drivers/gpio/gpio-langwell.c: fix error return code

Convert a 0 error return code to a negative one, as returned elsewhere in the
function.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret;
expression e,e1,e2,e3,e4,x;
@@

(
if (\(ret != 0\|ret < 0\) || ...) { ... return ...; }
|
ret = 0
)
... when != ret = e1
*x = \(kmalloc\|kzalloc\|kcalloc\|devm_kzalloc\|ioremap\|ioremap_nocache\|devm_ioremap\|devm_ioremap_nocache\)(...);
... when != x = e2
    when != ret = e3
*if (x == NULL || ...)
{
  ... when != ret = e4
*  return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-langwell.c b/drivers/gpio/gpio-langwell.c
index a1c8754..202a992 100644 (file)
--- a/drivers/gpio/gpio-langwell.c
+++ b/drivers/gpio/gpio-langwell.c
@@ -339,7 +339,7 @@ static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
        resource_size_t start, len;
        struct lnw_gpio *lnw;
        u32 gpio_base;
-       int retval = 0;
+       int retval;
        int ngpio = id->driver_data;
 
        retval = pci_enable_device(pdev);
@@ -357,6 +357,7 @@ static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
        base = ioremap_nocache(start, len);
        if (!base) {
                dev_err(&pdev->dev, "error mapping bar1\n");
+               retval = -EFAULT;
                goto err3;
        }
        gpio_base = *((u32 *)base + 1);
@@ -381,8 +382,10 @@ static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
 
        lnw->domain = irq_domain_add_linear(pdev->dev.of_node, ngpio,
                                            &lnw_gpio_irq_ops, lnw);
-       if (!lnw->domain)
+       if (!lnw->domain) {
+               retval = -ENOMEM;
                goto err3;
+       }
 
        lnw->reg_base = base;
        lnw->chip.label = dev_name(&pdev->dev);