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From:   Nicholas Mc Guire <hofrat@osadl.org>
To:     Russell King <linux@armlinux.org.uk>
Cc:     Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Mark Brown <broonie@kernel.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Tony Lindgren <tony@atomide.com>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Janusz Krzysztofik <jmkrzyszt@gmail.com>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Nicholas Mc Guire <hofrat@osadl.org>
Subject: [PATCH] ARM: imx: flag failure of of_iomap
Date:   Sat, 13 Apr 2019 09:14:16 +0200
Message-Id: <1555139666-948-5-git-send-email-hofrat@osadl.org>
In-Reply-To: <1555139666-948-1-git-send-email-hofrat@osadl.org>
References: <1555139666-948-1-git-send-email-hofrat@osadl.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

 imx_set_aips is assuming that the address returned from of_iomap is
valid which it probably is in the normal case - as the call site
is void error propagation is not possible but never the less at least
a WARN_ON() seems warranted here.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Fixes: commit e57e4ab5fc2e ("ARM: i.MX: allow disabling supervisor protect via DT")
---

Problem found by experimental coccinelle script

Patch was compiletested with: multi_v7_defconfig

Patch is against 4.18-rc3 (localversion-next is next-20180706)

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

diff --git a/arch/arm/mach-imx/cpu.c b/arch/arm/mach-imx/cpu.c
index 32969f3..c6b1bf9 100644
--- a/arch/arm/mach-imx/cpu.c
+++ b/arch/arm/mach-imx/cpu.c
@@ -68,6 +68,7 @@ void __init imx_aips_allow_unprivileged_access(
 
 	for_each_compatible_node(np, NULL, compat) {
 		aips_base_addr = of_iomap(np, 0);
+		WARN_ON(!aips_base_addr);
 		imx_set_aips(aips_base_addr);
 	}
 }
-- 
2.1.4