Peter Hurley f9e053dcfc tty: Serialize tty flow control changes with flow_lock ...

Without serialization, the flow control state can become inverted
wrt. the actual hardware state. For example,

CPU 0                          | CPU 1
stop_tty()                     |
  lock ctrl_lock               |
  tty->stopped = 1             |
  unlock ctrl_lock             |
                               | start_tty()
                               |   lock ctrl_lock
                               |   tty->stopped = 0
                               |   unlock ctrl_lock
                               |   driver->start()
  driver->stop()               |

In this case, the flow control state now indicates the tty has
been started, but the actual hardware state has actually been stopped.

Introduce tty->flow_lock spinlock to serialize tty flow control changes.
Split out unlocked __start_tty()/__stop_tty() flavors for use by
ioctl(TCXONC) in follow-on patch.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2014-09-23 21:19:35 -07:00

..

hvc

tty: Update hypervisor tty drivers to use core stdout parsing code.

2014-06-26 17:12:23 +01:00

ipwireless

tty: ipwireless: Remove tty->closing abort from ipw_open()

2014-07-10 16:06:49 -07:00

serial

serial: core: Use spin_lock_irq() in uart_set_termios()

2014-09-23 21:19:35 -07:00

vt

tty/vt/keyboard: Resolve many shadow warnings

2014-09-08 16:30:43 -07:00

amiserial.c

tty/amiserial: avoid interruptible_sleep_on

2014-01-07 17:05:21 -08:00

bfin_jtag_comm.c

TTY: bfin_jtag_comm: fix incorrect placement of __initdata tag

2013-09-30 19:09:37 -07:00

cyclades.c

tty: Remove tty_hung_up_p() tests from tty drivers' open()

2014-07-10 16:06:49 -07:00

ehv_bytechan.c

tty: Update hypervisor tty drivers to use core stdout parsing code.

2014-06-26 17:12:23 +01:00

goldfish.c

goldfish: clean up the checkpatch warnings

2014-05-15 13:20:42 -07:00

isicom.c

TTY: switch tty_flip_buffer_push

2013-01-15 22:30:15 -08:00

Kconfig

drivers/tty: ehv_bytechan fails to build as a module

2014-01-09 17:52:12 -06:00

Makefile

tty: Add timed, writer-prioritized rw semaphore

2013-05-20 12:30:32 -07:00

metag_da.c

tree-wide: use reinit_completion instead of INIT_COMPLETION

2013-11-15 09:32:21 +09:00

moxa.c

TTY: fix decimal printf format specifiers prefixed with 0x

2014-09-08 15:51:35 -07:00

moxa.h

…

mxser.c

tty: mxser: Fix build warning introduced by dfc7b837c7f9 (Re: linux-next: build warning after merge of the tty.current tree)

2013-05-22 10:26:02 -07:00

mxser.h

…

n_gsm.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

2014-08-06 09:38:14 -07:00

n_hdlc.c

drivers/tty/n_hdlc.c: replace kmalloc/memset by kzalloc

2014-05-28 13:33:18 -07:00

n_r3964.c

tty: Always handle NULL flag ptr

2013-12-08 16:56:05 -08:00

n_tracerouter.c

…

n_tracesink.c

…

n_tracesink.h

…

n_tty.c

tty: Fix spurious poll() wakeups

2014-09-08 15:55:25 -07:00

nozomi.c

drivers/tty/nozomi.c: Use 'nozomi_setup_memory' instead of 'setup_memory'

2014-09-08 16:09:23 -07:00

pty.c

drivers: tty: Fix use-after-free in pty_common_install

2014-07-12 17:21:47 -07:00

rocket_int.h

…

rocket.c

tty: remove DEFINE_PCI_DEVICE_TABLE macro

2013-12-08 17:09:07 -08:00

rocket.h

…

synclink_gt.c

synclink_gt: use pci_zalloc_consistent

2014-08-08 15:57:30 -07:00

synclink.c

tty: Remove tty_hung_up_p() tests from tty drivers' open()

2014-07-10 16:06:49 -07:00

synclinkmp.c

tty: Remove tty_hung_up_p() tests from tty drivers' open()

2014-07-10 16:06:49 -07:00

sysrq.c

mm, oom: ensure memoryless node zonelist always includes zones

2014-08-06 18:01:21 -07:00

tty_audit.c

audit: anchor all pid references in the initial pid namespace

2014-03-20 10:11:55 -04:00

tty_buffer.c

Staging: speakup: Update __speakup_paste_selection() tty (ab)usage to match vt

2014-05-24 02:25:11 +09:00

tty_io.c

tty: Serialize tty flow control changes with flow_lock

2014-09-23 21:19:35 -07:00

tty_ioctl.c

tty: fix typo in comment of tty_termios_encode_baud_rate

2014-09-08 15:32:05 -07:00

tty_ldisc.c

tty: delete non-required instances of include <linux/init.h>

2014-01-07 17:05:21 -08:00

tty_ldsem.c

lockdep: Make held_lock->check and "int check" argument bool

2014-02-09 21:18:54 +01:00

tty_mutex.c

tty: tty_mutex.c: Fixed coding style warning (using printk)

2012-10-24 11:34:51 -07:00

tty_port.c

tty: Remove tty_hung_up_p() tests from tty drivers' open()

2014-07-10 16:06:49 -07:00