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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham 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 2A5E1C282D7 for ; Mon, 11 Feb 2019 14:36:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EB47E20818 for ; Mon, 11 Feb 2019 14:36:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549895771; bh=Vilx8GI8ueITy7jDbmBjappZ0vR0zwaIrKWHeARmOB0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SZkXpOatEhgfKzWzHKsI3Asc0Etmfe64xzAQZm3fUGIGKMCYW7KSHfNcbBjsSFJce 6pQFzMpQf2qRmIDVL1r6Z9q8e75HcB1yav8P4Rcmw+JnkfkSpRUoOMwedEIzDCMk/S 8AXAZz73xv/dbYtp6up85FeFUHxDbb2rJWBOVHDs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731199AbfBKOgJ (ORCPT ); Mon, 11 Feb 2019 09:36:09 -0500 Received: from mail.kernel.org ([198.145.29.99]:45090 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730621AbfBKOgH (ORCPT ); Mon, 11 Feb 2019 09:36:07 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 093082080F; Mon, 11 Feb 2019 14:36:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549895766; bh=Vilx8GI8ueITy7jDbmBjappZ0vR0zwaIrKWHeARmOB0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=B/FAP0DEiHor2YOn+pESbVkI0A38DAuwBQnuPL6bsQ2rSfk42COt0hI5gOgKqQ4bI 2JN2/dcG2UFjZb9CficaJ2itFxPSp1uIxi62zppKGKn3eByeQY19X89C6V04GUYxIz 0gDKBnrLO3wD+W26CkPrhyJTp7+AAXeGMEt2XMRI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Takashi Iwai Subject: [PATCH 4.20 316/352] ALSA: hda - Serialize codec registrations Date: Mon, 11 Feb 2019 15:19:03 +0100 Message-Id: <20190211141906.933743929@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141846.543045703@linuxfoundation.org> References: <20190211141846.543045703@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore 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 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Takashi Iwai commit 305a0ade180981686eec1f92aa6252a7c6ebb1cf upstream. In the current code, the codec registration may happen both at the codec bind time and the end of the controller probe time. In a rare occasion, they race with each other, leading to Oops due to the still uninitialized card device. This patch introduces a simple flag to prevent the codec registration at the codec bind time as long as the controller probe is going on. The controller probe invokes snd_card_register() that does the whole registration task, and we don't need to register each piece beforehand. Cc: Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- include/sound/hda_codec.h | 1 + sound/pci/hda/hda_bind.c | 3 ++- sound/pci/hda/hda_intel.c | 2 ++ 3 files changed, 5 insertions(+), 1 deletion(-) --- a/include/sound/hda_codec.h +++ b/include/sound/hda_codec.h @@ -68,6 +68,7 @@ struct hda_bus { unsigned int response_reset:1; /* controller was reset */ unsigned int in_reset:1; /* during reset operation */ unsigned int no_response_fallback:1; /* don't fallback at RIRB error */ + unsigned int bus_probing :1; /* during probing process */ int primary_dig_out_type; /* primary digital out PCM type */ unsigned int mixer_assigned; /* codec addr for mixer name */ --- a/sound/pci/hda/hda_bind.c +++ b/sound/pci/hda/hda_bind.c @@ -115,7 +115,8 @@ static int hda_codec_driver_probe(struct err = snd_hda_codec_build_controls(codec); if (err < 0) goto error_module; - if (codec->card->registered) { + /* only register after the bus probe finished; otherwise it's racy */ + if (!codec->bus->bus_probing && codec->card->registered) { err = snd_card_register(codec->card); if (err < 0) goto error_module; --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -2228,6 +2228,7 @@ static int azx_probe_continue(struct azx int dev = chip->dev_index; int err; + to_hda_bus(bus)->bus_probing = 1; hda->probe_continued = 1; /* bind with i915 if needed */ @@ -2323,6 +2324,7 @@ i915_power_fail: if (err < 0) hda->init_failed = 1; complete_all(&hda->probe_wait); + to_hda_bus(bus)->bus_probing = 0; return err; }