diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index a7381d5..30c1400 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -497,6 +497,7 @@
 swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
 		      dma_addr_t dma_handle)
 {
+	WARN_ON(irqs_disabled());
 	if (!(vaddr >= (void *)io_tlb_start
                     && vaddr < (void *)io_tlb_end))
 		free_pages((unsigned long) vaddr, get_order(size));