linux-toradex.git/drivers/tty/tty_io.c, branch v3.6.1

tty: Revert the tty locking series, it needs more work

2012-06-02T22:21:43+00:00

This reverts the tty layer change to use per-tty locking, because it's
not correct yet, and fixing it will require some more deep surgery.

The main revert is d29f3ef39be4 ("tty_lock: Localise the lock"), but
there are several smaller commits that built upon it, they also get
reverted here. The list of reverted commits is:

  fde86d310886 - tty: add lockdep annotations
  8f6576ad476b - tty: fix ldisc lock inversion trace
  d3ca8b64b97e - pty: Fix lock inversion
  b1d679afd766 - tty: drop the pty lock during hangup
  abcefe5fc357 - tty/amiserial: Add missing argument for tty_unlock()
  fd11b42e3598 - cris: fix missing tty arg in wait_event_interruptible_tty call
  d29f3ef39be4 - tty_lock: Localise the lock

The revert had a trivial conflict in the 68360serial.c staging driver
that got removed in the meantime.

Signed-off-by: Linus Torvalds

tty_lock: Localise the lock

2012-05-04T23:58:47+00:00

In each remaining case the tty_lock is associated with a specific tty. This
means we can now lock on a per tty basis. We do need tty_lock_pair() for
the pty case. Uglier but still a step in the right direction.

[fixed up calls in 3 missing drivers - gregkh]

Signed-off-by: Alan Cox 
Acked-by: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

tty_lock: undo the old tty_lock use on the ctty

2012-05-04T23:47:38+00:00

get_current_tty has its own consistent locking. That means a pile of the
tty lock cases are not needed. As get_current_tty also keeps a reference the
tty object lifetime means we can propogate the lock removal out.

Signed-off-by: Alan Cox 
Signed-off-by: Greg Kroah-Hartman

Remove all #inclusions of asm/system.h

2012-03-28T17:30:03+00:00

Remove all #inclusions of asm/system.h preparatory to splitting and killing
it.  Performed with the following command:

perl -p -i -e 's!^#\s*include\s*.*\n!!' `grep -Irl '^#\s*include\s*' *`

Signed-off-by: David Howells

TTY: remove tty driver re-set from tty_reopen

2012-03-08T19:38:50+00:00

This is from tty_reopen:
    struct tty_driver *driver = tty->driver;
    ...
    tty->driver = driver;
and it doesn't make sense at all. The driver is intended to be set in
initialize_tty_struct from tty_init_dev (initial open). So this set in
tty_reopen is not needed.

Signed-off-by: Jiri Slaby 
Signed-off-by: Greg Kroah-Hartman

TTY: simplify tty_driver_lookup_tty a bit

2012-03-08T19:38:50+00:00

Remove the useless local variable and return the value itself.

Signed-off-by: Jiri Slaby 
Signed-off-by: Greg Kroah-Hartman

TTY: let alloc_tty_driver deduce the owner automatically

2012-03-08T19:30:21+00:00

Like the rest of the kernel, make a stub from alloc_tty_driver which
calls __alloc_tty_driver with proper owner. This will save us one more
assignment on the driver side.

Also this fixes some drivers which didn't set the owner. This allowed
user to remove the module from the system even though a tty from the
driver is still open.

Signed-off-by: Jiri Slaby 
Signed-off-by: Greg Kroah-Hartman

TTY: tty_io, remove buffer re-assignments

2012-03-08T19:30:21+00:00

TTY buffer head and tail are initialized in tty_buffer_init. No need
to do it once again in initialize_tty_struct where tty_buffer_init is
called.

Signed-off-by: Jiri Slaby 
Signed-off-by: Greg Kroah-Hartman

Revert "TTY: get rid of BTM around devpts_*"

2012-02-24T21:55:54+00:00

This reverts commit d3bda5298aad98c7a27678bdd0dd9d008ab9e685.

Sasha reported that this causes problems, so revert it.

Cc: Sasha Levin 
Cc: Jiri Slaby 
Signed-off-by: Greg Kroah-Hartman

TTY: get rid of BTM around devpts_*

2012-02-02T23:10:46+00:00

devpts operations are protected by inode mutexes and dentry
refcounting. There is no need to hold BTM.

Signed-off-by: Jiri Slaby 
Signed-off-by: Greg Kroah-Hartman