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>

3 files changed, 4 insertions, 3 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;
diff --git a/drivers/gpu/drm/radeon/r600_cp.c b/drivers/gpu/drm/radeon/r600_cp.c
index 68e6f4349309..4f4cd8b286d5 100644
--- a/drivers/gpu/drm/radeon/r600_cp.c
+++ b/drivers/gpu/drm/radeon/r600_cp.c
@@ -200,7 +200,7 @@ int r600_page_table_init(struct drm_device *dev)
                                                  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");
                         r600_page_table_cleanup(dev, gart_info);
                         goto done;
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index a64811a94519..4f7a170d1566 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -347,7 +347,8 @@ int radeon_dummy_page_init(struct radeon_device *rdev)
                 return -ENOMEM;
         rdev->dummy_page.addr = pci_map_page(rdev->pdev, rdev->dummy_page.page,
                                         0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
-        if (!rdev->dummy_page.addr) {
+        if (pci_dma_mapping_error(rdev->pdev, rdev->dummy_page.addr)) {
+                dev_err(&rdev->pdev->dev, "Failed to DMA MAP the dummy page\n");
                 __free_page(rdev->dummy_page.page);
                 rdev->dummy_page.page = NULL;
                 return -ENOMEM;