pinctrl: don't print unavailable function groups

There is no reason to try to print groups associated to a function if
get_function_groups returns an error. Moreover, it can lead to a NULL
pointer dereference error.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 77f82b23f7be..e7ae890dcf1a 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -557,9 +557,12 @@ static int pinmux_functions_show(struct seq_file *s, void *what)
 
                 ret = pmxops->get_function_groups(pctldev, func_selector,
                                                   &groups, &num_groups);
-                if (ret)
+                if (ret) {
                         seq_printf(s, "function %s: COULD NOT GET GROUPS\n",
                                    func);
+                        func_selector++;
+                        continue;
+                }
 
                 seq_printf(s, "function: %s, groups = [ ", func);
                 for (i = 0; i < num_groups; i++)