V4L/DVB (7688): pvrusb2: Clean up dvb streaming start/stop
Eliminate the need for a separate pvr2_dvb_fh; since in the DVB context there can only ever be a single instance then there is no need for a separate instance to handle streaming state. This simplifies the module. Also move streaming start/stop out of the feed thread and into the driver's main context - which makes it possible for streaming start up failures to be detected by the DVB core. Signed-off-by: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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