linux-kernel - [PATCH] ARM: OMAP1: ams-delta: fix early boot crash when LED support is disabled

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Message-Id: <20190415233732.3612-1-aaro.koskinen@iki.fi>
Date:   Tue, 16 Apr 2019 02:37:32 +0300
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
        Janusz Krzysztofik <jmkrzyszt@...il.com>,
        Pavel Machek <pavel@....cz>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Aaro Koskinen <aaro.koskinen@....fi>
Subject: [PATCH] ARM: OMAP1: ams-delta: fix early boot crash when LED support is disabled

When we boot with the LED support (CONFIG_NEW_LEDS) disabled,
gpio_led_register_device() will return a NULL pointer and we try
to dereference it. Fix by checking also for a NULL pointer.

Fixes: 19a2668a8ae3 ("ARM: OMAP1: ams-delta: Provide GPIO lookup table for LED device")
Signed-off-by: Aaro Koskinen <aaro.koskinen@....fi>
---
 arch/arm/mach-omap1/board-ams-delta.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
index c4c0a8ea11e4..2b3d1197bb19 100644
--- a/arch/arm/mach-omap1/board-ams-delta.c
+++ b/arch/arm/mach-omap1/board-ams-delta.c
@@ -749,7 +749,7 @@ static void __init ams_delta_init(void)
 				ARRAY_SIZE(ams_delta_gpio_tables));
 
 	leds_pdev = gpio_led_register_device(PLATFORM_DEVID_NONE, &leds_pdata);
-	if (!IS_ERR(leds_pdev)) {
+	if (!IS_ERR_OR_NULL(leds_pdev)) {
 		leds_gpio_table.dev_id = dev_name(&leds_pdev->dev);
 		gpiod_add_lookup_table(&leds_gpio_table);
 	}
-- 
2.17.0