staging: sync: Fix race condition between merge and signal
authorØrjan Eide <orjan.eide@arm.com>
Fri, 1 Mar 2013 00:43:24 +0000 (16:43 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 4 Mar 2013 09:46:55 +0000 (17:46 +0800)
commit713648f0f137e149a1acade3278b621728291f37
tree632711740659a87671464a330c06c87eeefeb947
parentb699a644f82110e8e5a0f9b45ee1d3a3cd3e4586
staging: sync: Fix race condition between merge and signal

The copied sync_pt was activated immediately. If the sync_pt was
signaled before the entire merge was completed, the new fence's pt_list
could be iterated over while it is still in the process of being
created.

Moving the the sync_pt_activate call for all new sync_pts to after both
the sync_fence_copy_pts and the sync_fence_merge_pts calls ensure that
the pt_list is complete and immutable before it can be reached from the
timeline's active list.

Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Erik Gilling <konkers@android.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Clark <robclark@gmail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: dri-devel@lists.freedesktop.org
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: Erik Gilling <konkers@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/staging/android/sync.c