linux-kernel - [PATCH] ARM: STi: at least warn if of

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Date:   Sat, 13 Apr 2019 09:14:18 +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] ARM: STi: at least warn if of_iomap fails

The call to of_iomap() is unchecked but scu_enable(), which the returned
address is passed on to, assumes a valid mapping. If the mapping is
invalid this could probably lead to undefined system state so at least
a warning should be issued.

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
Fixes: commit 65ebcc115889 ("ARM: sti: Add STiH415 SOC support")
---
Problem was found by an experimental coccinelle script

Patch was compile tested with: multi_v7_defconfig (implies
CONFIG_ARCH_STI=y, CONFIG_SMP=y)

Patch is against 4.18-rc3 (localversion-next is next-20180712)

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

diff --git a/arch/arm/mach-sti/platsmp.c b/arch/arm/mach-sti/platsmp.c
index 231f19e..89ae76f 100644
--- a/arch/arm/mach-sti/platsmp.c
+++ b/arch/arm/mach-sti/platsmp.c
@@ -109,6 +109,7 @@ static void __init sti_smp_prepare_cpus(unsigned int max_cpus)
 
 	if (np) {
 		scu_base = of_iomap(np, 0);
+		WARN_ON(!scu_base);
 		scu_enable(scu_base);
 		of_node_put(np);
 	}
-- 
2.1.4