[PATCH 00/41] TTY buffer in tty_port -- prep no. 4

[Jiri Slaby]

Hi,

this is the fourth, and hopefully the last, series of patches which
allow tty buffers to be moved from tty_struct (present from open to
close/hangup) to tty_port (present as long as the device). This will
allow us to get rid of the tty refcounting in the interrupt service
routines and other hot paths after we are done. This is because we
will not need to handle races among ISRs, timers, hangups and others,
because tty_port lives as long as an interrupt/timer tick may occur.
Unlike tty_struct.

In this series, the fourth batch of drivers is converted to use
tty_port. Last time I promised that all drivers have a tty_port. It
was not really true. Now it should be. Here we also continued
assigning tty_port to tty_struct->port. And we should be done with
that here too. I.e. for all in-kernel drivers we have tty->port set
after driver->ops->install returns. So the TTY layer now finally has
an access to a tty_port in all of the drivers.

Now we can start moving tty buffers to tty_port and get rid of all the
refcounting as was mentioned above.

As usual, standard x86 stuff was runtime-tested. The rest is only
checked to be compilation-errors free.

Jiri Slaby (41):
  TTY: pty, stop passing NULL to free_tty_struct
  TTY: 68328serial, fix compilation
  TTY: n_gsm, use tty_port_install
  misc: pti, add const to pci_device_id table
  misc: pti, pci drvdata cannot be NULL in ->remove
  misc: pti, stop using iomap's unmap on ioremap space
  misc: pti, move ->remove to the PCI code
  misc: pti, do the opposite of ->probe in ->remove
  misc: pti, fix fail paths
  misc: pti, fix tty_port count
  misc: pti, use tty_port_register_device
  mxser: allow overlapping vector
  TTY: ttyprintk, unregister tty driver on failure
  TTY: ttyprintk, don't touch behind tty->write_buf
  TTY: ttyprintk, initialize tty_port earlier
  TTY: tty3270, free tty driver properly
  TTY: pass flags to alloc_tty_driver
  TTY: pty, switch to tty_alloc_driver
  TTY: move allocations to tty_alloc_driver
  TTY: add support for unnumbered device nodes
  TTY: move cdev_add to tty_register_device
  TTY: use tty_port_register_device
  TTY: automatically create nodes for some drivers
  TTY: tty_port, add some documentation
  TTY: add tty_port_link_device
  TTY: use tty_port_link_device
  TTY: synclink_cs, sanitize fail paths
  TTY: synclink_cs, use dynamic tty devices
  TTY: synclink_cs, final cleanup in synclink_cs_init
  TTY: moxa, convert to dynamic device
  TTY: nfcon, add tty_port and link it
  TTY: con3215, unset raw3215[line]
  TTY: con3215, add tty install
  TTY: i4l, add tty install
  TTY: synclink, add tty install
  TTY: synclinkmp, add tty install
  TTY: ircomm_tty, add tty install
  TTY: tty3270, add tty install
  TTY: hvc_console, add tty install
  TTY: hvcs, clean hvcs_open a bit
  TTY: hvcs, add tty install

 arch/alpha/kernel/srmcons.c             |    1 +
 arch/ia64/hp/sim/simserial.c            |    1 +
 arch/m68k/emu/nfcon.c                   |    4 +
 arch/parisc/kernel/pdc_cons.c           |    1 +
 arch/um/drivers/line.c                  |    3 +-
 arch/xtensa/platforms/iss/console.c     |    1 +
 drivers/char/pcmcia/synclink_cs.c       |  105 ++++++++++-----------
 drivers/char/ttyprintk.c                |   29 +++---
 drivers/isdn/capi/capi.c                |    3 +-
 drivers/isdn/gigaset/interface.c        |    3 +-
 drivers/isdn/i4l/isdn_tty.c             |   25 +++--
 drivers/misc/pti.c                      |  128 ++++++++++++-------------
 drivers/mmc/card/sdio_uart.c            |    4 +-
 drivers/net/usb/hso.c                   |    7 +-
 drivers/s390/char/con3215.c             |   28 ++++--
 drivers/s390/char/sclp_tty.c            |    1 +
 drivers/s390/char/sclp_vt220.c          |    1 +
 drivers/s390/char/tty3270.c             |   34 +++++--
 drivers/staging/ipack/devices/ipoctal.c |    2 +-
 drivers/tty/amiserial.c                 |    9 +-
 drivers/tty/bfin_jtag_comm.c            |    1 +
 drivers/tty/cyclades.c                  |   16 ++--
 drivers/tty/ehv_bytechan.c              |    9 +-
 drivers/tty/hvc/hvc_console.c           |   31 +++++--
 drivers/tty/hvc/hvcs.c                  |   82 +++++++++-------
 drivers/tty/hvc/hvsi.c                  |    2 +
 drivers/tty/ipwireless/tty.c            |    2 +-
 drivers/tty/isicom.c                    |    3 +-
 drivers/tty/moxa.c                      |   24 ++++-
 drivers/tty/mxser.c                     |   41 ++++++--
 drivers/tty/n_gsm.c                     |   30 ++++--
 drivers/tty/nozomi.c                    |    4 +-
 drivers/tty/pty.c                       |   36 +++++---
 drivers/tty/rocket.c                    |    4 +-
 drivers/tty/serial/68328serial.c        |   23 +++--
 drivers/tty/serial/crisv10.c            |   11 ++-
 drivers/tty/serial/ifx6x60.c            |    4 +-
 drivers/tty/serial/msm_smd_tty.c        |    8 +-
 drivers/tty/serial/serial_core.c        |    3 +-
 drivers/tty/synclink.c                  |   44 +++++----
 drivers/tty/synclink_gt.c               |    7 +-
 drivers/tty/synclinkmp.c                |   28 ++++--
 drivers/tty/tty_io.c                    |  154 ++++++++++++++++++++-----------
 drivers/tty/tty_port.c                  |   43 ++++++++-
 drivers/usb/class/cdc-acm.c             |    3 +-
 drivers/usb/gadget/u_serial.c           |    3 +-
 include/linux/tty.h                     |    2 +
 include/linux/tty_driver.h              |   35 ++++++-
 net/bluetooth/rfcomm/tty.c              |    4 +-
 net/irda/ircomm/ircomm_tty.c            |   41 ++++----
 50 files changed, 692 insertions(+), 396 deletions(-)

-- 
1.7.10.4


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