lkml.org 
[lkml]   [2010]   [Jun]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 14/31] vc: Locking clean up
Date
From: Alan Cox <alan@linux.intel.com>

The virtual console layer uses the BKL for various things that don't really
need it. Clean them out.

Signed-off-by: Alan Cox <alan@linux.intel.com>
---
drivers/char/selection.c | 4 ++++
drivers/char/vt.c | 7 ++++---
2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/char/selection.c b/drivers/char/selection.c
index f97b9e8..6e79340 100644
--- a/drivers/char/selection.c
+++ b/drivers/char/selection.c
@@ -26,6 +26,7 @@
#include <linux/selection.h>
#include <linux/tiocl.h>
#include <linux/console.h>
+#include <linux/smp_lock.h>

/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
#define isspace(c) ((c) == ' ')
@@ -312,6 +313,8 @@ int paste_selection(struct tty_struct *tty)
struct tty_ldisc *ld;
DECLARE_WAITQUEUE(wait, current);

+ lock_kernel();
+
acquire_console_sem();
poke_blanked_console();
release_console_sem();
@@ -335,5 +338,6 @@ int paste_selection(struct tty_struct *tty)
__set_current_state(TASK_RUNNING);

tty_ldisc_deref(ld);
+ unlock_kernel();
return 0;
}
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 7cdb6ee..9f42b1f 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -280,8 +280,12 @@ static inline unsigned short *screenpos(struct vc_data *vc, int offset, int view
return p;
}

+/* Called from the keyboard irq path.. */
static inline void scrolldelta(int lines)
{
+ /* FIXME */
+ /* scrolldelta needs some kind of consistency lock, but the BKL was
+ and still is not protecting versus the scheduled back end */
scrollback_delta += lines;
schedule_console_callback();
}
@@ -2604,8 +2608,6 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
return -EFAULT;
ret = 0;

- lock_kernel();
-
switch (type)
{
case TIOCL_SETSEL:
@@ -2680,7 +2682,6 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
ret = -EINVAL;
break;
}
- unlock_kernel();
return ret;
}

--
1.7.0.4


\
 
 \ /
  Last update: 2010-06-01 23:03    [W:0.219 / U:0.048 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site