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-rw-r--r--kernel/dma-coherent.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/kernel/dma-coherent.c b/kernel/dma-coherent.c
index f013a0c2e111..4bdcea822b45 100644
--- a/kernel/dma-coherent.c
+++ b/kernel/dma-coherent.c
@@ -116,11 +116,25 @@ int dma_alloc_from_coherent(struct device *dev, ssize_t size,
int page = bitmap_find_free_region(mem->bitmap, mem->size,
order);
if (page >= 0) {
+ /*
+ * Memory was found in the per-device arena.
+ */
*dma_handle = mem->device_base + (page << PAGE_SHIFT);
*ret = mem->virt_base + (page << PAGE_SHIFT);
memset(*ret, 0, size);
- } else if (mem->flags & DMA_MEMORY_EXCLUSIVE)
+ } else if (mem->flags & DMA_MEMORY_EXCLUSIVE) {
+ /*
+ * The per-device arena is exhausted and we are not
+ * permitted to fall back to generic memory.
+ */
*ret = NULL;
+ } else {
+ /*
+ * The per-device arena is exhausted and we are
+ * permitted to fall back to generic memory.
+ */
+ return 0;
+ }
}
return (mem != NULL);
}