Merge tag 'dma-mapping-5.15' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping updates from Christoph Hellwig:

 - fix debugfs initialization order (Anthony Iliopoulos)

 - use memory_intersects() directly (Kefeng Wang)

 - allow to return specific errors from ->map_sg (Logan Gunthorpe,
   Martin Oliveira)

 - turn the dma_map_sg return value into an unsigned int (me)

 - provide a common global coherent pool іmplementation (me)

* tag 'dma-mapping-5.15' of git://git.infradead.org/users/hch/dma-mapping: (31 commits)
  hexagon: use the generic global coherent pool
  dma-mapping: make the global coherent pool conditional
  dma-mapping: add a dma_init_global_coherent helper
  dma-mapping: simplify dma_init_coherent_memory
  dma-mapping: allow using the global coherent pool for !ARM
  ARM/nommu: use the generic dma-direct code for non-coherent devices
  dma-direct: add support for dma_coherent_default_memory
  dma-mapping: return an unsigned int from dma_map_sg{,_attrs}
  dma-mapping: disallow .map_sg operations from returning zero on error
  dma-mapping: return error code from dma_dummy_map_sg()
  x86/amd_gart: don't set failed sg dma_address to DMA_MAPPING_ERROR
  x86/amd_gart: return error code from gart_map_sg()
  xen: swiotlb: return error code from xen_swiotlb_map_sg()
  parisc: return error code from .map_sg() ops
  sparc/iommu: don't set failed sg dma_address to DMA_MAPPING_ERROR
  sparc/iommu: return error codes from .map_sg() ops
  s390/pci: don't set failed sg dma_address to DMA_MAPPING_ERROR
  s390/pci: return error code from s390_dma_map_sg()
  powerpc/iommu: don't set failed sg dma_address to DMA_MAPPING_ERROR
  powerpc/iommu: return error code from .map_sg() ops
  ...

1 files changed, 7 insertions, 6 deletions

diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index 58f2f7abea96..93223bd110c3 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -487,18 +487,18 @@ static int s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
 	unsigned int max = dma_get_max_seg_size(dev);
 	unsigned int size = s->offset + s->length;
 	unsigned int offset = s->offset;
-	int count = 0, i;
+	int count = 0, i, ret;
 
 	for (i = 1; i < nr_elements; i++) {
 		s = sg_next(s);
 
-		s->dma_address = DMA_MAPPING_ERROR;
 		s->dma_length = 0;
 
 		if (s->offset || (size & ~PAGE_MASK) ||
 		    size + s->length > max) {
-			if (__s390_dma_map_sg(dev, start, size,
-					      &dma->dma_address, dir))
+			ret = __s390_dma_map_sg(dev, start, size,
+						&dma->dma_address, dir);
+			if (ret)
 				goto unmap;
 
 			dma->dma_address += offset;
@@ -511,7 +511,8 @@ static int s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
 		}
 		size += s->length;
 	}
-	if (__s390_dma_map_sg(dev, start, size, &dma->dma_address, dir))
+	ret = __s390_dma_map_sg(dev, start, size, &dma->dma_address, dir);
+	if (ret)
 		goto unmap;
 
 	dma->dma_address += offset;
@@ -523,7 +524,7 @@ unmap:
 		s390_dma_unmap_pages(dev, sg_dma_address(s), sg_dma_len(s),
 				     dir, attrs);
 
-	return 0;
+	return ret;
 }
 
 static void s390_dma_unmap_sg(struct device *dev, struct scatterlist *sg,