Merge tag 'tty-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial updates from Greg KH:
 "Here is the big tty/serial driver pull request for 4.15-rc1.

  Lots of serial driver updates in here, some small vt cleanups, and a
  raft of SPDX and license boilerplate cleanups, messing up the diffstat
  a bit.

  Nothing major, with no realy functional changes except better hardware
  support for some platforms.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'tty-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (110 commits)
  tty: ehv_bytechan: fix spelling mistake
  tty: serial: meson: allow baud-rates lower than 9600
  serial: 8250_fintek: Fix crash with baud rate B0
  serial: 8250_fintek: Disable delays for ports != 0
  serial: 8250_fintek: Return -EINVAL on invalid configuration
  tty: Remove redundant license text
  tty: serdev: Remove redundant license text
  tty: hvc: Remove redundant license text
  tty: serial: Remove redundant license text
  tty: add SPDX identifiers to all remaining files in drivers/tty/
  tty: serial: jsm: remove redundant pointer ts
  tty: serial: jsm: add space before the open parenthesis '('
  tty: serial: jsm: fix coding style
  tty: serial: jsm: delete space between function name and '('
  tty: serial: jsm: add blank line after declarations
  tty: serial: jsm: change the type of local variable
  tty: serial: imx: remove dead code imx_dma_rxint
  tty: serial: imx: disable ageing timer interrupt if dma in use
  serial: 8250: fix potential deadlock in rs485-mode
  serial: m32r_sio: Drop redundant .data assignment
  ...

1 files changed, 11 insertions, 7 deletions

diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index d008f5a75197..b674793be478 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -246,8 +246,10 @@ static void sysrq_handle_showallcpus(int key)
          * architecture has no support for it:
          */
         if (!trigger_all_cpu_backtrace()) {
-                struct pt_regs *regs = get_irq_regs();
+                struct pt_regs *regs = NULL;
 
+                if (in_irq())
+                        regs = get_irq_regs();
                 if (regs) {
                         pr_info("CPU%d:\n", smp_processor_id());
                         show_regs(regs);
@@ -266,7 +268,10 @@ static struct sysrq_key_op sysrq_showallcpus_op = {
 
 static void sysrq_handle_showregs(int key)
 {
-        struct pt_regs *regs = get_irq_regs();
+        struct pt_regs *regs = NULL;
+
+        if (in_irq())
+                regs = get_irq_regs();
         if (regs)
                 show_regs(regs);
         perf_event_print_debug();
@@ -649,9 +654,9 @@ 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 _state)
+static void sysrq_do_reset(struct timer_list *t)
 {
-        struct sysrq_state *state = (struct sysrq_state *) _state;
+        struct sysrq_state *state = from_timer(state, t, keyreset_timer);
 
         state->reset_requested = true;
 
@@ -668,7 +673,7 @@ static void sysrq_handle_reset_request(struct sysrq_state *state)
                 mod_timer(&state->keyreset_timer,
                         jiffies + msecs_to_jiffies(sysrq_reset_downtime_ms));
         else
-                sysrq_do_reset((unsigned long)state);
+                sysrq_do_reset(&state->keyreset_timer);
 }
 
 static void sysrq_detect_reset_sequence(struct sysrq_state *state,
@@ -904,8 +909,7 @@ 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, (unsigned long)sysrq);
+        timer_setup(&sysrq->keyreset_timer, sysrq_do_reset, 0);
 
         error = input_register_handle(&sysrq->handle);
         if (error) {