Ivo Sieben 98001214c0 tty: Use raw spin lock to protect the TTY read section ...

The "normal" spin lock that guards the N_TTY line discipline read section
is replaced by a raw spin lock.

On a PREEMP_RT system this prevents unwanted scheduling overhead when data is
read at the same time as data is being received: while RX IRQ threaded handling
is busy a TTY read call is performed from a RT priority > threaded IRQ priority.
The read call tries to take the read section spin lock (held by the threaded
IRQ) which blocks and causes a context switch to/from the threaded IRQ handler
until the spin lock is unlocked.

Signed-off-by: Ivo Sieben <meltedpianoman@gmail.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2013-02-04 15:05:04 -08:00

..

hvc

tty: Added a CONFIG_TTY option to allow removal of TTY

2013-01-18 16:15:27 -08:00

ipwireless

TTY: switch tty_flip_buffer_push

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

serial

serial: ralink: adds support for the serial core found on ralink wisoc

2013-01-30 00:15:34 -05:00

vt

TTY: switch tty_schedule_flip

2013-01-15 22:43:15 -08:00

amiserial.c

TTY: switch tty_flip_buffer_push

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

bfin_jtag_comm.c

TTY: switch tty_flip_buffer_push

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

cyclades.c

cyclades: push down tty_port_tty_get

2013-01-15 22:43:15 -08:00

ehv_bytechan.c

TTY: switch tty_flip_buffer_push

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

goldfish.c

goldfish: move to tty_port for flip buffers

2013-01-25 08:09:38 -08:00

isicom.c

TTY: switch tty_flip_buffer_push

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

Kconfig

goldfish: tty driver

2013-01-21 15:30:08 -08:00

Makefile

goldfish: tty driver

2013-01-21 15:30:08 -08:00

moxa.c

TTY: switch tty_schedule_flip

2013-01-15 22:43:15 -08:00

moxa.h

…

mxser.c

TTY: switch tty_flip_buffer_push

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

mxser.h

…

n_gsm.c

tty: Prevent deadlock in n_gsm driver

2013-01-30 12:10:09 +01:00

n_hdlc.c

…

n_r3964.c

tty: localise the lock

2012-08-10 12:55:47 -07:00

n_tracerouter.c

…

n_tracesink.c

…

n_tracesink.h

…

n_tty.c

tty: Use raw spin lock to protect the TTY read section

2013-02-04 15:05:04 -08:00

nozomi.c

TTY: nozomi, remove dead code

2013-01-15 22:43:16 -08:00

pty.c

Merge 3.8-rc5 into tty-next

2013-01-25 13:27:36 -08:00

rocket_int.h

…

rocket.c

tty: rocket: Explicitly list supported PCI IDs

2013-01-17 17:28:39 -08:00

rocket.h

…

synclink_gt.c

TTY: synclink: Convert + to | for bit operations

2013-01-30 00:09:58 -05:00

synclink.c

TTY: synclink: Convert + to | for bit operations

2013-01-30 00:09:58 -05:00

synclinkmp.c

TTY: synclink: Convert + to | for bit operations

2013-01-30 00:09:58 -05:00

sysrq.c

mm, oom: ensure sysrq+f always passes valid zonelist

2012-11-15 17:13:48 -08:00

tty_audit.c

TTY: audit, stop accessing tty->icount

2012-10-22 16:50:54 -07:00

tty_buffer.c

tty: Correct tty buffer flush.

2013-01-20 15:50:36 -08:00

tty_io.c

tty: Fix comments that reference BKL, eventd, old paths

2013-01-15 21:57:44 -08:00

tty_ioctl.c

tty: set_termios/set_termiox should not return -EINTR

2013-02-04 15:02:14 -08:00

tty_ldisc.c

tty: don't deadlock while flushing workqueue

2013-01-15 23:07:15 -08:00

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: introduce tty_port_destroy

2012-11-15 17:20:58 -08:00