drm/rockchip: use drm_gem_mmap helpers

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Rather than (incompletely [0]) re-implementing drm_gem_mmap() and
drm_gem_mmap_obj() helpers, call them directly from the rockchip mmap
routines.

Once the core functions return successfully, the rockchip mmap routines
can still use dma_mmap_attrs() to simply mmap the entire buffer.

[0] Previously, we were performing the mmap() without first taking a
reference on the underlying gem buffer.  This could leak ptes if the gem
object is destroyed while userspace is still holding the mapping.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

...

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Daniel Kurtz 2015-07-07 17:03:36 +08:00 • committed by Daniel Vetter

parent e24ff467e1

commit 41315b793e

1 changed files with 34 additions and 33 deletions

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drivers/gpu/drm/rockchip/rockchip_drm_gem.c

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