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d12146f9e4
1. thread 1 is here https://github.com/codesnake/linux-amlogic/blob/master/drivers/amlogic/display/ge2d/ge2d_wq.c#L147 2. thread 2 is here https://github.com/codesnake/linux-amlogic/blob/master/drivers/amlogic/display/ge2d/ge2d_wq.c#L855 3. thread 2 is running and enters the if condition because state is GE2D_STATE_RUNNING 4. thread 2 gets interrupted by thread 1 thread 1 jumps over the if and sets GE2D_STATE_IDLE and is done 5. back to thread 2 which now sets state GE2D_STATE_REMOVING_WQ and calls wait_for_completion 6. thread2 will never return because thread 1 is done already and won't signal the event destroy_ge2d_work_queue is called from https://github.com/codesnake/linux-amlogic/blob/master/drivers/amlogic/amports/amvideocap.c#L320 in my use case and will block there forever - and basically blocks down to the read in the userspace which tries to read the current captured frame