[PATCH v2] pinctrl: single: fix pinctrl_spec.args_count bounds check

[Drew Fustini]

The property #pinctrl-cells can either be 1 or 2:

- if #pinctrl-cells = <1>, then pinctrl_spec.args_count = 2
- if #pinctrl-cells = <2>, then pinctrl_spec.args_count = 3

All other values of pinctrl_spec.args_count are incorrect.  This fix
checks the upper bound instead of just the lower bound.

Fixes: a13395418888 ("pinctrl: single: parse #pinctrl-cells = 2")
Reported-by: Trent Piepho <tpie...@gmail.com>
Link: https://lore.kernel.org/linux-omap/3139716.CMS8C0sQ7x@zen.local/
Signed-off-by: Drew Fustini <d...@beagleboard.org>
---
v2 change:
- correct the description as I had previously been mistakenly using the
  term #pinctrl-cells instead of pinctrl_spec.args_count

 drivers/pinctrl/pinctrl-single.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index efe41abc5d47..5cbf0e55087c 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -1014,7 +1014,7 @@ static int pcs_parse_one_pinctrl_entry(struct pcs_device 
*pcs,
                if (res)
                        return res;
 
-               if (pinctrl_spec.args_count < 2) {
+               if (pinctrl_spec.args_count < 2 || pinctrl_spec.args_count > 3) 
{
                        dev_err(pcs->dev, "invalid args_count for spec: %i\n",
                                pinctrl_spec.args_count);
                        break;
-- 
2.25.1