From patchwork Tue Mar 23 22:38:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suman Anna X-Patchwork-Id: 12159815 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 4C4B6C433E5 for ; Tue, 23 Mar 2021 22:39:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 196F3619E6 for ; Tue, 23 Mar 2021 22:39:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234023AbhCWWj3 (ORCPT ); Tue, 23 Mar 2021 18:39:29 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:34642 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233941AbhCWWiy (ORCPT ); Tue, 23 Mar 2021 18:38:54 -0400 Received: from fllv0034.itg.ti.com ([10.64.40.246]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 12NMcilg068332; Tue, 23 Mar 2021 17:38:44 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1616539124; bh=dcG1K7rIEgxuPcS6umlxbj2JzxAoNQrfLADmWxfGAFw=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=p1ZZjWgCX5gPUtdaQaml8O/Nq4Tc9eNahF0a3rfNIsJ7Y83ETHjq3cOcB6k8YyR0c wL3E4fn58tdh8lmHoS2jmNQFMmd9NdTkh1xj4QlVZeW9G3Gp5jcsDpDb6n31//HKNh DqZUTEp/5Owl51UMJRx8DGFN8a/q/IGdp4z8oOVk= Received: from DLEE110.ent.ti.com (dlee110.ent.ti.com [157.170.170.21]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 12NMcifE046601 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 23 Mar 2021 17:38:44 -0500 Received: from DLEE102.ent.ti.com (157.170.170.32) by DLEE110.ent.ti.com (157.170.170.21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Tue, 23 Mar 2021 17:38:43 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DLEE102.ent.ti.com (157.170.170.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2 via Frontend Transport; Tue, 23 Mar 2021 17:38:43 -0500 Received: from lelv0597.itg.ti.com (lelv0597.itg.ti.com [10.181.64.32]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 12NMchZc039063; Tue, 23 Mar 2021 17:38:43 -0500 Received: from localhost ([10.250.221.195]) by lelv0597.itg.ti.com (8.14.7/8.14.7) with ESMTP id 12NMchSa102222; Tue, 23 Mar 2021 17:38:43 -0500 From: Suman Anna To: Bjorn Andersson , Mathieu Poirier CC: Grzegorz Jaszczyk , Jan Kiszka , Vignesh Raghavendra , Lokesh Vutla , , , , Subject: [PATCH 3/3] remoteproc: pru: Fix and cleanup firmware interrupt mapping logic Date: Tue, 23 Mar 2021 17:38:39 -0500 Message-ID: <20210323223839.17464-4-s-anna@ti.com> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210323223839.17464-1-s-anna@ti.com> References: <20210323223839.17464-1-s-anna@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org The PRU firmware interrupt mappings are configured and unconfigured in .start() and .stop() callbacks respectively using the variables 'evt_count' and a 'mapped_irq' pointer. These variables are modified only during these callbacks but are not re-initialized/reset properly during unwind or failure paths. These stale values caused a kernel crash while stopping a PRU remoteproc running a different firmware with no events on a subsequent run after a previous run that was running a firmware with events. Fix this crash by ensuring that the evt_count is 0 and the mapped_irq pointer is set to NULL in pru_dispose_irq_mapping(). Also, reset these variables properly during any failures in the .start() callback. While at this, the pru_dispose_irq_mapping() callsites are all made to look the same, moving any conditional logic to inside the function. Fixes: c75c9fdac66e ("remoteproc: pru: Add support for PRU specific interrupt configuration") Reported-by: Vignesh Raghavendra Signed-off-by: Suman Anna --- drivers/remoteproc/pru_rproc.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c index 87b43976c51b..5df19acb90ed 100644 --- a/drivers/remoteproc/pru_rproc.c +++ b/drivers/remoteproc/pru_rproc.c @@ -266,12 +266,17 @@ static void pru_rproc_create_debug_entries(struct rproc *rproc) static void pru_dispose_irq_mapping(struct pru_rproc *pru) { - while (pru->evt_count--) { + if (!pru->mapped_irq) + return; + + while (pru->evt_count) { + pru->evt_count--; if (pru->mapped_irq[pru->evt_count] > 0) irq_dispose_mapping(pru->mapped_irq[pru->evt_count]); } kfree(pru->mapped_irq); + pru->mapped_irq = NULL; } /* @@ -324,6 +329,8 @@ static int pru_handle_intrmap(struct rproc *rproc) of_node_put(parent); if (!irq_parent) { kfree(pru->mapped_irq); + pru->mapped_irq = NULL; + pru->evt_count = 0; return -ENODEV; } @@ -398,8 +405,7 @@ static int pru_rproc_stop(struct rproc *rproc) pru_control_write_reg(pru, PRU_CTRL_CTRL, val); /* dispose irq mapping - new firmware can provide new mapping */ - if (pru->mapped_irq) - pru_dispose_irq_mapping(pru); + pru_dispose_irq_mapping(pru); return 0; }