tree fe21fec54a4261c147ef51c61db29009b6b9afd0
parent 47e7aba999eeca7b2db97ca388bc9c42524eec8e
author Mark Yao <mark.yao@rock-chips.com> 1466992161 -0400
committer Mark Yao <mark.yao@rock-chips.com> 1467252181 -0400

drm_gralloc: fix random crash with wildpointer

two drm handle may use same bo, but there is no
reference protect. if one of the drm handle release
the bo, another handle's bo become a wildpointer,
any read/write on the wildpointer will cause system
unstable, crash.

Change-Id: Ieaca522e3372dba82c48961499b9b657ca33cd15
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>