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tty: disable unbind for old 74xx based serial/mpsc console port 

We recently got rid of some modular code in this driver and also
got rid of the unused ".remove" function at the same time.  Thierry
noted that it was however possible to force the remove through the
bind/unbind interface.

Since this is a console device used on 2005 vintage 74xx based
powerpc embedded targets, and is essentially always used in
conjunction with SERIAL_MPSC_CONSOLE=y -- there is no sane reason
anyone would ever want to unbind the builtin driver and lose the
console.  So we just explicitly block bind/unbind operations and
prevent root from shooting themselves in the foot.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-serial@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paul Gortmaker 2015-10-13 19:06:30 -04:00 committed by Greg Kroah-Hartman
parent 06e7bd1f9b
commit 6200cbaf62
1 changed files with 2 additions and 1 deletions
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3
drivers/tty/serial/mpsc.c
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@ -2109,7 +2109,8 @@ static int mpsc_drv_probe(struct platform_device *dev)
static struct platform_driver mpsc_driver = {
.probe = mpsc_drv_probe,
.driver = {
.name = MPSC_CTLR_NAME,
.name = MPSC_CTLR_NAME,
.suppress_bind_attrs = true,
},
};