linux-kernel - [PATCH] bus: ts-nbus: Fix the error handling path of ts_nbus

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Date:   Sun, 11 Dec 2022 08:08:38 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Sebastien Bourdelin <sebastien.bourdelin@...oirfairelinux.com>,
        Arnd Bergmann <arnd@...db.de>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] bus: ts-nbus: Fix the error handling path of ts_nbus_probe()

If an error occurs after a successful pwm_enable() call, it must be undone
by a corresponding pwm_disable(), as already done in the remove function.

Fixes: 5b143d2a6ede ("bus: add driver for the Technologic Systems NBUS")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Not sure if we need the mutex_lock()/mutex_unlock() that is in the remove
function.
---
 drivers/bus/ts-nbus.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index 38c886dc2ed6..ed568061ba6b 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -324,11 +324,16 @@ static int ts_nbus_probe(struct platform_device *pdev)
 
 	ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
 	if (ret < 0)
-		return ret;
+		goto err_disable_pwm;
 
 	dev_info(dev, "initialized\n");
 
 	return 0;
+
+err_disable_pwm:
+	pwm_disable(pwm);
+	return ret;
+
 }
 
 static int ts_nbus_remove(struct platform_device *pdev)
-- 
2.34.1