linux-kernel - Re: [PATCH 2/3] vt: fix issue when fbcon wants to takeover a second time.

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Message-ID: <AANLkTinsVH2pyPfEjEfm9JD=D8P12Q0Y56y+ZJbpYc06@mail.gmail.com>
Date:	Fri, 7 Jan 2011 09:57:41 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	linux-kernel@...r.kernel.org, Dave Airlie <airlied@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, Greg KH <greg@...e.de>
Subject: Re: [PATCH 2/3] vt: fix issue when fbcon wants to takeover a second time.

Hi Greg,

here is the patch I think you missed.

Dave.

On Tue, Dec 21, 2010 at 11:41 AM, Dave Airlie <airlied@...il.com> wrote:
> From: Dave Airlie <airlied@...hat.com>
>
> With framebuffer handover and multiple GPUs, we get into a
> position where the fbcon unbinds the vesafb framebuffer for GPU 1,
> but we still have a radeon framebuffer bound from GPU 0, so
> we don't unregister the console driver. Then when we tried to bind
> the new radeon framebuffer for GPU1 we never get to the bind
> call as we fail due to the console being registered already.
>
> This changes the return value to -EBUSY when the driver is
> already registered and continues to bind for -EBUSY.
>
> Signed-off-by: Dave Airlie <airlied@...hat.com>
> Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
> Cc: Greg KH <greg@...e.de>
> ---
>  drivers/tty/vt/vt.c |    9 +++++++--
>  1 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
> index a8ec48e..d781496 100644
> --- a/drivers/tty/vt/vt.c
> +++ b/drivers/tty/vt/vt.c
> @@ -3524,7 +3524,7 @@ int register_con_driver(const struct consw *csw, int first, int last)
>
>                /* already registered */
>                if (con_driver->con == csw)
> -                       retval = -EINVAL;
> +                       retval = -EBUSY;
>        }
>
>        if (retval)
> @@ -3635,7 +3635,12 @@ int take_over_console(const struct consw *csw, int first, int last, int deflt)
>        int err;
>
>        err = register_con_driver(csw, first, last);
> -
> +       /* if we get an busy error we still want to bind the console driver
> +        * and return success, as we may have unbound the console driver
> +        * but not unregistered it.
> +        */
> +       if (err == -EBUSY)
> +               err = 0;
>        if (!err)
>                bind_con_driver(csw, first, last, deflt);
>
> --
> 1.7.1
>
> --
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