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authorChristian König <christian.koenig@amd.com>2020-09-14 15:09:33 +0200
committerChristian König <christian.koenig@amd.com>2020-11-19 10:36:36 +0100
commit295992fb815e791d14b18ef7cdbbaf1a76211a31 (patch)
tree2b72922a11a0abd63cb11969d3fd5cd7d2874e1c /drivers/dma-buf
parent1527f926fd04490f648c42f42b45218a04754f87 (diff)
mm: introduce vma_set_file function v5
Add the new vma_set_file() function to allow changing vma->vm_file with the necessary refcount dance. v2: add more users of this. v3: add missing EXPORT_SYMBOL, rebase on mmap cleanup, add comments why we drop the reference on two occasions. v4: make it clear that changing an anonymous vma is illegal. v5: move vma_set_file to mm/util.c Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> (v2) Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Link: https://patchwork.freedesktop.org/patch/399360/
Diffstat (limited to 'drivers/dma-buf')
-rw-r--r--drivers/dma-buf/dma-buf.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 282bd8b84170..e63684d4cd90 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -1183,8 +1183,7 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
return -EINVAL;
/* readjust the vma */
- fput(vma->vm_file);
- vma->vm_file = get_file(dmabuf->file);
+ vma_set_file(vma, dmabuf->file);
vma->vm_pgoff = pgoff;
return dmabuf->ops->mmap(dmabuf, vma);