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drm/i915/gvt: use pfn_valid for better checking 

Before get the page from pfn, use pfn_valid to check if pfn
is able to translate to page structure.

Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Chuanxiao Dong 2017-03-01 14:34:52 +08:00 committed by Zhenyu Wang
parent 858b0f571d
commit b6b6fbc831
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/gvt/kvmgt.c
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@ -96,10 +96,10 @@ static int gvt_dma_map_iova(struct intel_vgpu *vgpu, kvm_pfn_t pfn,
struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;
dma_addr_t daddr;
page = pfn_to_page(pfn);
if (is_error_page(page))
if (unlikely(!pfn_valid(pfn)))
return -EFAULT;
page = pfn_to_page(pfn);
daddr = dma_map_page(dev, page, 0, PAGE_SIZE,
PCI_DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, daddr))