On Wed, 17 Mar 2010 13:30:50 +0100 Simon Kagstrom <simon.kagstrom@xxxxxxxxxxxxxx> wrote: > Port 0x80 is not safe to use on all x86 boards (see > arch/x86/kernel/io_delay.c), so use native_io_delay instead. > > Signed-off-by: Simon Kagstrom <simon.kagstrom@xxxxxxxxxxxxxx> native_io_delay() won't work if the system is being run with no delays. The I/O cycle isn't for the delay but to force the bus signals. So in various modes (paravirt, udelay, no delay) the native_io_delay won't actually do what is required. I'm actually surprised you hit this path and if anything the right fix is to avoid hitting this kind of probing in the first place. -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
