Ever since linux-3.1, my DVB tuners have been non-functional. This turns out to be due to a bug in with this chunk of code inside linux/drivers/media/video/videobuf-dvb.c: /* register network adapter */ dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx); if (dvb->net.dvbdev == NULL) { result = -ENOMEM; goto fail_fe_conn; } The problem is, dvb_net_init() doesn't do anything for the case where CONFIG_DVB_NET is not set. And the code in videobuf-dvb.c treats this as a fatal error. The patch below (linux-3.2.6) fixes the regression. Signed-off-by: Mark Lord <mlord@xxxxxxxxx> --- Patch is also attached to bypass email mangling. --- linux-3.2.6/drivers/media/video/videobuf-dvb.c 2012-02-13 14:17:29.000000000 -0500 +++ linux/drivers/media/video/videobuf-dvb.c 2012-02-18 13:21:42.422716047 -0500 @@ -226,9 +226,10 @@ } /* register network adapter */ - dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx); - if (dvb->net.dvbdev == NULL) { - result = -ENOMEM; + result = dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx); + if (result < 0) { + printk(KERN_WARNING "%s: dvb_net_init failed (errno = %d)\n", + dvb->name, result); goto fail_fe_conn; } return 0;
--- linux-3.2.6/drivers/media/video/videobuf-dvb.c 2012-02-13 14:17:29.000000000 -0500 +++ linux/drivers/media/video/videobuf-dvb.c 2012-02-18 13:21:42.422716047 -0500 @@ -226,9 +226,10 @@ } /* register network adapter */ - dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx); - if (dvb->net.dvbdev == NULL) { - result = -ENOMEM; + result = dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx); + if (result < 0) { + printk(KERN_WARNING "%s: dvb_net_init failed (errno = %d)\n", + dvb->name, result); goto fail_fe_conn; } return 0;