[PATCH 1/2] tty: serial: remove hub6 multiport support

[Andy Shevchenko]

On Fri, Oct 16, 2026 at 02:59:47PM +0200, Arnd Bergmann wrote:
> 
> hub6 support was added in linux-0.99 and the hardware was already old at
> the time, being discontinued in 1990. The code for it has always been a
> mess since it adds another dimension to the I/O addressing in the driver
> that has leaked into many individual files.
> 
> Hugo and Uwe have attempted several times this year alone to isolate
> the hub6 handling into the 8250_hub6.c file, but I feel that none of
> this has been a real improvement over the original standalone loadable
> module support.
> 
> Any machine that would have used this ISA card in practice is likely
> 30 to 40 years old, and with i486 support now removed, it is clearly
> safe to just kill this all off.

Please!

> The only bit that has to remain
> is the ioctl interface, to ensure the serial_struct field is always
> zero.

Reviewed-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
But there are some minor issues to fix, see below.

...

>  {
>  	unsigned long old_iobase, old_mapbase;
> -	unsigned int old_type, old_iotype, old_hub6, old_shift;
> +	unsigned int old_type, old_iotype, old_shift;

Move it line up, so we will have reversed xmas tree order.

>  	int retval;

...

> +	/* hub6 is no longer support */
> +        if (new_info->hub6 != 0)
> +                return -EINVAL;

Please, fix the indentation, should use tabs.

-- 
With Best Regards,
Andy Shevchenko