summaryrefslogtreecommitdiffstats
path: root/arch/s390/pci/pci_dma.c
diff options
context:
space:
mode:
authorSebastian Ott <sebott@linux.vnet.ibm.com>2013-12-12 17:53:59 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-12-16 14:37:56 +0100
commitf7038b7c3f4924b18390c51c1ec1e49287cc87db (patch)
tree1d2db04d9d8ed0497694dc1fee5ae95b4de8d946 /arch/s390/pci/pci_dma.c
parents390/pci: set error state for unavailable functions (diff)
downloadlinux-f7038b7c3f4924b18390c51c1ec1e49287cc87db.tar.xz
linux-f7038b7c3f4924b18390c51c1ec1e49287cc87db.zip
s390/pci/dma: fix accounting of allocated_pages
allocated_pages sometimes are increased even if s390_dma_alloc fails also this value is never decreased even if s390_dma_free is called. This patch fixes these bugs. Also remove the atomic64_t casts (the members are already of this type). Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/pci/pci_dma.c')
-rw-r--r--arch/s390/pci/pci_dma.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index 9b83d080902d..60c11a629d96 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -285,7 +285,7 @@ static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
flags |= ZPCI_TABLE_PROTECTED;
if (!dma_update_trans(zdev, pa, dma_addr, size, flags)) {
- atomic64_add(nr_pages, (atomic64_t *) &zdev->fmb->mapped_pages);
+ atomic64_add(nr_pages, &zdev->fmb->mapped_pages);
return dma_addr + (offset & ~PAGE_MASK);
}
@@ -313,7 +313,7 @@ static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr,
zpci_err_hex(&dma_addr, sizeof(dma_addr));
}
- atomic64_add(npages, (atomic64_t *) &zdev->fmb->unmapped_pages);
+ atomic64_add(npages, &zdev->fmb->unmapped_pages);
iommu_page_index = (dma_addr - zdev->start_dma) >> PAGE_SHIFT;
dma_free_iommu(zdev, iommu_page_index, npages);
}
@@ -332,7 +332,6 @@ static void *s390_dma_alloc(struct device *dev, size_t size,
if (!page)
return NULL;
- atomic64_add(size / PAGE_SIZE, (atomic64_t *) &zdev->fmb->allocated_pages);
pa = page_to_phys(page);
memset((void *) pa, 0, size);
@@ -343,6 +342,7 @@ static void *s390_dma_alloc(struct device *dev, size_t size,
return NULL;
}
+ atomic64_add(size / PAGE_SIZE, &zdev->fmb->allocated_pages);
if (dma_handle)
*dma_handle = map;
return (void *) pa;
@@ -352,8 +352,11 @@ static void s390_dma_free(struct device *dev, size_t size,
void *pa, dma_addr_t dma_handle,
struct dma_attrs *attrs)
{
- s390_dma_unmap_pages(dev, dma_handle, PAGE_ALIGN(size),
- DMA_BIDIRECTIONAL, NULL);
+ struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
+
+ size = PAGE_ALIGN(size);
+ atomic64_sub(size / PAGE_SIZE, &zdev->fmb->allocated_pages);
+ s390_dma_unmap_pages(dev, dma_handle, size, DMA_BIDIRECTIONAL, NULL);
free_pages((unsigned long) pa, get_order(size));
}