On Sunday 19 March 2006 19:42, Mark Watson wrote: > First a bit of background. About a year and a half ago I built myself a PVR > using a Cypress FX2 to feed an mpeg TS from a digibox. This has been > working great except the FX2 disconnects every few weeks (possibly heat > related, I've just fitted a heatsink...). I'm finally trying to get to the > bottom of why it crashes when it disconnects, with the help of kgdb. I can > generally reproduce this crash by unplugging with vdr is running. > > My driver source is available at: > http://www.scrameta.net/skympeg/dvb_skympeg.c (Feeds a whole transponder > from an already configured FX2, filters a bit and pumps it into the kernel > dvb demux) > http://www.scrameta.net/skympeg/dvb_skympeg_fe.c (Just a stub for fake > tuning to allow vdr to work) > > In dvb_skympeg.c my cleanup code, called on usb disconnect, does something > like: > dev->dvb_demux.dmx.close(&dev->dvb_demux.dmx); > dev->dvb_demux.dmx.remove_frontend(&dev->dvb_demux.dmx, > &dev->fe_hw); dev->dvb_demux.dmx.remove_frontend(&dev->dvb_demux.dmx, > &dev->fe_mem); err("dvb_demux..."); > > dvb_dmxdev_release(&dev->dmxdev); > dvb_dmx_release(&dev->dvb_demux); > err("dvb_dmx_release"); > > if (dev->dvb_frontend) dvb_unregister_frontend(dev->dvb_frontend); > dev->dvb_frontend = 0; > err("dvb_unregister_frontend"); > > dvb_unregister_adapter(&dev->adapter); > err("dvb_unregister_adapter"); > > The problem occurs after it has logged "dvb_dmx_release". The crash is in > dmxdev.c:983 (in 2.6.15.6 official) in dvb_demux_poll, as called by vdr. > Now I can see why dmxdevfilter is invalid, since its been freed, but I'm > not sure how to avoid this since I already called dvb_dmxdev_release. Do I > need to check no-one is using the device before calling dvb_dmxdev_release? > I do have an open count on my device (though I think thats for USB?), but > no-one has it open. Sorry, not got much experience with device drivers on > linux... > > Hope someone can help. > > Thanks, > > Mark > > _______________________________________________ > > linux-dvb@xxxxxxxxxxx > http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb Please help! Do I need to provide more information? I only really want to know how I should be using the dvb_dmx_release. Presumably I need to check it is not being used before calling, but can't work out what. Thanks, Mark _______________________________________________ linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
