Krzysztof Matula wrote: > SkyStar2, kernel: 2.6.10-1.760_FC3 > > I'm waiting for the dvr fd with select, and then if FD_ISSET I issue a > read() call to it. Usually it works perfectly well, but sometimes, > especially when other thread is performing multiple repeated tunings on > the forntend the read() blocks infinitely until the process is killed... Open with O_NONBLOCK. > I've observed similar behaviour on previous Fedora kernels (starting > with the 2.4 ones). The difference is that it was necessary to > rmmod/modprobe the skystar modules then, and now usually helps when only > the process is restarted. > > Can I enable any debug messages to investigate the problem further? I > can reproduce it easily... It has been reported a few times that the skystar2 driver has a bug where it stops outputting data. I assume a race in irq/dma handling, but didn't have the time to investigate (I also don't have hardware). You could do 'cat /proc/interrupts' to see if there are still irqs when your read() hangs. Johannes
