iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
linux/drivers/tty
History
Jiri Olsa 54f19b4a67 tty/serial/8250: Touch NMI watchdog in wait_for_xmitr 
First loop in wait_for_xmitr could also trigger NMI
watchdog in case reading from the port is slow:

  PID: 0      TASK: ffffffff819c1460  CPU: 0   COMMAND: "swapper/0"
   #0 [ffff88019f405e58] crash_nmi_callback at ffffffff8104d382
   #1 [ffff88019f405e68] nmi_handle at ffffffff8168ead9
   #2 [ffff88019f405eb0] do_nmi at ffffffff8168ec53
   #3 [ffff88019f405ef0] end_repeat_nmi at ffffffff8168df13
      [exception RIP: delay_tsc+50]
      RIP: ffffffff81325642  RSP: ffff88019f403bb0  RFLAGS: 00000083
      RAX: 00000000000005c8  RBX: ffffffff81f83000  RCX: 0000024e4fb88a8b
      RDX: 0000024e4fb89053  RSI: 0000000000000000  RDI: 00000000000007d1
      RBP: ffff88019f403bb0   R8: 000000000000000a   R9: 0000000000000000
      R10: 0000000000000000  R11: ffff88019f403ad6  R12: 000000000000250f
      R13: 0000000000000020  R14: ffffffff81d360c7  R15: 0000000000000047
      ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
  --- <NMI exception stack> ---
   #4 [ffff88019f403bb0] delay_tsc at ffffffff81325642
   #5 [ffff88019f403bb8] __const_udelay at ffffffff813255a8
   #6 [ffff88019f403bc8] wait_for_xmitr at ffffffff81404390
   #7 [ffff88019f403bf0] serial8250_console_putchar at ffffffff8140455c
   #8 [ffff88019f403c10] uart_console_write at ffffffff813ff00a
   #9 [ffff88019f403c40] serial8250_console_write at ffffffff814044ae
  #10 [ffff88019f403c88] call_console_drivers.constprop.15 at ffffffff81086b01
  #11 [ffff88019f403cb0] console_unlock at ffffffff8108842f
  #12 [ffff88019f403ce8] vprintk_emit at ffffffff81088834
  #13 [ffff88019f403d58] vprintk_default at ffffffff81088ba9
  #14 [ffff88019f403d68] printk at ffffffff8167f034

Adding touch_nmi_watchdog call to the first loop as well.

Reported-by: Chunyu Hu <chuhu@redhat.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-09-22 11:45:08 +02:00
..
hvc
tty/hvc: Use opal irqchip interface if available
2016-07-27 12:38:20 +10:00
ipwireless
tty: ipwireless, cleanup TIOCGSERIAL
2016-06-25 08:56:30 -07:00
serial
tty/serial/8250: Touch NMI watchdog in wait_for_xmitr
2016-09-22 11:45:08 +02:00
vt
vt: Emulate \e[100-107m (bright background colors).
2016-09-22 11:41:54 +02:00
amiserial.c
tty: Replace ASYNC_INITIALIZED bit and update atomically
2016-04-30 09:26:55 -07:00
bfin_jtag_comm.c
…
cyclades.c
tty: stop defining STD_COM_FLAGS in drivers
2016-06-25 08:56:30 -07:00
ehv_bytechan.c
drivers/tty: make ehv_bytechan.c explicitly non-modular
2016-02-06 23:26:43 -08:00
goldfish.c
tty: goldfish: support platform_device with id -1
2016-03-07 16:11:14 -08:00
isicom.c
tty: Replace ASYNC_INITIALIZED bit and update atomically
2016-04-30 09:26:55 -07:00
Kconfig
devpts: Make each mount of devpts an independent filesystem.
2016-06-05 10:36:01 -07:00
Makefile
TTY: Add MIPS EJTAG Fast Debug Channel TTY driver
2015-03-31 12:04:12 +02:00
metag_da.c
timers, drivers/tty/metag_da: Initialize the poll timer as pinned
2016-07-07 10:25:14 +02:00
mips_ejtag_fdc.c
timers, drivers/tty/mips_ejtag: Initialize the poll timer as pinned
2016-07-07 10:34:59 +02:00
moxa.c
tty: Replace ASYNC_INITIALIZED bit and update atomically
2016-04-30 09:26:55 -07:00
moxa.h
…
mxser.c
tty: cyclades+mxser, do not initialize to zero
2016-06-25 08:56:30 -07:00
mxser.h
…
n_gsm.c
TTY and Serial driver update for 4.7-rc1
2016-05-20 20:57:27 -07:00
n_hdlc.c
Fix OpenSSH pty regression on close
2016-05-01 13:22:54 -07:00
n_r3964.c
tty: r3964: Replace/remove bogus tty lock use
2015-10-17 21:11:29 -07:00
n_tracerouter.c
n_tracerouter: stop including <asm-generic/bug>
2015-10-15 00:21:10 +02:00
n_tracesink.c
n_tracesink: stop including <asm-generic/bug>
2015-10-15 00:21:11 +02:00
n_tracesink.h
…
n_tty.c
Fix OpenSSH pty regression on close
2016-05-01 13:22:54 -07:00
nozomi.c
tty: Replace TTY_THROTTLED bit tests with tty_throttled()
2016-04-30 09:26:55 -07:00
pty.c
pty: make ptmx file ops read-only after init
2016-09-15 12:47:03 +02:00
rocket_int.h
tty: rocket: Remove private close_wait
2016-01-28 14:13:44 -08:00
rocket.c
TTY: add __init attribute
2016-04-30 09:26:55 -07:00
rocket.h
tty: rocket: fix comment of ROCKET_SPD_HI
2015-05-24 12:49:16 -07:00
synclink_gt.c
TTY and Serial driver update for 4.7-rc1
2016-05-20 20:57:27 -07:00
synclink.c
TTY and Serial driver update for 4.7-rc1
2016-05-20 20:57:27 -07:00
synclinkmp.c
TTY and Serial driver update for 4.7-rc1
2016-05-20 20:57:27 -07:00
sysrq.c
mm: oom: add memcg to oom_control
2016-07-26 16:19:19 -07:00
tty_audit.c
tty: audit: remove unused variable
2016-03-07 16:11:14 -08:00
tty_buffer.c
Fix OpenSSH pty regression on close
2016-05-01 13:22:54 -07:00
tty_io.c
Merge 4.6-rc7 into tty-next
2016-05-09 09:39:13 +02:00
tty_ioctl.c
tty: Replace TTY_THROTTLED bit tests with tty_throttled()
2016-04-30 09:26:55 -07:00
tty_ldisc.c
tty: Eliminate global symbol tty_ldisc_N_TTY
2016-01-27 15:13:28 -08:00
tty_ldsem.c
tty: Deinline __ldsem_down_write_nested, save 128 bytes
2015-12-13 19:59:48 -08:00
tty_mutex.c
Merge 4.5-rc4 into tty-next
2016-02-14 14:36:04 -08:00
tty_port.c
tty: Replace ASYNC_INITIALIZED bit and update atomically
2016-04-30 09:26:55 -07:00