Re: [PATCH 1/4] mm: introduce vma_set_file function v2

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On 10/8/20 4:23 AM, Christian König wrote:
Add the new vma_set_file() function to allow changing
vma->vm_file with the necessary refcount dance.

v2: add more users of this.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
  drivers/dma-buf/dma-buf.c                  | 16 +++++-----------
  drivers/gpu/drm/etnaviv/etnaviv_gem.c      |  4 +---
  drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c |  3 +--
  drivers/gpu/drm/i915/gem/i915_gem_mman.c   |  4 ++--
  drivers/gpu/drm/msm/msm_gem.c              |  4 +---
  drivers/gpu/drm/omapdrm/omap_gem.c         |  3 +--
  drivers/gpu/drm/vgem/vgem_drv.c            |  3 +--
  drivers/staging/android/ashmem.c           |  5 ++---
  include/linux/mm.h                         |  2 ++
  mm/mmap.c                                  | 16 ++++++++++++++++
  10 files changed, 32 insertions(+), 28 deletions(-)

Looks like a nice cleanup. Two comments below.

...

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index 3d69e51f3e4d..c9d5f1a38af3 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -893,8 +893,8 @@ int i915_gem_mmap(struct file *filp, struct vm_area_struct *vma)
  	 * requires avoiding extraneous references to their filp, hence why
  	 * we prefer to use an anonymous file for their mmaps.
  	 */
-	fput(vma->vm_file);
-	vma->vm_file = anon;
+	vma_set_file(vma, anon);
+	fput(anon);

That's one fput() too many, isn't it?

...

diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
index 10b4be1f3e78..a51dc089896e 100644
--- a/drivers/staging/android/ashmem.c
+++ b/drivers/staging/android/ashmem.c
@@ -450,9 +450,8 @@ static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
  		vma_set_anonymous(vma);
  	}
- if (vma->vm_file)
-		fput(vma->vm_file);
-	vma->vm_file = asma->file;
+	vma_set_file(vma, asma->file);
+	fput(asma->file);

Same here: that fput() seems wrong, as it was already done within vma_set_file().


thanks,
--
John Hubbard
NVIDIA
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