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drm/amdgpu: use post-decrement in error handling

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commit 09ccbb74b6718ad4d1290de3f5669212c0ac7d4b 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>
This commit is contained in:
Rasmus Villemoes 2016-02-15 19:41:45 +01:00 committed by Greg Kroah-Hartman
parent 4d6bc4fa32
commit 8fb49d08fa
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
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@ -712,7 +712,7 @@ static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm)
0, PAGE_SIZE,
PCI_DMA_BIDIRECTIONAL);
if (pci_dma_mapping_error(adev->pdev, gtt->ttm.dma_address[i])) {
while (--i) {
while (i--) {
pci_unmap_page(adev->pdev, gtt->ttm.dma_address[i],
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
gtt->ttm.dma_address[i] = 0;