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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2008-04-30 00:53:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 08:29:40 -0700
commit04f378b198da233ca0aca341b113dc6579d46123 (patch)
tree696e7bd401125cee71ecaa2047c4273f38732554 /drivers/char/vt.c
parente52384426064bca0669a954736206adca7595d48 (diff)
downloadlinux-04f378b198da233ca0aca341b113dc6579d46123.tar.bz2
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 'drivers/char/vt.c')
-rw-r--r--drivers/char/vt.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 1c2660477135..e64f0bf3624e 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2541,6 +2541,9 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
if (get_user(type, p))
return -EFAULT;
ret = 0;
+
+ lock_kernel();
+
switch (type)
{
case TIOCL_SETSEL:
@@ -2560,7 +2563,7 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
ret = sel_loadlut(p);
break;
case TIOCL_GETSHIFTSTATE:
-
+
/*
* Make it possible to react to Shift+Mousebutton.
* Note that 'shift_state' is an undocumented
@@ -2615,6 +2618,7 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
ret = -EINVAL;
break;
}
+ unlock_kernel();
return ret;
}
@@ -3829,7 +3833,7 @@ static int con_font_get(struct vc_data *vc, struct console_font_op *op)
goto out;
c = (font.width+7)/8 * 32 * font.charcount;
-
+
if (op->data && font.charcount > op->charcount)
rc = -ENOSPC;
if (!(op->flags & KD_FONT_FLAG_OLD)) {