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

[Uwe Kleine-König]

On Fri, Oct 16, 2026 at 02:59:47PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
> 
> 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. The only bit that has to remain
> is the ioctl interface, to ensure the serial_struct field is always
> zero.
> 
> Link: https://mirrors.nycbug.org/pub/The_Unix_Archive/Unix_Usenet/comp.unix.sysv386/1990-December/007174.html
> Fixes: a300273c458c ("serial: 8250: hub6: Add cleanup code")
> Fixes: c526404a4a92 ("serial: 8250: Fix corner case for port matching")
> Fixes: 7ab80d1e7243 ("serial: 8250: fix compile error with hub6_match_port() when compiled as a module")
> Fixes: da7b5fd4e17f ("serial: 8250_hub6: add missing include for hub6_match_port()")
> Fixes: 3d406299d882 ("serial: 8250_hub6: add hub6_match_port()")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

Fine for me. I wonder about the amount of Fixes: lines, but don't care
enough to check.

Acked-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxx>

Best regards
Uwe

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