Re: [PATCH] sysrq: attach sysrq handler correctly for 32-bit kernel
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: 2017-01-05 22:16:20
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On Fri, Jan 06, 2017 at 02:14:16AM +0900, Akinobu Mita wrote:
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <redacted> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> I guess Greg will take it through TTY tree. Might go to stable as well, although apparently not pressing since it was only noticed now.
quoted hunk ↗ jump to hunk
--- drivers/tty/sysrq.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c index 52bbd27..701c085 100644 --- 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) }, }, { }, };-- 2.7.4
Thanks. -- Dmitry