On Fri, 23 Oct 2009, [UTF-8] Ozan Ã?aÄ?layan wrote: > > There's something odd about this. I'd like to see this file again, > > after the patch below has been applied. > > > > periodic > size = 1024 > 1: qh1024-0001/f6ffe280 (h2 ep2 [1/0] q0 p8) t00000000 On closer study and more careful thought, there's nothing odd here at all. This is what would be expected given the bug that you saw. > After putting a udelay() the problem seems to be resolved. I did a > rmmod-modprobe-sleep in 50 iterations, and the host controller was > still functional along with the web-cam: Okay, that proves this really is a timing bug in the hardware. But we can't go around putting 2-millisecond delays in the kernel! Maybe you can test to see if smaller delays will fix the problem. If 50 microseconds or less doesn't work then it will be necessary to add a new timer to ehci-hcd. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
