[media] cec: limit the size of the transmit queue
The size of the transmit queue was unlimited, which meant that in non-blocking mode you could flood the CEC adapter with messages to be transmitted. Limit this to 18 messages. Also print the number of pending transmits and the timeout value in the status debugfs file. Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>
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