drm/i915/gem: Drop local vma->vm_file reference

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We use the global device inode, shared amongst all files, and not the
user's device filp to provide the backing storage for the mmap. The
vma->vm_file provides a redundant reference that breaks existing
expected behaviour that closing the user's device fd will release the
resources bound to it, if a mmap persists. (Even without the
vma->vm_file, the mmap will persist past the user's fd as the storage is
bound to the device, i.e. our reference is on the object not file.)

Fixes: cc662126b4 ("drm/i915: Introduce DRM_I915_GEM_MMAP_OFFSET")
Closes: https://gitlab.freedesktop.org/drm/intel/issues/919
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200101141007.755429-1-chris@chris-wilson.co.uk

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Chris Wilson 2020-01-01 14:10:07 +00:00

parent 1cd21a7c56

commit f17b898009

2 changed files with 69 additions and 0 deletions

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59

drivers/gpu/drm/i915/gem/i915_gem_mman.c

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10

drivers/gpu/drm/i915/i915_drv.h

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