[PATCH 2/4] pinctrl: at91: Fix failure path in at91_gpio_probe path

[Pramod Gurav]

This fixes the whole error handling in probe function by capturing and
returning error values on kernel function like clk_prepare,
clk_enable, gpiochip_add etc.

CC: Jean-Christophe Plagniol-Villard <plagn...@jcrosoft.com>
CC: Linus Walleij <linus.wall...@linaro.org>
Signed-off-by: Pramod Gurav <pramod.gu...@smartplayin.com>
---
 drivers/pinctrl/pinctrl-at91.c |   20 +++++++++++++-------
 1 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index 480460d..7abe683 100644
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c
@@ -1578,16 +1578,19 @@ static int at91_gpio_probe(struct platform_device *pdev)
        at91_chip->clock = devm_clk_get(&pdev->dev, NULL);
        if (IS_ERR(at91_chip->clock)) {
                dev_err(&pdev->dev, "failed to get clock, ignoring.\n");
+               ret = IS_ERR(at91_chip->clock);
                goto err;
        }
 
-       if (clk_prepare(at91_chip->clock))
-               goto err;
+       ret = clk_prepare(at91_chip->clock);
+       if (ret)
+               goto clk_prepare_err;
 
        /* enable PIO controller's clock */
-       if (clk_enable(at91_chip->clock)) {
+       ret = clk_enable(at91_chip->clock);
+       if (ret) {
                dev_err(&pdev->dev, "failed to enable clock, ignoring.\n");
-               goto clk_err;
+               goto clk_enable_err;
        }
 
        at91_chip->chip = at91_gpio_template;
@@ -1612,7 +1615,7 @@ static int at91_gpio_probe(struct platform_device *pdev)
 
        if (!names) {
                ret = -ENOMEM;
-               goto clk_err;
+               goto clk_enable_err;
        }
 
        for (i = 0; i < chip->ngpio; i++)
@@ -1630,7 +1633,7 @@ static int at91_gpio_probe(struct platform_device *pdev)
 
        ret = gpiochip_add(chip);
        if (ret)
-               goto clk_err;
+               goto gpiochip_add_err;
 
        gpio_chips[alias_idx] = at91_chip;
        gpio_banks = max(gpio_banks, alias_idx + 1);
@@ -1643,8 +1646,11 @@ static int at91_gpio_probe(struct platform_device *pdev)
 
        return 0;
 
-clk_err:
+gpiochip_add_err:
+       clk_disable(at91_chip->clock);
+clk_enable_err:
        clk_unprepare(at91_chip->clock);
+clk_prepare_err:
 err:
        dev_err(&pdev->dev, "Failure %i for GPIO %i\n", ret, alias_idx);
 
-- 
1.7.0.4

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