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Currently the buffers are being filled until full, which works fine for the transport stream, but not when reading sections, those have to be returned to userspace immediately, otherwise dvbv5-scan will just wait forever. Add a 'flush' argument to dvb_vb2_fill_buffer to indicate whether the buffer must be flushed or wait until it is full. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>