V4L/DVB (5917): ivtv: improve mailbox responsiveness.
First try polling for the result of a mailbox command, then switch to a test/sleep loop. Also reduce the sleep time from 10 ms to 1 ms. Improves the responsiveness of the mailbox handling. Signed-off-by: NHans Verkuil <hverkuil@xs4all.nl> Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>
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