From patchwork Wed Jul 20 12:15:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrzej Hajda X-Patchwork-Id: 12923871 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id A12A5C43334 for ; Wed, 20 Jul 2022 12:16:35 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7935612A5F9; Wed, 20 Jul 2022 12:16:05 +0000 (UTC) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4CD6512A2C4; Wed, 20 Jul 2022 12:15:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1658319345; x=1689855345; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=cnGW971gTKAjs5K8BebO0eDFgVCDB9gEsxUcT1skyLQ=; b=Mf+XIzEAPElRrM+q0NMFQMUViZz3MQHZ16dneyNjnBEIxqbI+ecJQHqm seczSx4ybvsNwt27BU3Frs0kwlhhiV7SXUNtjprOA/2FuSxjbs3xqWvyI Vq1RpPm+7iDwuQZWAUP6Yb8kVC3HV0cg54XiBx/vFYkkqEGhnEaDxVdv0 5Ls71Bi7E91RyExIPsW7u4Ku8nxECzmfrcxYHnqgLHSVt+kiDLaIcGokj 5YQ9iHw4kp9/cfT8DdCngbGv5S71Qc/qIDeqQ+uXRqNq1D/U58d+9MFCf NVXUnXrlYOZ4XYfaXjUsiZQZ7aJHr9LNPPRC8WGjtXjUr3EHnkjfjC8gq A==; X-IronPort-AV: E=McAfee;i="6400,9594,10413"; a="273598879" X-IronPort-AV: E=Sophos;i="5.92,286,1650956400"; d="scan'208";a="273598879" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jul 2022 05:15:44 -0700 X-IronPort-AV: E=Sophos;i="5.92,286,1650956400"; d="scan'208";a="573280118" Received: from lab-ah.igk.intel.com ([10.91.215.196]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jul 2022 05:15:42 -0700 From: Andrzej Hajda To: Jani Nikula , =?utf-8?b?VmlsbGUgU3lyasOk?= =?utf-8?b?bMOk?= , Arun R Murthy Subject: [PATCH v4 2/3] drm/i915/fbdev: suspend HPD before fbdev unregistration Date: Wed, 20 Jul 2022 14:15:07 +0200 Message-Id: <20220720121508.1202750-3-andrzej.hajda@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220720121508.1202750-1-andrzej.hajda@intel.com> References: <20220720121508.1202750-1-andrzej.hajda@intel.com> MIME-Version: 1.0 Organization: Intel Technology Poland sp. z o.o. - ul. Slowackiego 173, 80-298 Gdansk - KRS 101882 - NIP 957-07-52-316 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tvrtko Ursulin , Andrzej Hajda , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Rodrigo Vivi Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" HPD event after fbdev unregistration can cause registration of deferred fbdev which will not be unregistered later, causing use-after-free. To avoid it HPD handling should be suspended before fbdev unregistration. It should fix following GPF: [272.634530] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b6b6b: 0000 [#1] PREEMPT SMP NOPTI [272.634536] CPU: 0 PID: 6030 Comm: i915_selftest Tainted: G U 5.18.0-rc5-CI_DRM_11603-g12dccf4f5eef+ #1 [272.634541] Hardware name: Intel Corporation Raptor Lake Client Platform/RPL-S ADP-S DDR5 UDIMM CRB, BIOS RPLSFWI1.R00.2397.A01.2109300731 09/30/2021 [272.634545] RIP: 0010:fb_do_apertures_overlap.part.14+0x26/0x60 ... [272.634582] Call Trace: [272.634583] [272.634585] do_remove_conflicting_framebuffers+0x59/0xa0 [272.634589] remove_conflicting_framebuffers+0x2d/0xc0 [272.634592] remove_conflicting_pci_framebuffers+0xc8/0x110 [272.634595] drm_aperture_remove_conflicting_pci_framebuffers+0x52/0x70 [272.634604] i915_driver_probe+0x63a/0xdd0 [i915] Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5329 Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5510 Signed-off-by: Andrzej Hajda Reviewed-by: Arun R Murthy --- drivers/gpu/drm/i915/display/intel_fbdev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c index 221336178991f0..b682fd72d4bf25 100644 --- a/drivers/gpu/drm/i915/display/intel_fbdev.c +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c @@ -573,7 +573,8 @@ void intel_fbdev_unregister(struct drm_i915_private *dev_priv) if (!ifbdev) return; - cancel_work_sync(&dev_priv->fbdev_suspend_work); + intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true); + if (!current_is_async()) intel_fbdev_sync(ifbdev);