[PATCH] fbcon: Avoid illegal display panning

Avoid calls to fb_pan_display when driver is suspended or not in text mode.

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

1 files changed, 19 insertions, 6 deletions

diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index bd4500a8992e..8068d2f7efe6 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -2146,8 +2146,12 @@ static int fbcon_switch(struct vc_data *vc)
 
         scrollback_max = 0;
         scrollback_current = 0;
-        ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
-        ops->update_start(info);
+
+        if (!fbcon_is_inactive(vc, info)) {
+            ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
+            ops->update_start(info);
+        }
+
         fbcon_set_palette(vc, color_table);     
         fbcon_clear_margins(vc, 0);
 
@@ -2746,8 +2750,12 @@ static void fbcon_modechanged(struct fb_info *info)
                 updatescrollmode(p, info, vc);
                 scrollback_max = 0;
                 scrollback_current = 0;
-                ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
-                ops->update_start(info);
+
+                if (!fbcon_is_inactive(vc, info)) {
+                    ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
+                    ops->update_start(info);
+                }
+
                 fbcon_set_palette(vc, color_table);
                 update_screen(vc);
                 if (softback_buf)
@@ -2784,8 +2792,13 @@ static void fbcon_set_all_vcs(struct fb_info *info)
                         updatescrollmode(p, info, vc);
                         scrollback_max = 0;
                         scrollback_current = 0;
-                        ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
-                        ops->update_start(info);
+
+                        if (!fbcon_is_inactive(vc, info)) {
+                            ops->var.xoffset = ops->var.yoffset =
+                                p->yscroll = 0;
+                            ops->update_start(info);
+                        }
+
                         fbcon_set_palette(vc, color_table);
                         update_screen(vc);
                         if (softback_buf)