linux-kernel - Re: [PATCH 1/6] tty: implement write

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Message-ID: <YAnAfNcE8Bw95+SV@kroah.com>
Date:   Thu, 21 Jan 2021 18:57:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Jiri Slaby <jirislaby@...nel.org>, linux-serial@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Oliver Giles <ohw.giles@...il.com>,
        Robert Karszniewicz <r.karszniewicz@...tec.de>
Subject: Re: [PATCH 1/6] tty: implement write_iter

On Thu, Jan 21, 2021 at 09:44:17AM -0800, Linus Torvalds wrote:
> On Thu, Jan 21, 2021 at 1:40 AM Jiri Slaby <jirislaby@...nel.org> wrote:
> >
> > Ok, here belongs my earlier note: "if ld == NULL => crash here." That is
> > if hangup happens during the ldisc wait, the kernel will crash in
> > tty_ldisc_deref.
> 
> Right you are, good catch.
> 
> > Is there a reason not to convert hung_up_tty_fops too and leave the
> > return hung_up_tty_write here intact? This would also solve the comments
> > above.
> 
> No, no reason. I started out just changing that one tty_write, then
> noticed that I had to change the redirect case too, but never then got
> to "yeah, I should have changed the hup case as well".
> 
> Greg, do you prefer a new series, or incremental patches?

Incremental patches please as these are already in my public branches
and I would have to revert them and add new ones but that's messy, so
fixes on top is fine.

thanks,

greg k-h