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
