of/irq: Fix of_irq_parse_one() returned error codes

The error code paths that require cleanup use a goto to jump to the
cleanup code and return an error code. However, the error code variable
res, which is initialized to -EINVAL when declared, is then overwritten
with the return value of of_parse_phandle_with_args(), and reused as the
return code from of_irq_parse_one(). This leads to an undetermined error
being returned instead of the expected -EINVAL value. Fix it.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Cc: stable@vger.kernel.org # 3.13+
Signed-off-by: Rob Herring <robh@kernel.org>

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 0d77658..1a79806 100644 (file)
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -290,7 +290,7 @@ int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_ar
        struct device_node *p;
        const __be32 *intspec, *tmp, *addr;
        u32 intsize, intlen;
-       int i, res = -EINVAL;
+       int i, res;
 
        pr_debug("of_irq_parse_one: dev=%s, index=%d\n", of_node_full_name(device), index);
 
@@ -323,15 +323,19 @@ int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_ar
 
        /* Get size of interrupt specifier */
        tmp = of_get_property(p, "#interrupt-cells", NULL);
-       if (tmp == NULL)
+       if (tmp == NULL) {
+               res = -EINVAL;
                goto out;
+       }
        intsize = be32_to_cpu(*tmp);
 
        pr_debug(" intsize=%d intlen=%d\n", intsize, intlen);
 
        /* Check index */
-       if ((index + 1) * intsize > intlen)
+       if ((index + 1) * intsize > intlen) {
+               res = -EINVAL;
                goto out;
+       }
 
        /* Copy intspec into irq structure */
        intspec += index * intsize;