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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>
This commit is contained in:
Sebastian Ott 2013-12-12 17:53:59 +01:00 committed by Martin Schwidefsky
parent 0c0c277692
commit f7038b7c3f
1 changed files with 8 additions and 5 deletions
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13
arch/s390/pci/pci_dma.c
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@ -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));
}