Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754296AbcDVLOm (ORCPT ); Fri, 22 Apr 2016 07:14:42 -0400 Received: from mx2.suse.de ([195.135.220.15]:44109 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753671AbcDVLG3 (ORCPT ); Fri, 22 Apr 2016 07:06:29 -0400 X-Amavis-Alert: BAD HEADER SECTION, Duplicate header field: "References" From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, =?UTF-8?q?Nicolai=20H=C3=A4hnle?= , Jiri Slaby Subject: [PATCH 3.12 54/78] drm/radeon: hold reference to fences in radeon_sa_bo_new (3.17 and older) Date: Fri, 22 Apr 2016 13:05:37 +0200 Message-Id: X-Mailer: git-send-email 2.8.1 In-Reply-To: References: In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1754 Lines: 49 From: Nicolai Hähnle 3.12-stable review patch. If anyone has any objections, please let me know. =============== [Backport of upstream commit f6ff4f67cdf8455d0a4226eeeaf5af17c37d05eb, with an additional NULL pointer guard that is required for kernels 3.17 and older. To be precise, any kernel that does *not* have commit 954605ca3 "drm/radeon: use common fence implementation for fences, v4" requires this additional NULL pointer guard.] An arbitrary amount of time can pass between spin_unlock and radeon_fence_wait_any, so we need to ensure that nobody frees the fences from under us. Based on the analogous fix for amdgpu. Signed-off-by: Nicolai Hähnle Reviewed-by: Christian König (v1 + fix) Tested-by: Lutz Euler Signed-off-by: Jiri Slaby --- drivers/gpu/drm/radeon/radeon_sa.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/radeon/radeon_sa.c b/drivers/gpu/drm/radeon/radeon_sa.c index f0bac68254b7..8962411b5f2b 100644 --- a/drivers/gpu/drm/radeon/radeon_sa.c +++ b/drivers/gpu/drm/radeon/radeon_sa.c @@ -349,8 +349,15 @@ int radeon_sa_bo_new(struct radeon_device *rdev, /* see if we can skip over some allocations */ } while (radeon_sa_bo_next_hole(sa_manager, fences, tries)); + for (i = 0; i < RADEON_NUM_RINGS; ++i) { + if (fences[i]) + radeon_fence_ref(fences[i]); + } + spin_unlock(&sa_manager->wq.lock); r = radeon_fence_wait_any(rdev, fences, false); + for (i = 0; i < RADEON_NUM_RINGS; ++i) + radeon_fence_unref(&fences[i]); spin_lock(&sa_manager->wq.lock); /* if we have nothing to wait for block */ if (r == -ENOENT && block) { -- 2.8.1