linux-kernel - Re: [PATCH 0/3] USB-Serial serdev support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20250303112530.igosjo3s5uocndxj@pengutronix.de>
Date: Mon, 3 Mar 2025 12:25:30 +0100
From: Marco Felsch <m.felsch@...gutronix.de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Rob Herring <robh@...nel.org>, Jiri Slaby <jirislaby@...nel.org>,
	Johan Hovold <johan@...nel.org>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 0/3] USB-Serial serdev support

Hi,

On 24-10-28, Marco Felsch wrote:
> Hi Greg,
> 
> On 24-10-01, Greg Kroah-Hartman wrote:
> > On Tue, Oct 01, 2024 at 09:24:53AM +0200, Marco Felsch wrote:
> > > Hi,
> > > 
> > > gentle ping as this is series is two months old now.
> > 
> > And it was rejected as serdev does not support hotplug which of course,
> > usb-serial does.
> 
> I hoped to get some feedback on my answer [1]. Regarding hotplug
> support: serdev _requires_ some sort of firmware like OF (not sure if it
> does work with ACPI too). That said, if serdev finds no firmware a
> fallback is provided to the standard serial handling.
> 
> The firmware could either be added directly by the platform OF file or
> via OF-overlays. By making use of overlays we could gain some kind of
> hotplug: Once a usb devices was detected and the driver has an
> overlay, the overlay gets applied and the probe continues, like we do it
> for PCIe devices now [2]. For devices which don't have a registered
> overlay the standard usb-serial setup is done by exposing the serial
> interface to the userspace.

is this idea worth to give it a try for a v2 or do you have something
different in mind?

I'm happy for any input.

Regards,
  Marco

> > So until serdev is fixed up to handle that correctly, this is not going
> > anywhere, nor should you want it to as then you would be in charge of
> > code that does not work properly :)
> 
> Regards,
>   Marco
> 
> [1] https://lore.kernel.org/all/20240917044948.i2eog4ondf7vna7q@pengutronix.de/
> [2] https://lore.kernel.org/all/7512cbb7911b8395d926e9e9e390fbb55ce3aea9.camel@pengutronix.de/
> 
> > 
> > thanks,
> > 
> > greg k-h
> >