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We are doing ->buf_prepare(buf) before adding buf to q->stream list. This means that videobuf_qbuf() should not try to re-add a STATE_PREPARED buffer. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>