sysrq: attach sysrq handler correctly for 32-bit kernel

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@suse.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index 52bbd27e93ae7a83af92489b6d27fe0309437afe..701c085bb19b8e03f67316133fa5a4be7e0b05fe 100644 (file)
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -946,8 +946,8 @@ static const struct input_device_id sysrq_ids[] = {
        {
                .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) },
        },
        { },
 };