From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman Subject: [PATCH 3.14 111/130] drm/radeon: use post-decrement in error handling To: Cc: Greg Kroah-Hartman , , =?utf-8?Q?Christian=20K=C3=B6nig?= , Rasmus Villemoes , Alex Deucher Message-Id: <20160301234503.723133704@linuxfoundation.org> In-Reply-To: <20160301234459.768886030@linuxfoundation.org> References: <20160301234459.768886030@linuxfoundation.org> Date: Tue, 01 Mar 2016 23:53:38 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Rasmus Villemoes commit bc3f5d8c4ca01555820617eb3b6c0857e4df710d upstream. 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. Reviewed-by: Christian König Signed-off-by: Rasmus Villemoes Signed-off-by: Alex Deucher Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/radeon/radeon_ttm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -623,7 +623,7 @@ static int radeon_ttm_tt_populate(struct 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;