Merge git://oss.sgi.com:8090/oss/git/xfs-2.6

[sfrench/cifs-2.6.git] / drivers / char / vt.c

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index e91268e86833bf8322d883e10d69c6bd3ec80089..ca4844c527dae7d6fbbed8c13f6ea46c8f564f47 100644 (file)
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2489,7 +2489,7 @@ static int con_open(struct tty_struct *tty, struct file *filp)
 }
 
 /*
- * We take tty_sem in here to prevent another thread from coming in via init_dev
+ * We take tty_mutex in here to prevent another thread from coming in via init_dev
  * and taking a ref against the tty while we're in the process of forgetting
  * about it and cleaning things up.
  *
@@ -2497,7 +2497,7 @@ static int con_open(struct tty_struct *tty, struct file *filp)
  */
 static void con_close(struct tty_struct *tty, struct file *filp)
 {
-       down(&tty_sem);
+       mutex_lock(&tty_mutex);
        acquire_console_sem();
        if (tty && tty->count == 1) {
                struct vc_data *vc = tty->driver_data;
@@ -2507,15 +2507,15 @@ static void con_close(struct tty_struct *tty, struct file *filp)
                tty->driver_data = NULL;
                release_console_sem();
                vcs_remove_devfs(tty);
-               up(&tty_sem);
+               mutex_unlock(&tty_mutex);
                /*
-                * tty_sem is released, but we still hold BKL, so there is
+                * tty_mutex is released, but we still hold BKL, so there is
                 * still exclusion against init_dev()
                 */
                return;
        }
        release_console_sem();
-       up(&tty_sem);
+       mutex_unlock(&tty_mutex);
 }
 
 static void vc_init(struct vc_data *vc, unsigned int rows,
@@ -2758,29 +2758,6 @@ static void set_vesa_blanking(char __user *p)
     vesa_blank_mode = (mode < 4) ? mode : 0;
 }
 
-/*
- * This is called by a timer handler
- */
-static void vesa_powerdown(void)
-{
-    struct vc_data *c = vc_cons[fg_console].d;
-    /*
-     *  Power down if currently suspended (1 or 2),
-     *  suspend if currently blanked (0),
-     *  else do nothing (i.e. already powered down (3)).
-     *  Called only if powerdown features are allowed.
-     */
-    switch (vesa_blank_mode) {
-    case VESA_NO_BLANKING:
-           c->vc_sw->con_blank(c, VESA_VSYNC_SUSPEND+1, 0);
-           break;
-    case VESA_VSYNC_SUSPEND:
-    case VESA_HSYNC_SUSPEND:
-           c->vc_sw->con_blank(c, VESA_POWERDOWN+1, 0);
-           break;
-    }
-}
-
 void do_blank_screen(int entering_gfx)
 {
        struct vc_data *vc = vc_cons[fg_console].d;
@@ -2791,8 +2768,7 @@ void do_blank_screen(int entering_gfx)
        if (console_blanked) {
                if (blank_state == blank_vesa_wait) {
                        blank_state = blank_off;
-                       vesa_powerdown();
-
+                       vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
                }
                return;
        }
@@ -2822,7 +2798,7 @@ void do_blank_screen(int entering_gfx)
 
        save_screen(vc);
        /* In case we need to reset origin, blanking hook returns 1 */
-       i = vc->vc_sw->con_blank(vc, 1, 0);
+       i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
        console_blanked = fg_console + 1;
        if (i)
                set_origin(vc);
@@ -2830,13 +2806,10 @@ void do_blank_screen(int entering_gfx)
        if (console_blank_hook && console_blank_hook(1))
                return;
 
-       if (vesa_off_interval) {
+       if (vesa_off_interval && vesa_blank_mode) {
                blank_state = blank_vesa_wait;
                mod_timer(&console_timer, jiffies + vesa_off_interval);
        }
-
-       if (vesa_blank_mode)
-               vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
 }
 EXPORT_SYMBOL(do_blank_screen);
 
@@ -2896,9 +2869,9 @@ void unblank_screen(void)
 }
 
 /*
- * We defer the timer blanking to work queue so it can take the console semaphore
+ * We defer the timer blanking to work queue so it can take the console mutex
  * (console operations can still happen at irq time, but only from printk which
- * has the console semaphore. Not perfect yet, but better than no locking
+ * has the console mutex. Not perfect yet, but better than no locking
  */
 static void blank_screen_t(unsigned long dummy)
 {
@@ -3240,6 +3213,7 @@ void getconsxy(struct vc_data *vc, unsigned char *p)
 
 void putconsxy(struct vc_data *vc, unsigned char *p)
 {
+       hide_cursor(vc);
        gotoxy(vc, p[0], p[1]);
        set_cursor(vc);
 }
@@ -3260,6 +3234,14 @@ void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
        }
 }
 
+int is_console_suspend_safe(void)
+{
+       /* It is unsafe to suspend devices while X has control of the
+        * hardware. Make sure we are running on a kernel-controlled console.
+        */
+       return vc_cons[fg_console].d->vc_mode == KD_TEXT;
+}
+
 /*
  *     Visible symbols for modules
  */