i915_dma_map_single relies on dma_mapping_error, which returns positive
error codes. Found by static checker.
Introduced by commit 678d96fbb3b5995a2fdff2bca5e1ab4a40b7e968
("drm/i915: Track GEN6 page table usage").
v2: Return negative error code and rename commit title. (Dan)
Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
Signed-off-by: Michel Thierry <michel.thierry@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 645c363..6bb31c8 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -311,7 +311,10 @@ static inline int i915_dma_map_page_single(struct page *page,
struct device *device = &dev->pdev->dev;
*daddr = dma_map_page(device, page, 0, 4096, PCI_DMA_BIDIRECTIONAL);
- return dma_mapping_error(device, *daddr);
+ if (dma_mapping_error(device, *daddr))
+ return -ENOMEM;
+
+ return 0;
}
static void unmap_and_free_pt(struct i915_page_table_entry *pt,
--
2.1.1
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