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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 A3B03C3F341 for ; Thu, 27 Feb 2020 13:50:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 78D5D246A0 for ; Thu, 27 Feb 2020 13:50:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582811438; bh=dFBHdpTmb1pYHeFIPv7bP54uozuvvZ1+7N/kxCsJCKQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=m7oSh8IzjjqxQ4X/qbbaUvWGBjgWX5WGv0DHSUBip5a9L7xw9AXAtAjM55p+2q+la OPLx3KMjiWnYa2SG1enEZPAC3eXZ1knaIHxq8OzEeT8Qu0WDrH1tzFHK0AGREcrAW5 hFoP/Llr1uPhNfcl95I8h1gPDiCfY5sbIpx6C2u4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731259AbgB0Nuh (ORCPT ); Thu, 27 Feb 2020 08:50:37 -0500 Received: from mail.kernel.org ([198.145.29.99]:48436 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731237AbgB0Nu3 (ORCPT ); Thu, 27 Feb 2020 08:50:29 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6478621D7E; Thu, 27 Feb 2020 13:50:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582811427; bh=dFBHdpTmb1pYHeFIPv7bP54uozuvvZ1+7N/kxCsJCKQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C/9d2ndL2/BReFLLUiJVAUjghJWn1H2gJAO/JSiyY5/inBsP6qi9bCfG5zH5A+hcI AGtca4xE9Ki24oQ8gogcpwDm2fpr6eqHbvhIiRnG0DBPTLL8PsxZvwp2MVoIkdsW5v C0rah3Rf23Q+n4fqGU6tClmhH7LcD0HboMWK8Usk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Brandon Maier , Bjorn Andersson , Sasha Levin Subject: [PATCH 4.9 090/165] remoteproc: Initialize rproc_class before use Date: Thu, 27 Feb 2020 14:36:04 +0100 Message-Id: <20200227132244.450160696@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200227132230.840899170@linuxfoundation.org> References: <20200227132230.840899170@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Brandon Maier [ Upstream commit a8f40111d184098cd2b3dc0c7170c42250a5fa09 ] The remoteproc_core and remoteproc drivers all initialize with module_init(). However remoteproc drivers need the rproc_class during their probe. If one of the remoteproc drivers runs init and gets through probe before remoteproc_init() runs, a NULL pointer access of rproc_class's `glue_dirs` spinlock occurs. > Unable to handle kernel NULL pointer dereference at virtual address 000000dc > pgd = c0004000 > [000000dc] *pgd=00000000 > Internal error: Oops: 5 [#1] PREEMPT ARM > Modules linked in: > CPU: 0 PID: 1 Comm: swapper Tainted: G W 4.14.106-rt56 #1 > Hardware name: Generic OMAP36xx (Flattened Device Tree) > task: c6050000 task.stack: c604a000 > PC is at rt_spin_lock+0x40/0x6c > LR is at rt_spin_lock+0x28/0x6c > pc : [] lr : [] psr: 60000013 > sp : c604bdc0 ip : 00000000 fp : 00000000 > r10: 00000000 r9 : c61c7c10 r8 : c6269c20 > r7 : c0905888 r6 : c6269c20 r5 : 00000000 r4 : 000000d4 > r3 : 000000dc r2 : c6050000 r1 : 00000002 r0 : 000000d4 > Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none ... > [] (rt_spin_lock) from [] (get_device_parent+0x54/0x17c) > [] (get_device_parent) from [] (device_add+0xe0/0x5b4) > [] (device_add) from [] (rproc_add+0x18/0xd8) > [] (rproc_add) from [] (my_rproc_probe+0x158/0x204) > [] (my_rproc_probe) from [] (platform_drv_probe+0x34/0x70) > [] (platform_drv_probe) from [] (driver_probe_device+0x2c8/0x420) > [] (driver_probe_device) from [] (__driver_attach+0x100/0x11c) > [] (__driver_attach) from [] (bus_for_each_dev+0x7c/0xc0) > [] (bus_for_each_dev) from [] (bus_add_driver+0x1cc/0x264) > [] (bus_add_driver) from [] (driver_register+0x78/0xf8) > [] (driver_register) from [] (do_one_initcall+0x100/0x190) > [] (do_one_initcall) from [] (kernel_init_freeable+0x130/0x1d0) > [] (kernel_init_freeable) from [] (kernel_init+0x8/0x114) > [] (kernel_init) from [] (ret_from_fork+0x14/0x24) > Code: e2843008 e3c2203f f5d3f000 e5922010 (e193cf9f) > ---[ end trace 0000000000000002 ]--- Signed-off-by: Brandon Maier Link: https://lore.kernel.org/r/20190530225223.136420-1-brandon.maier@rockwellcollins.com Signed-off-by: Bjorn Andersson Signed-off-by: Sasha Levin --- drivers/remoteproc/remoteproc_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index c6bfb3496684e..b99780574044a 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -1488,7 +1488,7 @@ static int __init remoteproc_init(void) return 0; } -module_init(remoteproc_init); +subsys_initcall(remoteproc_init); static void __exit remoteproc_exit(void) { -- 2.20.1