[PATCH v2] pinctrl: mvebu: fix num_settings in mpp group assignment

[Sebastian Hesselbarth]

When assigning mpp settings from static mpp modes to mpp groups,
we do not want any groups that have no supported setting for a
specific Kirkwood variant. However, when there is at least a
single supported setting, we need to assign the number of all
settings in this mode to grp->num_settings as we are reusing
the static modes table.

Fixes: 0581b16b1840 ("pinctrl: mvebu: complain about missing group after checking variant")
Reported-by: Aaro Koskinen <aaro.koskinen at iki.fi>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
--
Changelog:
v1->v2:
- Chose a less intrusive fix by adding supp_settings variable
  instead of looping over the settings twice.

Aaro, Linus,

I prefer this less intrusive fix in favor of v1.

@Aaro: Can you please test again?

Cc: Aaro Koskinen <aaro.koskinen at iki.fi>
Cc: Linus Walleij <linus.walleij at linaro.org>
Cc: Gregory Clement <gregory.clement at free-electrons.com>
Cc: Andrew Lunn <andrew at lunn.ch>
Cc: linux-arm-kernel at lists.infradead.org
---
 drivers/pinctrl/mvebu/pinctrl-mvebu.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/mvebu/pinctrl-mvebu.c b/drivers/pinctrl/mvebu/pinctrl-mvebu.c
index e4d473811bb3..3ef798fac81b 100644
--- a/drivers/pinctrl/mvebu/pinctrl-mvebu.c
+++ b/drivers/pinctrl/mvebu/pinctrl-mvebu.c
@@ -666,16 +666,19 @@ int mvebu_pinctrl_probe(struct platform_device *pdev)
 		struct mvebu_mpp_ctrl_setting *set = &mode->settings[0];
 		struct mvebu_pinctrl_group *grp;
 		unsigned num_settings;
+		unsigned supp_settings;
 
-		for (num_settings = 0; ; set++) {
+		for (num_settings = 0, supp_settings = 0; ; set++) {
 			if (!set->name)
 				break;
 
+			num_settings++;
+
 			/* skip unsupported settings for this variant */
 			if (pctl->variant && !(pctl->variant & set->variant))
 				continue;
 
-			num_settings++;
+			supp_settings++;
 
 			/* find gpio/gpo/gpi settings */
 			if (strcmp(set->name, "gpio") == 0)
@@ -688,7 +691,7 @@ int mvebu_pinctrl_probe(struct platform_device *pdev)
 		}
 
 		/* skip modes with no settings for this variant */
-		if (!num_settings)
+		if (!supp_settings)
 			continue;
 
 		grp = mvebu_pinctrl_find_group_by_pid(pctl, mode->pid);
-- 
2.1.4