From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF6D7C35242 for ; Fri, 24 Jan 2020 14:24:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BC22C222C2 for ; Fri, 24 Jan 2020 14:24:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579875857; bh=l6cloJhamHOBRbigpyNLbKO8rrDSvstEKce5/7sOMOc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=AH5AU1YsxDrxLt8ljH4THgyaHDYakw2J8yznahAKBYjT4DjldfurQE3EEA5xJQdgB QI6LJmki8555MuaeaGQBnrmcEEcRjDBsrjCk/TByatmnWMLHkLngu6nbHDXIIiZ85P AZ2BbLlB/SYpcpQbDxg204FOk+HeV6Pt4tuJHbYo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392306AbgAXOWL (ORCPT ); Fri, 24 Jan 2020 09:22:11 -0500 Received: from mail.kernel.org ([198.145.29.99]:44116 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727295AbgAXOWE (ORCPT ); Fri, 24 Jan 2020 09:22:04 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 01A7524673; Fri, 24 Jan 2020 14:22:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579875723; bh=l6cloJhamHOBRbigpyNLbKO8rrDSvstEKce5/7sOMOc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z38zTaHl9FJtyGRSKUPiNElLf8FiWARhGO0XY4H2DrxTNS1NAuylGK49/3nMQ9DF9 K/1bWH0s7b8OrdK6YD5g6nlQH/kvknFE98cpC9E+Bxtl3xPeiSCDacHfRs1GH5+fsD gBTw52PSXcvQ7U+Pi0IqG05sJ76I4N/dmSlzMdGQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Dave Gerlach , Suman Anna , Santosh Shilimkar , Tony Lindgren , Sasha Levin , linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 4.9 04/18] soc: ti: wkup_m3_ipc: Fix race condition with rproc_boot Date: Fri, 24 Jan 2020 09:21:43 -0500 Message-Id: <20200124142157.30931-4-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200124142157.30931-1-sashal@kernel.org> References: <20200124142157.30931-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dave Gerlach [ Upstream commit 03729cfa0d543bc996bf959e762ec999afc8f3d2 ] Any user of wkup_m3_ipc calls wkup_m3_ipc_get to get a handle and this checks the value of the static variable m3_ipc_state to see if the wkup_m3 is ready. Currently this is populated during probe before rproc_boot has been called, meaning there is a window of time that wkup_m3_ipc_get can return a valid handle but the wkup_m3 itself is not ready, leading to invalid IPC calls to the wkup_m3 and system instability. To avoid this, move the population of the m3_ipc_state variable until after rproc_boot has succeeded to guarantee a valid and usable handle is always returned. Reported-by: Suman Anna Signed-off-by: Dave Gerlach Acked-by: Santosh Shilimkar Signed-off-by: Tony Lindgren Signed-off-by: Sasha Levin --- drivers/soc/ti/wkup_m3_ipc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/soc/ti/wkup_m3_ipc.c b/drivers/soc/ti/wkup_m3_ipc.c index 5bb376009d98b..fc33bfdc957cc 100644 --- a/drivers/soc/ti/wkup_m3_ipc.c +++ b/drivers/soc/ti/wkup_m3_ipc.c @@ -377,6 +377,8 @@ static void wkup_m3_rproc_boot_thread(struct wkup_m3_ipc *m3_ipc) ret = rproc_boot(m3_ipc->rproc); if (ret) dev_err(dev, "rproc_boot failed\n"); + else + m3_ipc_state = m3_ipc; do_exit(0); } @@ -463,8 +465,6 @@ static int wkup_m3_ipc_probe(struct platform_device *pdev) goto err_put_rproc; } - m3_ipc_state = m3_ipc; - return 0; err_put_rproc: -- 2.20.1