pinctrl: sh-pfc: checker: Add helper for safe name comparison

Add a helper to check if two strings are identical, skipping NULL
pointers.  This simplifies callers.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20200110131927.1029-4-geert+renesas@glider.be

diff --git a/drivers/pinctrl/sh-pfc/core.c b/drivers/pinctrl/sh-pfc/core.c
index d0b87a0..aad3f62 100644 (file)
--- a/drivers/pinctrl/sh-pfc/core.c
+++ b/drivers/pinctrl/sh-pfc/core.c
@@ -751,6 +751,14 @@ static bool __init is0s(const u16 *enum_ids, unsigned int n)
        return true;
 }
 
+static bool __init same_name(const char *a, const char *b)
+{
+       if (!a || !b)
+               return false;
+
+       return !strcmp(a, b);
+}
+
 static void __init sh_pfc_check_cfg_reg(const char *drvname,
                                        const struct pinmux_cfg_reg *cfg_reg)
 {
@@ -790,7 +798,7 @@ static void __init sh_pfc_check_info(const struct sh_pfc_soc_info *info)
        /* Check pins */
        for (i = 0; i < info->nr_pins; i++) {
                for (j = 0; j < i; j++) {
-                       if (!strcmp(info->pins[i].name, info->pins[j].name))
+                       if (same_name(info->pins[i].name, info->pins[j].name))
                                sh_pfc_err("pin %s/%s: name conflict\n",
                                           info->pins[i].name,
                                           info->pins[j].name);
@@ -824,9 +832,8 @@ static void __init sh_pfc_check_info(const struct sh_pfc_soc_info *info)
                }
                for (j = 0; j < func->nr_groups; j++) {
                        for (k = 0; k < info->nr_groups; k++) {
-                               if (info->groups[k].name &&
-                                   !strcmp(func->groups[j],
-                                           info->groups[k].name)) {
+                               if (same_name(func->groups[j],
+                                             info->groups[k].name)) {
                                        refcnts[k]++;
                                        break;
                                }