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sysrq: attach sysrq handler correctly for 32-bit kernel

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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 <[email protected]>
Signed-off-by: Akinobu Mita <[email protected]>
Acked-by: Dmitry Torokhov <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Akinobu Mita 2017-01-06 02:14:16 +09:00 • committed by Greg Kroah-Hartman
commit 802c03881f
1 changed files with 2 additions and 2 deletions
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4
drivers/tty/sysrq.c
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@ -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) },
},
{ },
};