From 5febb3c9d52c65686a8e473a31f15137852f4b5e Mon Sep 17 00:00:00 2001 From: Axel Lin Date: Thu, 5 Jul 2012 23:12:49 +0800 Subject: [PATCH] regulator: s5m8767: Properly handle gpio_request failure Convert to devm_gpio_request to save a few error handling code. This patch properly handle the gpio_request failure, we should return error when gpio_request fails rather than just show warning. I think one of the reason we got -EBUSY is because current code does not free gpios in s5m8767_pmic_remove(). So it got -EBUSY when reload the module. Yest another reason is in current code if gpio_request() returns error, the rest of the code still calls gpio_direction_output to config buck_gpios and buck_ds gpios. This looks wrong to me. Signed-off-by: Axel Lin Signed-off-by: Mark Brown --- drivers/regulator/s5m8767.c | 45 ++++++++++++++++++------------------- 1 file changed, 22 insertions(+), 23 deletions(-) diff --git a/drivers/regulator/s5m8767.c b/drivers/regulator/s5m8767.c index 1ad9c3c0da8d..102287fa7ecb 100644 --- a/drivers/regulator/s5m8767.c +++ b/drivers/regulator/s5m8767.c @@ -620,20 +620,21 @@ static __devinit int s5m8767_pmic_probe(struct platform_device *pdev) if (gpio_is_valid(pdata->buck_gpios[0]) && gpio_is_valid(pdata->buck_gpios[1]) && gpio_is_valid(pdata->buck_gpios[2])) { - ret = gpio_request(pdata->buck_gpios[0], "S5M8767 SET1"); - if (ret == -EBUSY) - dev_warn(&pdev->dev, "Duplicated gpio request" - " for SET1\n"); + ret = devm_gpio_request(&pdev->dev, pdata->buck_gpios[0], + "S5M8767 SET1"); + if (ret) + return ret; - ret = gpio_request(pdata->buck_gpios[1], "S5M8767 SET2"); - if (ret == -EBUSY) - dev_warn(&pdev->dev, "Duplicated gpio request" - " for SET2\n"); + ret = devm_gpio_request(&pdev->dev, pdata->buck_gpios[1], + "S5M8767 SET2"); + if (ret) + return ret; + + ret = devm_gpio_request(&pdev->dev, pdata->buck_gpios[2], + "S5M8767 SET3"); + if (ret) + return ret; - ret = gpio_request(pdata->buck_gpios[2], "S5M8767 SET3"); - if (ret == -EBUSY) - dev_warn(&pdev->dev, "Duplicated gpio request" - " for SET3\n"); /* SET1 GPIO */ gpio_direction_output(pdata->buck_gpios[0], (s5m8767->buck_gpioindex >> 2) & 0x1); @@ -643,25 +644,23 @@ static __devinit int s5m8767_pmic_probe(struct platform_device *pdev) /* SET3 GPIO */ gpio_direction_output(pdata->buck_gpios[2], (s5m8767->buck_gpioindex >> 0) & 0x1); - ret = 0; - } else { dev_err(&pdev->dev, "GPIO NOT VALID\n"); ret = -EINVAL; return ret; } - ret = gpio_request(pdata->buck_ds[0], "S5M8767 DS2"); - if (ret == -EBUSY) - dev_warn(&pdev->dev, "Duplicated gpio request for DS2\n"); + ret = devm_gpio_request(&pdev->dev, pdata->buck_ds[0], "S5M8767 DS2"); + if (ret) + return ret; - ret = gpio_request(pdata->buck_ds[1], "S5M8767 DS3"); - if (ret == -EBUSY) - dev_warn(&pdev->dev, "Duplicated gpio request for DS3\n"); + ret = devm_gpio_request(&pdev->dev, pdata->buck_ds[1], "S5M8767 DS3"); + if (ret) + return ret; - ret = gpio_request(pdata->buck_ds[2], "S5M8767 DS4"); - if (ret == -EBUSY) - dev_warn(&pdev->dev, "Duplicated gpio request for DS4\n"); + ret = devm_gpio_request(&pdev->dev, pdata->buck_ds[2], "S5M8767 DS4"); + if (ret) + return ret; /* DS2 GPIO */ gpio_direction_output(pdata->buck_ds[0], 0x0);