From 3d289517dfd48f6487efda81543c3dda8b0e66f2 Mon Sep 17 00:00:00 2001 From: "Mathieu J. Poirier" Date: Wed, 5 Jun 2013 22:51:46 -0700 Subject: [PATCH] Input: sysrq - request graceful shutdown for key reset Attempt to reboot the system gracefully when a key combo is detected. If the reste combination is pressed the 2nd time we assume that graceful reboot failed and perform emergency reboot. This fucntionality is useful when UI is stuck but the system is otherwise working fine. Signed-off-by: Mathieu Poirier Signed-off-by: Dmitry Torokhov --- drivers/tty/sysrq.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c index b6b267d939a0..80310f7f58d3 100644 --- a/drivers/tty/sysrq.c +++ b/drivers/tty/sysrq.c @@ -44,6 +44,7 @@ #include #include #include +#include #include #include @@ -586,6 +587,7 @@ struct sysrq_state { /* reset sequence handling */ bool reset_canceled; + bool reset_requested; unsigned long reset_keybit[BITS_TO_LONGS(KEY_CNT)]; int reset_seq_len; int reset_seq_cnt; @@ -624,18 +626,26 @@ static void sysrq_parse_reset_sequence(struct sysrq_state *state) state->reset_seq_version = sysrq_reset_seq_version; } -static void sysrq_do_reset(unsigned long dummy) +static void sysrq_do_reset(unsigned long _state) { - __handle_sysrq(sysrq_xlate[KEY_B], false); + struct sysrq_state *state = (struct sysrq_state *) _state; + + state->reset_requested = true; + + sys_sync(); + kernel_restart(NULL); } static void sysrq_handle_reset_request(struct sysrq_state *state) { + if (state->reset_requested) + __handle_sysrq(sysrq_xlate[KEY_B], false); + if (sysrq_reset_downtime_ms) mod_timer(&state->keyreset_timer, jiffies + msecs_to_jiffies(sysrq_reset_downtime_ms)); else - sysrq_do_reset(0); + sysrq_do_reset((unsigned long)state); } static void sysrq_detect_reset_sequence(struct sysrq_state *state, @@ -837,7 +847,8 @@ static int sysrq_connect(struct input_handler *handler, sysrq->handle.handler = handler; sysrq->handle.name = "sysrq"; sysrq->handle.private = sysrq; - setup_timer(&sysrq->keyreset_timer, sysrq_do_reset, 0); + setup_timer(&sysrq->keyreset_timer, + sysrq_do_reset, (unsigned long)sysrq); error = input_register_handle(&sysrq->handle); if (error) { -- 2.20.1