linux-kernel - [PATCH 1/4 RFC] ARM: imx legacy: warn on failed allocation

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Message-Id: <1555139666-948-6-git-send-email-hofrat@osadl.org>
Date:   Sat, 13 Apr 2019 09:14:17 +0200
From:   Nicholas Mc Guire <hofrat@...dl.org>
To:     Russell King <linux@...linux.org.uk>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Tony Lindgren <tony@...mide.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Janusz Krzysztofik <jmkrzyszt@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH 1/4 RFC] ARM: imx legacy: warn on failed allocation

Even in init the allocation can fail and thus should at least warn so
that the cause can be identified.

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
---

Problem located with an experimental coccinelle script

Note sure if there is a better solution as this is early in the boot
process so not that could be done anyway but fuss - anyway unchecked
allocation is not a good thing.

Patch was compile-tested with: imx_v4_v5_defconfig (implies
CONFIG_MACH_MX27ADS=y)
(with some unrelated sparse warnings about unimplemented syscalls
 and a few checkpatch warnings - covered in the other patches)

Patch is against 5.1-rc4 (localversion-next is 20190412)

 arch/arm/mach-imx/mach-mx27ads.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-imx/mach-mx27ads.c b/arch/arm/mach-imx/mach-mx27ads.c
index 6dd7f57..528846f 100644
--- a/arch/arm/mach-imx/mach-mx27ads.c
+++ b/arch/arm/mach-imx/mach-mx27ads.c
@@ -247,6 +247,7 @@ static void __init mx27ads_regulator_init(void)
 	struct gpio_chip *vchip;
 
 	vchip = kzalloc(sizeof(*vchip), GFP_KERNEL);
+	WARN_ON(!vchip);
 	vchip->owner		= THIS_MODULE;
 	vchip->label		= "LCD";
 	vchip->base		= MX27ADS_LCD_GPIO;
-- 
2.1.4