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| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2013-12-12 20:53:59 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-12-16 17:37:56 +0400 |
| commit | f7038b7c3f4924b18390c51c1ec1e49287cc87db (patch) | |
| tree | 1d2db04d9d8ed0497694dc1fee5ae95b4de8d946 /arch/s390/pci | |
| parent | 0c0c2776926018e7560b99e921467aea1115d03b (diff) | |
| download | linux-f7038b7c3f4924b18390c51c1ec1e49287cc87db.tar.xz | |
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')
| -rw-r--r-- | arch/s390/pci/pci_dma.c | 13 |
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)); } |