From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753135AbcBOSmU (ORCPT ); Mon, 15 Feb 2016 13:42:20 -0500 Received: from mail-wm0-f54.google.com ([74.125.82.54]:36412 "EHLO mail-wm0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752756AbcBOSmS (ORCPT ); Mon, 15 Feb 2016 13:42:18 -0500 From: Rasmus Villemoes To: Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , David Airlie Cc: Rasmus Villemoes , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] drm/radeon: use post-decrement in error handling Date: Mon, 15 Feb 2016 19:41:47 +0100 Message-Id: <1455561708-32390-4-git-send-email-linux@rasmusvillemoes.dk> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1455561708-32390-1-git-send-email-linux@rasmusvillemoes.dk> References: <1455561708-32390-1-git-send-email-linux@rasmusvillemoes.dk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We need to use post-decrement to get the pci_map_page undone also for i==0, and to avoid some very unpleasant behaviour if pci_map_page failed already at i==0. Signed-off-by: Rasmus Villemoes --- drivers/gpu/drm/radeon/radeon_ttm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c index e34307459e50..e06ac546a90f 100644 --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -758,7 +758,7 @@ static int radeon_ttm_tt_populate(struct ttm_tt *ttm) 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); if (pci_dma_mapping_error(rdev->pdev, gtt->ttm.dma_address[i])) { - while (--i) { + while (i--) { pci_unmap_page(rdev->pdev, gtt->ttm.dma_address[i], PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); gtt->ttm.dma_address[i] = 0; -- 2.1.4