linux-kernel - Re: [PATCH 5.10 044/390] serial: 8250: Let drivers request full 16550A feature probing

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Message-ID: <Y1fhrrEz50XCmD79@kroah.com>
Date:   Tue, 25 Oct 2022 15:16:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Pavel Machek <pavel@....cz>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Anders Blomdell <anders.blomdell@...trol.lth.se>,
        "Maciej W. Rozycki" <macro@...am.me.uk>
Subject: Re: [PATCH 5.10 044/390] serial: 8250: Let drivers request full
 16550A feature probing

On Mon, Oct 24, 2022 at 07:27:10PM +0200, Pavel Machek wrote:
> Hi!
> 
> > From: Maciej W. Rozycki <macro@...am.me.uk>
> > 
> > commit 9906890c89e4dbd900ed87ad3040080339a7f411 upstream.
> > 
> > A SERIAL_8250_16550A_VARIANTS configuration option has been recently
> > defined that lets one request the 8250 driver not to probe for 16550A
> > device features so as to reduce the driver's device startup time in
> > virtual machines.
> > 
> > Some actual hardware devices require these features to have been fully
> > determined however for their driver to work correctly, so define a flag
> > to let drivers request full 16550A feature probing on a device-by-device
> > basis if required regardless of the SERIAL_8250_16550A_VARIANTS option
> > setting chosen.
> 
> As far as I can see, the UPF_FULL_PROBE is never set in 5.10.150 tree,
> so we should not need it there.

Ah, yes, it was tagged wrong.  I'll go drop this now, it's only needed
in 5.15.y

thanks,

greg k-h