linux-kernel - [PATCH] pinctrl: renesas: rzg2l: Fix double unlock in rzg2l_dt_subnode_to

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Message-ID: <f8c3a3a0-7c48-4e40-8af0-ed4e9d9b049f@moroto.mountain>
Date: Wed, 10 Jan 2024 21:41:41 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-renesas-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] pinctrl: renesas: rzg2l: Fix double unlock in
 rzg2l_dt_subnode_to_map()

If rzg2l_map_add_config() fails then the error handling calls
mutex_unlock(&pctrl->mutex) but we're not holding that mutex.  Move
the unlocks to before the gotos to avoid this situation.

Fixes: d3aaa7203a17 ("pinctrl: renesas: rzg2l: Add pin configuration support for pinmux groups")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
(Not tested).

 drivers/pinctrl/renesas/pinctrl-rzg2l.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index 80fb5011c7bb..8bbfb0530538 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -453,7 +453,8 @@ static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 	gsel = pinctrl_generic_add_group(pctldev, name, pins, num_pinmux, NULL);
 	if (gsel < 0) {
 		ret = gsel;
-		goto unlock;
+		mutex_unlock(&pctrl->mutex);
+		goto done;
 	}
 
 	/*
@@ -464,6 +465,7 @@ static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 	fsel = pinmux_generic_add_function(pctldev, name, pin_fn, 1, psel_val);
 	if (fsel < 0) {
 		ret = fsel;
+		mutex_unlock(&pctrl->mutex);
 		goto remove_group;
 	}
 
@@ -490,8 +492,6 @@ static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 
 remove_group:
 	pinctrl_generic_remove_group(pctldev, gsel);
-unlock:
-	mutex_unlock(&pctrl->mutex);
 done:
 	*index = idx;
 	kfree(configs);
-- 
2.43.0