backlight: atmel-pwm-bl: clean up probe error handling

Clean up probe error handling by checking parameters before any
allocations and removing an obsolete error label.  Also remove unnecessary
reset of private gpio number.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 12 insertions, 19 deletions

diff --git a/drivers/video/backlight/atmel-pwm-bl.c b/drivers/video/backlight/atmel-pwm-bl.c
index 4886028c9eaa..01af5c2d028a 100644
--- a/drivers/video/backlight/atmel-pwm-bl.c
+++ b/drivers/video/backlight/atmel-pwm-bl.c
@@ -126,40 +126,33 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
         struct atmel_pwm_bl *pwmbl;
         int retval;
 
+        pdata = dev_get_platdata(&pdev->dev);
+        if (!pdata)
+                return -ENODEV;
+
+        if (pdata->pwm_compare_max < pdata->pwm_duty_max ||
+                        pdata->pwm_duty_min > pdata->pwm_duty_max ||
+                        pdata->pwm_frequency == 0)
+                return -EINVAL;
+
         pwmbl = devm_kzalloc(&pdev->dev, sizeof(struct atmel_pwm_bl),
                                 GFP_KERNEL);
         if (!pwmbl)
                 return -ENOMEM;
 
         pwmbl->pdev = pdev;
-
-        pdata = dev_get_platdata(&pdev->dev);
-        if (!pdata) {
-                retval = -ENODEV;
-                goto err_free_mem;
-        }
-
-        if (pdata->pwm_compare_max < pdata->pwm_duty_max ||
-                        pdata->pwm_duty_min > pdata->pwm_duty_max ||
-                        pdata->pwm_frequency == 0) {
-                retval = -EINVAL;
-                goto err_free_mem;
-        }
-
         pwmbl->pdata = pdata;
         pwmbl->gpio_on = pdata->gpio_on;
 
         retval = pwm_channel_alloc(pdata->pwm_channel, &pwmbl->pwmc);
         if (retval)
-                goto err_free_mem;
+                return retval;
 
         if (pwmbl->gpio_on != -1) {
                 retval = devm_gpio_request(&pdev->dev, pwmbl->gpio_on,
                                         "gpio_atmel_pwm_bl");
-                if (retval) {
-                        pwmbl->gpio_on = -1;
+                if (retval)
                         goto err_free_pwm;
-                }
 
                 /* Turn display off by default. */
                 retval = gpio_direction_output(pwmbl->gpio_on,
@@ -197,7 +190,7 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
 
 err_free_pwm:
         pwm_channel_free(&pwmbl->pwmc);
-err_free_mem:
+
         return retval;
 }