From: Akinobu Mita Date: Thu, 5 Jan 2017 17:14:16 +0000 (+0900) Subject: sysrq: attach sysrq handler correctly for 32-bit kernel X-Git-Tag: firefly_0821_release~176^2~4^2~3^2~20 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ca81117b7432da2d154cb65411d115d445c787de;p=firefly-linux-kernel-4.4.55.git sysrq: attach sysrq handler correctly for 32-bit kernel 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 Signed-off-by: Akinobu Mita Acked-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c index 5381a728d23e..1fa4128eb88e 100644 --- a/drivers/tty/sysrq.c +++ b/drivers/tty/sysrq.c @@ -939,8 +939,8 @@ 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) }, }, { }, };