Input: gpio_keys - convert to use devm_*

This makes the error handling much more simpler than open-coding everything
and in addition makes the probe function smaller an tidier.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 2db1324..52dc872 100644 (file)
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -578,23 +578,18 @@ gpio_keys_get_devtree_pdata(struct device *dev)
        int i;
 
        node = dev->of_node;
-       if (!node) {
-               error = -ENODEV;
-               goto err_out;
-       }
+       if (!node)
+               return ERR_PTR(-ENODEV);
 
        nbuttons = of_get_child_count(node);
-       if (nbuttons == 0) {
-               error = -ENODEV;
-               goto err_out;
-       }
+       if (nbuttons == 0)
+               return ERR_PTR(-ENODEV);
 
-       pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button),
-                       GFP_KERNEL);
-       if (!pdata) {
-               error = -ENOMEM;
-               goto err_out;
-       }
+       pdata = devm_kzalloc(dev,
+                            sizeof(*pdata) + nbuttons * sizeof(*button),
+                            GFP_KERNEL);
+       if (!pdata)
+               return ERR_PTR(-ENOMEM);
 
        pdata->buttons = (struct gpio_keys_button *)(pdata + 1);
        pdata->nbuttons = nbuttons;
@@ -619,7 +614,7 @@ gpio_keys_get_devtree_pdata(struct device *dev)
                                dev_err(dev,
                                        "Failed to get gpio flags, error: %d\n",
                                        error);
-                       goto err_free_pdata;
+                       return ERR_PTR(error);
                }
 
                button = &pdata->buttons[i++];
@@ -630,8 +625,7 @@ gpio_keys_get_devtree_pdata(struct device *dev)
                if (of_property_read_u32(pp, "linux,code", &button->code)) {
                        dev_err(dev, "Button without keycode: 0x%x\n",
                                button->gpio);
-                       error = -EINVAL;
-                       goto err_free_pdata;
+                       return ERR_PTR(-EINVAL);
                }
 
                button->desc = of_get_property(pp, "label", NULL);
@@ -646,17 +640,10 @@ gpio_keys_get_devtree_pdata(struct device *dev)
                        button->debounce_interval = 5;
        }
 
-       if (pdata->nbuttons == 0) {
-               error = -EINVAL;
-               goto err_free_pdata;
-       }
+       if (pdata->nbuttons == 0)
+               return ERR_PTR(-EINVAL);
 
        return pdata;
-
-err_free_pdata:
-       kfree(pdata);
-err_out:
-       return ERR_PTR(error);
 }
 
 static struct of_device_id gpio_keys_of_match[] = {
@@ -691,6 +678,7 @@ static int gpio_keys_probe(struct platform_device *pdev)
        const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
        struct gpio_keys_drvdata *ddata;
        struct input_dev *input;
+       size_t size;
        int i, error;
        int wakeup = 0;
 
@@ -700,14 +688,18 @@ static int gpio_keys_probe(struct platform_device *pdev)
                        return PTR_ERR(pdata);
        }
 
-       ddata = kzalloc(sizeof(struct gpio_keys_drvdata) +
-                       pdata->nbuttons * sizeof(struct gpio_button_data),
-                       GFP_KERNEL);
-       input = input_allocate_device();
-       if (!ddata || !input) {
+       size = sizeof(struct gpio_keys_drvdata) +
+                       pdata->nbuttons * sizeof(struct gpio_button_data);
+       ddata = devm_kzalloc(dev, size, GFP_KERNEL);
+       if (!ddata) {
                dev_err(dev, "failed to allocate state\n");
-               error = -ENOMEM;
-               goto fail1;
+               return -ENOMEM;
+       }
+
+       input = devm_input_allocate_device(dev);
+       if (!input) {
+               dev_err(dev, "failed to allocate input device\n");
+               return -ENOMEM;
        }
 
        ddata->pdata = pdata;
@@ -768,20 +760,12 @@ static int gpio_keys_probe(struct platform_device *pdev)
        while (--i >= 0)
                gpio_remove_key(&ddata->data[i]);
 
- fail1:
-       input_free_device(input);
-       kfree(ddata);
-       /* If we have no platform data, we allocated pdata dynamically. */
-       if (!dev_get_platdata(&pdev->dev))
-               kfree(pdata);
-
        return error;
 }
 
 static int gpio_keys_remove(struct platform_device *pdev)
 {
        struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);
-       struct input_dev *input = ddata->input;
        int i;
 
        sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
@@ -791,14 +775,6 @@ static int gpio_keys_remove(struct platform_device *pdev)
        for (i = 0; i < ddata->pdata->nbuttons; i++)
                gpio_remove_key(&ddata->data[i]);
 
-       input_unregister_device(input);
-
-       /* If we have no platform data, we allocated pdata dynamically. */
-       if (!dev_get_platdata(&pdev->dev))
-               kfree(ddata->pdata);
-
-       kfree(ddata);
-
        return 0;
 }