[PATCH] drm/radeon: Fix pci_map_page() error checking

[PATCH] drm/radeon: Fix pci_map_page() error checking

[Benjamin Herrenschmidt]

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

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 drivers/gpu/drm/radeon/radeon_device.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 6c95dcf..83024e8 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, "Failed to DMA MAP the dummy page\n");
 		__free_page(rdev->dummy_page.page);
 		rdev->dummy_page.page = NULL;
 		return -ENOMEM;



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