[linux-dvb] [PATCH] add device node locking possibility to dvbcore

Johannes Stezenbach js at linuxtv.org
Sun Aug 19 23:10:02 CEST 2007


On Sun, Aug 19, 2007, Oliver Endriss wrote:
> 
> Does anyone know, why dvb_shutdown_timeout was introduced initially?

That was a (IMHO stupid) hack by Holger with the purpose of speeding
up tuning with szap a little bit by avoiding the FE_INIT after
re-opening the frontend device. I.e. Holger's use-case was
to run szap, terminate if with ^C, re-run szap for different program.
FE_INIT reintializes all demod registers so can take noticable time
if the i2c bus speed is slow.
IMHO dvb_shutdown_timeout never had any practical relevance.

BTW, Holger's preferred app for watching video was
http://linuxtv.org/hg/dvb-apps/file/tip/test/video.c :-)


Johannes



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