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| author | Alan Cox <alan@lxorguk.ukuu.org.uk> | 2008-04-30 00:53:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 08:29:40 -0700 |
| commit | 04f378b198da233ca0aca341b113dc6579d46123 (patch) | |
| tree | 696e7bd401125cee71ecaa2047c4273f38732554 /include | |
| parent | e52384426064bca0669a954736206adca7595d48 (diff) | |
| download | linux-stable-04f378b198da233ca0aca341b113dc6579d46123.tar.gz linux-stable-04f378b198da233ca0aca341b113dc6579d46123.tar.bz2 linux-stable-04f378b198da233ca0aca341b113dc6579d46123.zip | |
tty: BKL pushdown
- 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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/tty.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h index 265831ccaa88..4d3702bade03 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -183,6 +183,7 @@ struct tty_struct { int index; struct tty_ldisc ldisc; struct mutex termios_mutex; + spinlock_t ctrl_lock; struct ktermios *termios, *termios_locked; char name[64]; struct pid *pgrp; @@ -323,8 +324,7 @@ extern void tty_ldisc_put(int); extern void tty_wakeup(struct tty_struct *tty); extern void tty_ldisc_flush(struct tty_struct *tty); -extern int tty_ioctl(struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg); +extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg); extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); |