Hi Jan, On 05/04/2015 12:01 PM, Jan Kiszka wrote: > When nr_uarts was set to 0 (via config or 8250_core.nr_uarts), we crash > early on x86 because serial8250_isa_init_ports dereferences base_ops > which remains NULL. In fact, there is nothing to do for that function if > there are no uarts.
Thanks for finding this. So nr_uarts == 0 effectively disables the 8250 driver. Is there any reason not to simply abort the driver init instead? Regards, Peter Hurley > Signed-off-by: Jan Kiszka <jan.kis...@siemens.com> > --- > drivers/tty/serial/8250/8250_core.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/tty/serial/8250/8250_core.c > b/drivers/tty/serial/8250/8250_core.c > index 4506e40..e1363a40 100644 > --- a/drivers/tty/serial/8250/8250_core.c > +++ b/drivers/tty/serial/8250/8250_core.c > @@ -3256,7 +3256,7 @@ static void __init serial8250_isa_init_ports(void) > static int first = 1; > int i, irqflag = 0; > > - if (!first) > + if (!first || nr_uarts == 0) > return; > first = 0; > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
