From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-eopbgr690129.outbound.protection.outlook.com ([40.107.69.129]:53565 "EHLO NAM04-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729272AbeIGFQJ (ORCPT ); Fri, 7 Sep 2018 01:16:09 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Krzysztof Kozlowski , Sasha Levin Subject: [PATCH AUTOSEL 4.18 50/88] ARM: exynos: Clear global variable on init error path Date: Fri, 7 Sep 2018 00:36:29 +0000 Message-ID: <20180907003547.57567-50-alexander.levin@microsoft.com> References: <20180907003547.57567-1-alexander.levin@microsoft.com> In-Reply-To: <20180907003547.57567-1-alexander.levin@microsoft.com> Content-Language: en-US Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org List-ID: From: Krzysztof Kozlowski [ Upstream commit cd4806911cee3901bc2b5eb95603cf1958720b57 ] For most of Exynos SoCs, Power Management Unit (PMU) address space is mapped into global variable 'pmu_base_addr' very early when initializing PMU interrupt controller. A lot of other machine code depends on it so when doing iounmap() on this address, clear the global as well to avoid usage of invalid value (pointing to unmapped memory region). Properly mapped PMU address space is a requirement for all other machine code so this fix is purely theoretical. Boot will fail immediately in many other places after following this error path. Signed-off-by: Krzysztof Kozlowski Signed-off-by: Sasha Levin --- arch/arm/mach-exynos/suspend.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/mach-exynos/suspend.c b/arch/arm/mach-exynos/suspend.= c index f3384e3a675d..7ead3acd6fa4 100644 --- a/arch/arm/mach-exynos/suspend.c +++ b/arch/arm/mach-exynos/suspend.c @@ -203,6 +203,7 @@ static int __init exynos_pmu_irq_init(struct device_nod= e *node, NULL); if (!domain) { iounmap(pmu_base_addr); + pmu_base_addr =3D NULL; return -ENOMEM; } =20 --=20 2.17.1