tty: BKL pushdown

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- Push the BKL down into the line disciplines
- Switch the tty layer to unlocked_ioctl
- Introduce a new ctrl_lock spin lock for the control bits
- Eliminate much of the lock_kernel use in n_tty
- Prepare to (but don't yet) call the drivers with the lock dropped
  on the paths that historically held the lock

BKL now primarily protects open/close/ldisc change in the tty layer

[jirislaby@gmail.com: a couple of fixes]
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

...

This commit is contained in:

Alan Cox 2008-04-30 00:53:29 -07:00 • committed by Linus Torvalds

parent e523844260

commit 04f378b198

9 changed files with 149 additions and 53 deletions

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24

drivers/char/n_hdlc.c

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16

drivers/char/n_r3964.c

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32

drivers/char/n_tty.c

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3

drivers/char/pty.c

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107

drivers/char/tty_io.c

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6

drivers/char/tty_ioctl.c

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8

drivers/char/vt.c

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2

fs/compat_ioctl.c

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4

include/linux/tty.h

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