drm/radeon: Fix pci_map_page() error checking

0 is a valid DMA address from pci_map_page(), use pci_dma_mapping_error()
instead to check for errors

[airlied: fix warning + two other places with errors.]

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/drm/ati_pcigart.c b/drivers/gpu/drm/ati_pcigart.c
index 17be051b7aa3..1c3649242208 100644
--- a/drivers/gpu/drm/ati_pcigart.c
+++ b/drivers/gpu/drm/ati_pcigart.c
@@ -152,7 +152,7 @@ int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *ga
                 /* we need to support large memory configurations */
                 entry->busaddr[i] = pci_map_page(dev->pdev, entry->pagelist[i],
                                                  0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
-                if (entry->busaddr[i] == 0) {
+                if (pci_dma_mapping_error(dev->pdev, entry->busaddr[i])) {
                         DRM_ERROR("unable to map PCIGART pages!\n");
                         drm_ati_pcigart_cleanup(dev, gart_info);
                         address = NULL;