From patchwork Tue Oct 21 10:47:28 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Dheeraj Jamwal X-Patchwork-Id: 5115481 Return-Path: X-Original-To: patchwork-ltsi-dev@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 5AAE49F349 for ; Tue, 21 Oct 2014 11:18:53 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 75326200FE for ; Tue, 21 Oct 2014 11:18:52 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 91E1E2010F for ; Tue, 21 Oct 2014 11:18:51 +0000 (UTC) Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 3B645BCC; Tue, 21 Oct 2014 11:02:12 +0000 (UTC) X-Original-To: ltsi-dev@lists.linuxfoundation.org Delivered-To: ltsi-dev@mail.linuxfoundation.org Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 3DF0CD74 for ; Tue, 21 Oct 2014 11:02:11 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id 3AB9A1FAB2 for ; Tue, 21 Oct 2014 11:02:10 +0000 (UTC) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 21 Oct 2014 04:02:10 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,761,1406617200"; d="scan'208";a="617793899" Received: from ubuntu-desktop.png.intel.com ([10.221.122.25]) by fmsmga002.fm.intel.com with ESMTP; 21 Oct 2014 04:02:09 -0700 From: Dheeraj Jamwal To: ltsi-dev@lists.linuxfoundation.org Date: Tue, 21 Oct 2014 18:47:28 +0800 Message-Id: <1413889294-31328-249-git-send-email-dheerajx.s.jamwal@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1413889294-31328-1-git-send-email-dheerajx.s.jamwal@intel.com> References: <1413889294-31328-1-git-send-email-dheerajx.s.jamwal@intel.com> MIME-Version: 1.0 X-Spam-Status: No, score=-5.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org Subject: [LTSI-dev] [PATCH 0248/1094] drm/i915/bdw: Free PPGTT struct X-BeenThere: ltsi-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "A list to discuss patches, development, and other things related to the LTSI project" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: ltsi-dev-bounces@lists.linuxfoundation.org Errors-To: ltsi-dev-bounces@lists.linuxfoundation.org X-Virus-Scanned: ClamAV using ClamSMTP From: Ben Widawsky GEN8 never freed the PPGTT struct. As GEN8 doesn't use full PPGTT, the leak is small and only found on a module reload. ie. I don't think this needs to go to stable. v2: The very naive, kfree in gen8 ppgtt cleanup, is subject to a double free on PPGTT initialization failure. (Spotted by Imre). Instead this patch pulls the ppgtt struct freeing out of the cleanup and leaves it to the allocators/callers or the one doing the last kref_put as in standard convention Reported-by: Ville Syrjälä Signed-off-by: Ben Widawsky Reviewed-by: Imre Deak Signed-off-by: Daniel Vetter (cherry picked from commit b18b6bde300e1abe30e8b27501411a4b4a95ffeb) Signed-off-by: Dheeraj Jamwal --- drivers/gpu/drm/i915/i915_gem_context.c | 12 ++++++++++-- drivers/gpu/drm/i915/i915_gem_gtt.c | 1 - 2 files changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index ed1ee0d..46b6d10 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -99,9 +99,8 @@ static int do_switch(struct intel_ring_buffer *ring, struct i915_hw_context *to); -static void ppgtt_release(struct kref *kref) +static void do_ppgtt_cleanup(struct i915_hw_ppgtt *ppgtt) { - struct i915_hw_ppgtt *ppgtt = container_of(kref, struct i915_hw_ppgtt, ref); struct drm_device *dev = ppgtt->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; struct i915_address_space *vm = &ppgtt->base; @@ -135,6 +134,15 @@ static void ppgtt_release(struct kref *kref) ppgtt->base.cleanup(&ppgtt->base); } +static void ppgtt_release(struct kref *kref) +{ + struct i915_hw_ppgtt *ppgtt = + container_of(kref, struct i915_hw_ppgtt, ref); + + do_ppgtt_cleanup(ppgtt); + kfree(ppgtt); +} + static size_t get_context_alignment(struct drm_device *dev) { if (IS_GEN6(dev)) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 1b9d3a2..8da049a 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -859,7 +859,6 @@ static void gen6_ppgtt_cleanup(struct i915_address_space *vm) for (i = 0; i < ppgtt->num_pd_entries; i++) __free_page(ppgtt->pt_pages[i]); kfree(ppgtt->pt_pages); - kfree(ppgtt); } static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)