| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.14 111/130] drm/radeon: use post-decrement in error handling | Date | Tue, 01 Mar 2016 23:53:38 +0000 |
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3.14-stable review patch. If anyone has any objections, please let me know.
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From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
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 <christian.koenig@amd.com> Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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;
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