linux-kernel - [PATCH 3.12 33/86] char: lack of bool string made CONFIG

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Message-Id: <1b991103f0a363e22001fd479fa90d27cf6c9381.1493888632.git.jslaby@suse.cz>
Date:   Thu,  4 May 2017 11:03:58 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Max Bires <jbires@...gle.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 33/86] char: lack of bool string made CONFIG_DEVPORT always on

From: Max Bires <jbires@...gle.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit f2cfa58b136e4b06a9b9db7af5ef62fbb5992f62 upstream.

Without a bool string present, using "# CONFIG_DEVPORT is not set" in
defconfig files would not actually unset devport. This esnured that
/dev/port was always on, but there are reasons a user may wish to
disable it (smaller kernel, attack surface reduction) if it's not being
used. Adding a message here in order to make this user visible.

Signed-off-by: Max Bires <jbires@...gle.com>
Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/char/Kconfig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 0070872c1441..a961133e2aa2 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -567,9 +567,12 @@ config TELCLOCK
 	  controlling the behavior of this hardware.
 
 config DEVPORT
-	bool
+	bool "/dev/port character device"
 	depends on ISA || PCI
 	default y
+	help
+	  Say Y here if you want to support the /dev/port device. The /dev/port
+	  device is similar to /dev/mem, but for I/O ports.
 
 source "drivers/s390/char/Kconfig"
 
-- 
2.12.2