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
