[PATCH] fbcon: Stop cursor timer if console is inactive

If console is blanked or in KD_GRAPHICS mode, delete cursor timer.  No sense
flashing the cursor when there's nothing to be seen.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 52 insertions, 43 deletions

diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index bb4ea50b54a3..2e93224d2d55 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -331,6 +331,35 @@ static void cursor_timer_handler(unsigned long dev_addr)
         mod_timer(&ops->cursor_timer, jiffies + HZ/5);
 }
 
+static void fbcon_add_cursor_timer(struct fb_info *info)
+{
+        struct fbcon_ops *ops = info->fbcon_par;
+
+        if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
+            !(ops->flags & FBCON_FLAGS_CURSOR_TIMER)) {
+                if (!info->queue.func)
+                        INIT_WORK(&info->queue, fb_flashcursor, info);
+
+                init_timer(&ops->cursor_timer);
+                ops->cursor_timer.function = cursor_timer_handler;
+                ops->cursor_timer.expires = jiffies + HZ / 5;
+                ops->cursor_timer.data = (unsigned long ) info;
+                add_timer(&ops->cursor_timer);
+                ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
+        }
+}
+
+static void fbcon_del_cursor_timer(struct fb_info *info)
+{
+        struct fbcon_ops *ops = info->fbcon_par;
+
+        if (info->queue.func == fb_flashcursor &&
+            ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
+                del_timer_sync(&ops->cursor_timer);
+                ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
+        }
+}
+
 #ifndef MODULE
 static int __init fb_console_setup(char *this_opt)
 {
@@ -583,9 +612,7 @@ static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
         }
 
         if (!err) {
-                if (oldinfo->queue.func == fb_flashcursor)
-                        del_timer_sync(&ops->cursor_timer);
-
+                fbcon_del_cursor_timer(oldinfo);
                 kfree(ops->cursor_state.mask);
                 kfree(ops->cursor_data);
                 kfree(oldinfo->fbcon_par);
@@ -596,22 +623,6 @@ static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
         return err;
 }
 
-static void con2fb_init_newinfo(struct fb_info *info)
-{
-        if (!info->queue.func || info->queue.func == fb_flashcursor) {
-                struct fbcon_ops *ops = info->fbcon_par;
-
-                if (!info->queue.func)
-                        INIT_WORK(&info->queue, fb_flashcursor, info);
-
-                init_timer(&ops->cursor_timer);
-                ops->cursor_timer.function = cursor_timer_handler;
-                ops->cursor_timer.expires = jiffies + HZ / 5;
-                ops->cursor_timer.data = (unsigned long ) info;
-                add_timer(&ops->cursor_timer);
-        }
-}
-
 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
                                 int unit, int show_logo)
 {
@@ -695,7 +706,7 @@ static int set_con2fb_map(int unit, int newidx, int user)
                                  logo_shown != FBCON_LOGO_DONTSHOW);
 
                 if (!found)
-                        con2fb_init_newinfo(info);
+                        fbcon_add_cursor_timer(info);
                 con2fb_map_boot[unit] = newidx;
                 con2fb_init_display(vc, info, unit, show_logo);
         }
@@ -898,18 +909,7 @@ static const char *fbcon_startup(void)
         }
 #endif                          /* CONFIG_MAC */
 
-        /* Initialize the work queue. If the driver provides its
-         * own work queue this means it will use something besides 
-         * default timer to flash the cursor. */
-        if (!info->queue.func) {
-                INIT_WORK(&info->queue, fb_flashcursor, info);
-
-                init_timer(&ops->cursor_timer);
-                ops->cursor_timer.function = cursor_timer_handler;
-                ops->cursor_timer.expires = jiffies + HZ / 5;
-                ops->cursor_timer.data = (unsigned long ) info;
-                add_timer(&ops->cursor_timer);
-        }
+        fbcon_add_cursor_timer(info);
         return display_desc;
 }
 
@@ -1923,7 +1923,7 @@ static int fbcon_resize(struct vc_data *vc, unsigned int width,
 
 static int fbcon_switch(struct vc_data *vc)
 {
-        struct fb_info *info;
+        struct fb_info *info, *old_info = NULL;
         struct display *p = &fb_display[vc->vc_num];
         struct fb_var_screeninfo var;
         int i, prev_console;
@@ -1956,7 +1956,8 @@ static int fbcon_switch(struct vc_data *vc)
         }
 
         prev_console = ((struct fbcon_ops *)info->fbcon_par)->currcon;
-
+        if (prev_console != -1)
+                old_info = registered_fb[con2fb_map[prev_console]];
         /*
          * FIXME: If we have multiple fbdev's loaded, we need to
          * update all info->currcon.  Perhaps, we can place this
@@ -1984,10 +1985,12 @@ static int fbcon_switch(struct vc_data *vc)
         info->var.yoffset = info->var.xoffset = p->yscroll = 0;
         fb_set_var(info, &var);
 
-        if (prev_console != -1 &&
-            registered_fb[con2fb_map[prev_console]] != info &&
-            info->fbops->fb_set_par)
-                info->fbops->fb_set_par(info);
+        if (old_info != NULL && old_info != info) {
+                if (info->fbops->fb_set_par)
+                        info->fbops->fb_set_par(info);
+                fbcon_del_cursor_timer(old_info);
+                fbcon_add_cursor_timer(info);
+        }
 
         set_blitting_type(vc, info, p);
         ((struct fbcon_ops *)info->fbcon_par)->cursor_reset = 1;
@@ -2073,11 +2076,16 @@ static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
                                 fbcon_generic_blank(vc, info, blank);
                 }
 
-                if (!blank)
-                        update_screen(vc);
-        }
+                if (!blank)
+                        update_screen(vc);
+        }
+
+        if (!blank)
+                fbcon_add_cursor_timer(info);
+        else
+                fbcon_del_cursor_timer(info);
 
-        return 0;
+        return 0;
 }
 
 static void fbcon_free_font(struct display *p)
diff --git a/drivers/video/console/fbcon.h b/drivers/video/console/fbcon.h
index 5d377860bce2..08befafe11d1 100644
--- a/drivers/video/console/fbcon.h
+++ b/drivers/video/console/fbcon.h
@@ -18,7 +18,8 @@
 
 #include <asm/io.h>
 
-#define FBCON_FLAGS_INIT 1
+#define FBCON_FLAGS_INIT         1
+#define FBCON_FLAGS_CURSOR_TIMER 2
 
    /*
     *    This is the interface between the low-level console driver and the