (err) {
> + if (err < 0) {

Again, input_register_device() returns 0 on success.

> dev_err(&pdev->dev, "failed to register input device\n");
> goto err_free_irq;
> }
> @@ -810,46 +804,15 @@ static int tegra_kbc_probe(struct platform_device *pdev)
>
> err_free_irq:
> free_irq(kbc->irq, pdev);
> -err_put_clk:
> - clk_put(kbc->clk);
> -err_iounmap:
> - iounmap(kbc->mmio);
> -err_free_mem_region:
> - release_mem_region(res->start, resource_size(res));
> -err_free_mem:
> - input_free_device(input_dev);
> - kfree(kbc);
> -err_free_pdata:
> - if (!pdev->dev.platform_data)
> - kfree(pdata);
> -
> return err;
> }
>
> static int tegra_kbc_remove(struct platform_device *pdev)
> {
> struct tegra_kbc *kbc = platform_get_drvdata(pdev);
> - struct resource *res;
> -
> - platform_set_drvdata(pdev, NULL);
>
> free_irq(kbc->irq, pdev);
> - clk_put(kbc->clk);
> -
> input_unregister_device(kbc->idev);

You do not need to call input_unregister_device for managed input
devices, and if you switch request_irq to managed variant you can remove
tegra_kbc_remove() altogether.

> - iounmap(kbc->mmio);
> - res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - release_mem_region(res->start, resource_size(res));
> -
> - /*
> - * If we do not have platform data attached to the device we
> - * allocated it ourselves and thus need to free it.
> - */
> - if (!pdev->dev.platform_data)
> - kfree(kbc->pdata);
> -
> - kfree(kbc);
> -
> return 0;
> }
>
> --
> 1.7.1.1
>

Thanks.

--
Dmitry


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