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UPSTREAM: char: lack of bool string made CONFIG_DEVPORT always on

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(cherry pick from commit f2cfa58b136e4b06a9b9db7af5ef62fbb5992f62)

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@google.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Bug: 37210310
Bug: 36604779
Change-Id: Ib1e947526f6c6f7cdf6389923287631056f32c36
This commit is contained in:
Max Bires 2017-01-03 08:18:07 -08:00 • committed by Mark Salyzyn
parent 738e1a1a46
commit c0fb2f9e58
1 changed files with 4 additions and 1 deletions
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5
drivers/char/Kconfig
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@ -583,9 +583,12 @@ 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"