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Add submit mutex lock to avoid race conditions between submitting a job, removing a job and submitting WFI With this lock make below operations atomic : during submit_gpfifo() - 1. getting new syncpt 2. inserting syncpt increment 3. submitting gpfifo 4. setting job completion interrupt during submit_wfi() - 1. getting new syncpt 2. inserting syncpt increment when idle during channel_update() - 1. checking the submit job completion 2. freeing the job if it is completed Bug 1305024 Change-Id: I0e3c0b8906d83fd59642344626ffdf24fad2aaab Signed-off-by: Deepak Nibade <dnibade@nvidia.com> Reviewed-on: http://git-master/r/397670 Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>