Deepak Nibade 978d13efe5 gpu: nvgpu: hold mutex to get cde context only ...

In gk20a_cde_convert(), we hold cde_app.mutex almost
for everything which is unnecessary

Also, this causes a deadlock scenario when gk20a_do_idle()
is called
In some cases it is possible that Thread 1
holds the lock and is trying to power on GPU, and
Thread 2 is trying to power off GPU and then grab
cde_app.mutex to cleanup GPU state

To fix this, grab the mutex only for gk20a_cde_get_context()
and then release it

Bug 200287073

Change-Id: Ic4856604652d0d4024abdeb5c2f8f03910c601a5
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1324328
(cherry picked from commit 3c8eef0d0e)
Reviewed-on: http://git-master/r/1322030
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>

2017-03-23 07:13:50 -07:00

..

nvgpu

gpu: nvgpu: hold mutex to get cde context only

2017-03-23 07:13:50 -07:00