linux-kernel - Re: [GIT PULL] TTY/Serial driver fixes for 5.5-rc3

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Date:   Mon, 23 Dec 2019 07:06:51 -0500
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Jiri Slaby <jslaby@...e.cz>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-serial@...r.kernel.org
Subject: Re: [GIT PULL] TTY/Serial driver fixes for 5.5-rc3

On Fri, Dec 20, 2019 at 10:08:03AM -0800, Linus Torvalds wrote:
> On Thu, Dec 19, 2019 at 11:07 PM Greg KH <gregkh@...uxfoundation.org> wrote:
> >
> > The last tty core fix should resolve a long-standing bug with a race
> > at port creation time that some people would see, and Sudip finally
> > tracked down.
> 
> Hmm, looks good. But it makes me wonder if we should now try to remove
> the second call to tty_port_link_device()?
> 
> Now we have a number of helpers that do that tty_port_link_device()
> call for the driver (eg tty_port_register_device_attr_serdev(),
> tty_port_register_device_attr(), and the just added
> uart_add_one_port()).
> 
> But we also have drivers doing it by hand, and presumably we now have
> drivers that do it through multiple paths? I guess it's harmless, but
> it feels a bit odd. No?

It does.  I'll try to look at this after the holidays unless Sudip beats
me to it.

thanks,

greg k-h