linux-kernel - Re: [5.11 regression] "tty: implement write

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Message-ID: <CAHk-=wjXRFCTp5TVOa1WnXNwMDRv+tzKuBM44NLRs+_0UvUVYw@mail.gmail.com>
Date:   Fri, 29 Jan 2021 12:28:20 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Hans de Goede <hdegoede@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Jiufei Xue <jiufei.xue@...ux.alibaba.com>,
        Miklos Szeredi <mszeredi@...hat.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [5.11 regression] "tty: implement write_iter" breaks TIOCCONS

On Fri, Jan 29, 2021 at 12:02 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> It's fairly easy to work around in this in the tty layer by just
> avoiding that function entirely, so I'll cook up a patch to do that.
> But I'm adding the appropriate people to the participants here because
> this really is very subtle if you ever hit it.

Here's the patch to make the tty layer just do the redirection
entirely internally, avoiding that mis-designed vfs_iocb_iter_write()
function.

Hans, does this fix things for you? I'm pretty confident it will, but
always best to double-check..

                 Linus

Download attachment "patch" of type "application/octet-stream" (1809 bytes)