diff options
| -rw-r--r-- | Documentation/DMA-API.txt | 3 | ||||
| -rw-r--r-- | arch/x86/kernel/pci-dma_32.c | 3 | ||||
| -rw-r--r-- | arch/x86/kernel/pci-dma_64.c | 1 | ||||
| -rw-r--r-- | lib/swiotlb.c | 1 |
4 files changed, 7 insertions, 1 deletions
diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt index cc7a8c39fb6..b939ebb6287 100644 --- a/Documentation/DMA-API.txt +++ b/Documentation/DMA-API.txt @@ -68,6 +68,9 @@ size and dma_handle must all be the same as those passed into the consistent allocate. cpu_addr must be the virtual address returned by the consistent allocate. +Note that unlike their sibling allocation calls, these routines +may only be called with IRQs enabled. + Part Ib - Using small dma-coherent buffers ------------------------------------------ diff --git a/arch/x86/kernel/pci-dma_32.c b/arch/x86/kernel/pci-dma_32.c index 048f09b6255..0aae2f3847a 100644 --- a/arch/x86/kernel/pci-dma_32.c +++ b/arch/x86/kernel/pci-dma_32.c @@ -63,7 +63,8 @@ void dma_free_coherent(struct device *dev, size_t size, { struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL; int order = get_order(size); - + + WARN_ON(irqs_disabled()); /* for portability */ if (mem && vaddr >= mem->virt_base && vaddr < (mem->virt_base + (mem->size << PAGE_SHIFT))) { int page = (vaddr - mem->virt_base) >> PAGE_SHIFT; diff --git a/arch/x86/kernel/pci-dma_64.c b/arch/x86/kernel/pci-dma_64.c index 29711445c81..9576a2eb375 100644 --- a/arch/x86/kernel/pci-dma_64.c +++ b/arch/x86/kernel/pci-dma_64.c @@ -167,6 +167,7 @@ EXPORT_SYMBOL(dma_alloc_coherent); void dma_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t bus) { + WARN_ON(irqs_disabled()); /* for portability */ if (dma_ops->unmap_single) dma_ops->unmap_single(dev, bus, size, 0); free_pages((unsigned long)vaddr, get_order(size)); diff --git a/lib/swiotlb.c b/lib/swiotlb.c index a7381d55663..30c1400e749 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -497,6 +497,7 @@ void 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)); |