linux.git/drivers/char/epca.c, branch v2.6.31

headers: smp_lock.h redux

2009-07-12T19:22:34+00:00

* Remove smp_lock.h from files which don't need it (including some headers!)
* Add smp_lock.h to files which do need it
* Make smp_lock.h include conditional in hardirq.h
  It's needed only for one kernel_locked() usage which is under CONFIG_PREEMPT

  This will make hardirq.h inclusion cheaper for every PREEMPT=n config
  (which includes allmodconfig/allyesconfig, BTW)

Signed-off-by: Alexey Dobriyan 
Signed-off-by: Linus Torvalds

tty: rewrite the ldisc locking

2009-06-11T15:51:01+00:00

There are several pretty much unfixable races in the old ldisc code, especially
with respect to pty behaviour and also to hangup. It's easier to rewrite the
code than simply try and patch it up.

This patch
- splits the ldisc from the tty (so we will be able to refcount it more cleanly
  later)
- introduces a mutex lock for ldisc changing on an active device
- fixes the complete mess that hangup caused
- implements hopefully correct setldisc/close/hangup locking

There are still some problems around pty pairs that have always been there but
at least it is now possible to understand the code and fix further problems.

This fixes the following known bugs
- hang up can leak ldisc references
- hang up may not call open/close on ldisc in a matched way
- pty/tty pairs can deadlock during an ldisc change
- reading the ldisc proc files can cause every ldisc to be loaded

and probably a few other of the mysterious ldisc race reports.

I'm sure it also adds the odd new one.

Signed-off-by: Alan Cox 
Signed-off-by: Linus Torvalds

epca: fix test_bit parameters

2009-06-11T15:50:58+00:00

Switch from ASYNC_* to ASYNCB_*, because test_bit expects
bit number, not mask.

Signed-off-by: Jiri Slaby 
Signed-off-by: Alan Cox 
Signed-off-by: Linus Torvalds

tty: Add carrier processing on close to the tty_port core

2009-06-11T15:50:56+00:00

Some drivers implement this internally, others miss it out. Push the
behaviour into the core code as that way everyone will do it consistently.

Update the dtr rts method to raise or lower depending upon flags. Having a
single method in this style fits most of the implementations more cleanly than
two funtions.

We need this in place before we tackle the USB side

Signed-off-by: Alan Cox 
Signed-off-by: Linus Torvalds

trivial: fix an -> a typos in documentation and comments

2009-01-06T10:28:07+00:00

It is always "an" if there is a vowel _spoken_ (not written).
So it is:
"an hour" (spoken vowel)
but
"a uniform" (spoken 'j')

Signed-off-by: Frederik Schwarzer 
Signed-off-by: Jiri Kosina

tty: Redo the rocket driver locking

2009-01-02T18:19:41+00:00

Bring this driver into the port locking model

Signed-off-by: Alan Cox 
Signed-off-by: Linus Torvalds

tty: Make epca use the port helpers

2009-01-02T18:19:41+00:00

Now the locking is straight and the port kref usage is straight we can
replace lots of chunks of code with the standard port helpers

Signed-off-by: Alan Cox 
Signed-off-by: Linus Torvalds

tty: refcount the epca driver

2009-01-02T18:19:41+00:00

Signed-off-by: Alan Cox 
Signed-off-by: Linus Torvalds

tty: relock epca

2009-01-02T18:19:41+00:00

Bring epca into line with the port locking.

Signed-off-by: Alan Cox 
Signed-off-by: Linus Torvalds

tty: Remove some pointless casts

2009-01-02T18:19:40+00:00

disc_data and driver_data are void *

Signed-off-by: Alan Cox 
Signed-off-by: Linus Torvalds