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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>
This commit is contained in:
Laurent Pinchart 2015-03-18 00:21:32 +02:00 committed by Rob Herring
parent 06e5801b8c
commit d7c146053d
1 changed files with 7 additions and 3 deletions
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10
drivers/of/irq.c
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@ -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;