linux-kernel - [PATCH] leds: trigger: gpio: Avoid warning on update of inverted

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <d560d3eb-774d-8d9f-a8e3-09c371fc03eb@web.de>
Date:   Sat, 13 Jun 2020 09:15:06 +0200
From:   Jan Kiszka <jan.kiszka@....de>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>
Cc:     linux-leds@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] leds: trigger: gpio: Avoid warning on update of inverted

From: Jan Kiszka <jan.kiszka@...mens.com>

If the GPIO has not been configured yet, writing to inverted will raise
a kernel warning.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 drivers/leds/trigger/ledtrig-gpio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/trigger/ledtrig-gpio.c b/drivers/leds/trigger/ledtrig-gpio.c
index dc64679b1a92..0120faa3dafa 100644
--- a/drivers/leds/trigger/ledtrig-gpio.c
+++ b/drivers/leds/trigger/ledtrig-gpio.c
@@ -99,7 +99,8 @@ static ssize_t gpio_trig_inverted_store(struct device *dev,
 	gpio_data->inverted = inverted;

 	/* After inverting, we need to update the LED. */
-	gpio_trig_irq(0, led);
+	if (gpio_is_valid(gpio_data->gpio))
+		gpio_trig_irq(0, led);

 	return n;
 }
--
2.26.2