This is a note to let you know that I've just added the patch titled
sysrq: attach sysrq handler correctly for 32-bit kernel
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:
sysrq-attach-sysrq-handler-correctly-for-32-bit-kernel.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@xxxxxxxxxxxxxxx> know about it.
>From 802c03881f29844af0252b6e22be5d2f65f93fd0 Mon Sep 17 00:00:00 2001
From: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Date: Fri, 6 Jan 2017 02:14:16 +0900
Subject: sysrq: attach sysrq handler correctly for 32-bit kernel
From: Akinobu Mita <akinobu.mita@xxxxxxxxx>
commit 802c03881f29844af0252b6e22be5d2f65f93fd0 upstream.
The sysrq input handler should be attached to the input device which has
a left alt key.
On 32-bit kernels, some input devices which has a left alt key cannot
attach sysrq handler. Because the keybit bitmap in struct input_device_id
for sysrq is not correctly initialized. KEY_LEFTALT is 56 which is
greater than BITS_PER_LONG on 32-bit kernels.
I found this problem when using a matrix keypad device which defines
a KEY_LEFTALT (56) but doesn't have a KEY_O (24 == 56%32).
Cc: Jiri Slaby <jslaby@xxxxxxxx>
Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Acked-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/sysrq.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -946,8 +946,8 @@ static const struct input_device_id sysr
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_KEYBIT,
- .evbit = { BIT_MASK(EV_KEY) },
- .keybit = { BIT_MASK(KEY_LEFTALT) },
+ .evbit = { [BIT_WORD(EV_KEY)] = BIT_MASK(EV_KEY) },
+ .keybit = { [BIT_WORD(KEY_LEFTALT)] = BIT_MASK(KEY_LEFTALT) },
},
{ },
};
Patches currently in stable-queue which might be from akinobu.mita@xxxxxxxxx are
queue-4.9/sysrq-attach-sysrq-handler-correctly-for-32-bit-kernel.patch
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