From patchwork Tue Jun 11 10:11:18 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tuomas Tynkkynen X-Patchwork-Id: 250520 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 04D522C0092 for ; Tue, 11 Jun 2013 20:11:53 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753035Ab3FKKLv (ORCPT ); Tue, 11 Jun 2013 06:11:51 -0400 Received: from hqemgate04.nvidia.com ([216.228.121.35]:1334 "EHLO hqemgate04.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752504Ab3FKKLv (ORCPT ); Tue, 11 Jun 2013 06:11:51 -0400 Received: from hqnvupgp08.nvidia.com (Not Verified[216.228.121.13]) by hqemgate04.nvidia.com id ; Tue, 11 Jun 2013 03:11:42 -0700 Received: from hqemhub02.nvidia.com ([172.20.12.94]) by hqnvupgp08.nvidia.com (PGP Universal service); Tue, 11 Jun 2013 03:11:29 -0700 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Tue, 11 Jun 2013 03:11:29 -0700 Received: from ttynkkynen-lnx.Nvidia.com (172.20.144.16) by hqemhub02.nvidia.com (172.20.150.31) with Microsoft SMTP Server (TLS) id 8.3.298.1; Tue, 11 Jun 2013 03:11:28 -0700 From: Tuomas Tynkkynen To: CC: , , , Tuomas Tynkkynen Subject: [PATCH 1/2] memory: tegra20-mc: Fix hang in IRQ handler. Date: Tue, 11 Jun 2013 13:11:18 +0300 Message-ID: <1370945479-2917-2-git-send-email-ttynkkynen@nvidia.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: <1370945479-2917-1-git-send-email-ttynkkynen@nvidia.com> References: <1370945479-2917-1-git-send-email-ttynkkynen@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org In Tegra20 any memory controller interrupt would cause an infinite loop in the IRQ handler. Signed-off-by: Tuomas Tynkkynen --- drivers/memory/tegra20-mc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/memory/tegra20-mc.c b/drivers/memory/tegra20-mc.c index 2ca5f28..0548eea 100644 --- a/drivers/memory/tegra20-mc.c +++ b/drivers/memory/tegra20-mc.c @@ -193,8 +193,11 @@ static irqreturn_t tegra20_mc_isr(int irq, void *data) mask &= stat; if (!mask) return IRQ_NONE; - while ((bit = ffs(mask)) != 0) + while ((bit = ffs(mask)) != 0) { tegra20_mc_decode(mc, bit - 1); + mask &= ~BIT(bit - 1); + } + mc_writel(mc, stat, MC_INTSTATUS); return IRQ_HANDLED; }