pinctrl: rza1: Fix selector use for groups and functions

We must use a mutex around the generic_add functions and save the
function and group selector in case we need to remove them. Otherwise
the selector use will be racy for deferred probe at least.

Fixes: 5a49b644b307 ("pinctrl: Renesas RZ/A1 pin and gpio controller")
Reported-by: H. Nikolaus Schaller <hns@goldelico.com>
Cc: Christ van Willegen <cvwillegen@gmail.com>
Cc: Haojian Zhuang <haojian.zhuang@linaro.org>
Cc: Paul Cercueil <paul@crapouillou.net>
Cc: Sean Wang <sean.wang@mediatek.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Tested-By: H. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinctrl-rza1.c b/drivers/pinctrl/pinctrl-rza1.c
index 717c0f4..f76edf6 100644 (file)
--- a/drivers/pinctrl/pinctrl-rza1.c
+++ b/drivers/pinctrl/pinctrl-rza1.c
@@ -1006,6 +1006,7 @@ static int rza1_dt_node_to_map(struct pinctrl_dev *pctldev,
        const char *grpname;
        const char **fngrps;
        int ret, npins;
+       int gsel, fsel;
 
        npins = rza1_dt_node_pin_count(np);
        if (npins < 0) {
@@ -1055,18 +1056,19 @@ static int rza1_dt_node_to_map(struct pinctrl_dev *pctldev,
        fngrps[0] = grpname;
 
        mutex_lock(&rza1_pctl->mutex);
-       ret = pinctrl_generic_add_group(pctldev, grpname, grpins, npins,
-                                       NULL);
-       if (ret) {
+       gsel = pinctrl_generic_add_group(pctldev, grpname, grpins, npins,
+                                        NULL);
+       if (gsel < 0) {
                mutex_unlock(&rza1_pctl->mutex);
-               return ret;
+               return gsel;
        }
 
-       ret = pinmux_generic_add_function(pctldev, grpname, fngrps, 1,
-                                         mux_confs);
-       if (ret)
+       fsel = pinmux_generic_add_function(pctldev, grpname, fngrps, 1,
+                                          mux_confs);
+       if (fsel < 0) {
+               ret = fsel;
                goto remove_group;
-       mutex_unlock(&rza1_pctl->mutex);
+       }
 
        dev_info(rza1_pctl->dev, "Parsed function and group %s with %d pins\n",
                                 grpname, npins);
@@ -1083,15 +1085,15 @@ static int rza1_dt_node_to_map(struct pinctrl_dev *pctldev,
        (*map)->data.mux.group = np->name;
        (*map)->data.mux.function = np->name;
        *num_maps = 1;
+       mutex_unlock(&rza1_pctl->mutex);
 
        return 0;
 
 remove_function:
-       mutex_lock(&rza1_pctl->mutex);
-       pinmux_generic_remove_last_function(pctldev);
+       pinmux_generic_remove_function(pctldev, fsel);
 
 remove_group:
-       pinctrl_generic_remove_last_group(pctldev);
+       pinctrl_generic_remove_group(pctldev, gsel);
        mutex_unlock(&rza1_pctl->mutex);
 
        dev_info(rza1_pctl->dev, "Unable to parse function and group %s\n",