Patch "Revert "tty: serial: 8250: add CON_CONSDEV to flags"" has been added to the 4.9-stable tree

Patch "Revert "tty: serial: 8250: add CON_CONSDEV to flags"" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    Revert "tty: serial: 8250: add CON_CONSDEV to flags"

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     revert-tty-serial-8250-add-con_consdev-to-flags.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 6741f551a0b26479de2532ffa43a366747e6dbf3 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Sun, 11 Dec 2016 10:05:49 +0800
Subject: Revert "tty: serial: 8250: add CON_CONSDEV to flags"

From: Herbert Xu <herbert@gondor.apana.org.au>

commit 6741f551a0b26479de2532ffa43a366747e6dbf3 upstream.

This commit needs to be reverted because it prevents people from
using the serial console as a secondary console with input being
directed to tty0.

IOW, if you boot with console=ttyS0 console=tty0 then all kernels
prior to this commit will produce output on both ttyS0 and tty0
but input will only be taken from tty0.  With this patch the serial
console will always be the primary console instead of tty0,
potentially preventing people from getting into their machines in
emergency situations.

Fixes: d03516df8375 ("tty: serial: 8250: add CON_CONSDEV to flags")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/tty/serial/8250/8250_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -675,7 +675,7 @@ static struct console univ8250_console =
 	.device		= uart_console_device,
 	.setup		= univ8250_console_setup,
 	.match		= univ8250_console_match,
-	.flags		= CON_PRINTBUFFER | CON_ANYTIME | CON_CONSDEV,
+	.flags		= CON_PRINTBUFFER | CON_ANYTIME,
 	.index		= -1,
 	.data		= &serial8250_reg,
 };


Patches currently in stable-queue which might be from herbert@gondor.apana.org.au are

queue-4.9/revert-tty-serial-8250-add-con_consdev-to-flags.patch