From patchwork Tue Mar 17 01:14:02 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suman Anna X-Patchwork-Id: 6026801 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 8A5DDBF90F for ; Tue, 17 Mar 2015 01:14:38 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9445A20465 for ; Tue, 17 Mar 2015 01:14:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0A40320462 for ; Tue, 17 Mar 2015 01:14:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753151AbbCQBOe (ORCPT ); Mon, 16 Mar 2015 21:14:34 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:53368 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751495AbbCQBOc (ORCPT ); Mon, 16 Mar 2015 21:14:32 -0400 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by bear.ext.ti.com (8.13.7/8.13.7) with ESMTP id t2H1E8V5023068; Mon, 16 Mar 2015 20:14:08 -0500 Received: from DLEE70.ent.ti.com (dlemailx.itg.ti.com [157.170.170.113]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id t2H1E71S030043; Mon, 16 Mar 2015 20:14:07 -0500 Received: from dflp32.itg.ti.com (10.64.6.15) by DLEE70.ent.ti.com (157.170.170.113) with Microsoft SMTP Server id 14.3.224.2; Mon, 16 Mar 2015 20:14:07 -0500 Received: from legion.dal.design.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id t2H1E6CH026652; Mon, 16 Mar 2015 20:14:06 -0500 Received: from localhost (irmo.am.dhcp.ti.com [128.247.71.175]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id t2H1E6905818; Mon, 16 Mar 2015 20:14:06 -0500 (CDT) From: Suman Anna To: Tony Lindgren CC: Paul Walmsley , , , Suman Anna Subject: [PATCH 1/2] ARM: OMAP: dmtimer: check for pm_runtime_get_sync() failure Date: Mon, 16 Mar 2015 20:14:02 -0500 Message-ID: <1426554843-42641-2-git-send-email-s-anna@ti.com> X-Mailer: git-send-email 2.3.2 In-Reply-To: <1426554843-42641-1-git-send-email-s-anna@ti.com> References: <1426554843-42641-1-git-send-email-s-anna@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The current OMAP dmtimer probe does not check for the return status of pm_runtime_get_sync() before initializing the timer registers. Any timer with missing hwmod data would return a failure here, and the access of registers without enabling the clocks for the timer would trigger a l3_noc interrupt and a kernel boot hang. Add proper checking so that the probe would return a failure graciously without hanging the kernel boot. Signed-off-by: Suman Anna --- arch/arm/plat-omap/dmtimer.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c index db10169a08de..f32c74c0e1de 100644 --- a/arch/arm/plat-omap/dmtimer.c +++ b/arch/arm/plat-omap/dmtimer.c @@ -799,6 +799,7 @@ static int omap_dm_timer_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; const struct of_device_id *match; const struct dmtimer_platform_data *pdata; + int ret; match = of_match_device(of_match_ptr(omap_timer_match), dev); pdata = match ? match->data : dev->platform_data; @@ -860,7 +861,12 @@ static int omap_dm_timer_probe(struct platform_device *pdev) } if (!timer->reserved) { - pm_runtime_get_sync(dev); + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + dev_err(dev, "%s: pm_runtime_get_sync failed!\n", + __func__); + goto err_get_sync; + } __omap_dm_timer_init_regs(timer); pm_runtime_put(dev); } @@ -873,6 +879,11 @@ static int omap_dm_timer_probe(struct platform_device *pdev) dev_dbg(dev, "Device Probed.\n"); return 0; + +err_get_sync: + pm_runtime_put_noidle(dev); + pm_runtime_disable(dev); + return ret; } /**