Hi Stanimir, On Fri, Jun 12, 2020 at 5:20 PM Stanimir Varbanov <stanimir.varbanov@xxxxxxxxxx> wrote: > > I failed to found previous discussion on the subject, maybe it was on IRC. > > I stuck with fixing of issues which depends on this reqbuf(count=0). > Currently I'm counting the buffers in vb2::buf_init and vb2::buf_cleanup > but I don't want to rely on that implicit way anymore. > > If someone of you can remember let me know so that I can prepare an RFC. > > I can think of two options: > - change vb2::queue_setup so it could be called with num_buffers=0 > - add new vb2::queue_release op > > More options? Just to make sure we're on the same page: Are you looking for a way to handle some operation only when all buffers on the queue are being freed? Best regards, Tomasz