From patchwork Tue Oct 6 16:17:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai Vehmanen X-Patchwork-Id: 11818987 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1636959D for ; Tue, 6 Oct 2020 16:30:11 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E25E4206F7 for ; Tue, 6 Oct 2020 16:30:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E25E4206F7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1475A6E21B; Tue, 6 Oct 2020 16:30:10 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id 68F1C6E21B; Tue, 6 Oct 2020 16:30:08 +0000 (UTC) IronPort-SDR: X2S7Xni4Czr8+Vnj2LGhBiRFbbE9pXIshv1On9yfcnrdb+ia0fGGNcvCwAPf/LMp8McS9ucics ImAIErkBH0xA== X-IronPort-AV: E=McAfee;i="6000,8403,9765"; a="151491155" X-IronPort-AV: E=Sophos;i="5.77,343,1596524400"; d="scan'208";a="151491155" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Oct 2020 09:19:45 -0700 IronPort-SDR: rykPb+F00eOIYzeQ87BYpQocUltM8yEEajjSDyj1Nm5O8tCPOAI6GlKp2JR9zlnMJJlExydZMi LOsAllcW2TdQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,343,1596524400"; d="scan'208";a="327619123" Received: from eliteleevi.tm.intel.com ([10.237.54.20]) by orsmga002.jf.intel.com with ESMTP; 06 Oct 2020 09:19:40 -0700 From: Kai Vehmanen To: tiwai@suse.de, alsa-devel@alsa-project.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@linux.ie, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, jani.nikula@intel.com Date: Tue, 6 Oct 2020 19:17:22 +0300 Message-Id: <20201006161722.500256-1-kai.vehmanen@linux.intel.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH] ALSA: hda/i915 - fix list corruption with concurrent probes X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Takashi Iwai Current hdac_i915 uses a static completion instance to wait for i915 driver to complete the component bind. This design is not safe if multiple HDA controllers are active and communicating with different i915 instances, and can lead to list corruption and failed audio driver probe. Fix the design by moving completion mechanism to common acomp code and remove the related code from hdac_i915. Co-developed-by: Kai Vehmanen Signed-off-by: Kai Vehmanen Signed-off-by: Takashi Iwai --- include/drm/drm_audio_component.h | 4 ++++ sound/hda/hdac_component.c | 3 +++ sound/hda/hdac_i915.c | 23 +++-------------------- 3 files changed, 10 insertions(+), 20 deletions(-) diff --git a/include/drm/drm_audio_component.h b/include/drm/drm_audio_component.h index a45f93487039..0d36bfd1a4cd 100644 --- a/include/drm/drm_audio_component.h +++ b/include/drm/drm_audio_component.h @@ -117,6 +117,10 @@ struct drm_audio_component { * @audio_ops: Ops implemented by hda driver, called by DRM driver */ const struct drm_audio_component_audio_ops *audio_ops; + /** + * @master_bind_complete: completion held during component master binding + */ + struct completion master_bind_complete; }; #endif /* _DRM_AUDIO_COMPONENT_H_ */ diff --git a/sound/hda/hdac_component.c b/sound/hda/hdac_component.c index 89126c6fd216..bb37e7e0bd79 100644 --- a/sound/hda/hdac_component.c +++ b/sound/hda/hdac_component.c @@ -210,12 +210,14 @@ static int hdac_component_master_bind(struct device *dev) goto module_put; } + complete_all(&acomp->master_bind_complete); return 0; module_put: module_put(acomp->ops->owner); out_unbind: component_unbind_all(dev, acomp); + complete_all(&acomp->master_bind_complete); return ret; } @@ -296,6 +298,7 @@ int snd_hdac_acomp_init(struct hdac_bus *bus, if (!acomp) return -ENOMEM; acomp->audio_ops = aops; + init_completion(&acomp->master_bind_complete); bus->audio_component = acomp; devres_add(dev, acomp); diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c index 5f0a1aa6ad84..454474ac5716 100644 --- a/sound/hda/hdac_i915.c +++ b/sound/hda/hdac_i915.c @@ -11,8 +11,6 @@ #include #include -static struct completion bind_complete; - #define IS_HSW_CONTROLLER(pci) (((pci)->device == 0x0a0c) || \ ((pci)->device == 0x0c0c) || \ ((pci)->device == 0x0d0c) || \ @@ -130,19 +128,6 @@ static bool i915_gfx_present(void) return pci_dev_present(ids); } -static int i915_master_bind(struct device *dev, - struct drm_audio_component *acomp) -{ - complete_all(&bind_complete); - /* clear audio_ops here as it was needed only for completion call */ - acomp->audio_ops = NULL; - return 0; -} - -static const struct drm_audio_component_audio_ops i915_init_ops = { - .master_bind = i915_master_bind -}; - /** * snd_hdac_i915_init - Initialize i915 audio component * @bus: HDA core bus @@ -163,9 +148,7 @@ int snd_hdac_i915_init(struct hdac_bus *bus) if (!i915_gfx_present()) return -ENODEV; - init_completion(&bind_complete); - - err = snd_hdac_acomp_init(bus, &i915_init_ops, + err = snd_hdac_acomp_init(bus, NULL, i915_component_master_match, sizeof(struct i915_audio_component) - sizeof(*acomp)); if (err < 0) @@ -177,8 +160,8 @@ int snd_hdac_i915_init(struct hdac_bus *bus) if (!IS_ENABLED(CONFIG_MODULES) || !request_module("i915")) { /* 60s timeout */ - wait_for_completion_timeout(&bind_complete, - msecs_to_jiffies(60 * 1000)); + wait_for_completion_timeout(&acomp->master_bind_complete, + msecs_to_jiffies(60 * 1000)); } } if (!acomp->ops) {