This is a patch that delays updating the visible framebuffer console
until the other consoles have been initialized in order to avoid losing
output lines. This problem was discovered when loading a framebuffer driver
as a module. Comments welcome.
Jordan
[PATCH] vt: Delay the update of the visible framebuffer console
From: David Hollister <[email protected]>
This patch delays the update of the visible framebuffer console until
all other consoles have been initialized in order to avoid losing
information. This only seems to be a problem with modules, not with
built-in drivers.
Signed-off-by: David Hollister <[email protected]>
Signed-off-by: Jordan Crouse <[email protected]>
---
drivers/char/vt.c | 22 ++++++++++++++--------
1 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index acc5d47..30f0f24 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2700,9 +2700,11 @@ int take_over_console(const struct consw
if (!vc || !vc->vc_sw)
continue;
- j = i;
- if (CON_IS_VISIBLE(vc))
+ if (CON_IS_VISIBLE(vc)) {
+ j = i;
save_screen(vc);
+ }
+
old_was_color = vc->vc_can_do_color;
vc->vc_sw->con_deinit(vc);
vc->vc_origin = (unsigned long)vc->vc_screenbuf;
@@ -2718,17 +2720,21 @@ int take_over_console(const struct consw
*/
if (old_was_color != vc->vc_can_do_color)
clear_buffer_attributes(vc);
-
- if (CON_IS_VISIBLE(vc))
- update_screen(vc);
}
+
printk("Console: switching ");
if (!deflt)
printk("consoles %d-%d ", first+1, last+1);
- if (j >= 0)
+ if (j >= 0) {
+ struct vc_data *vc = vc_cons[j].d;
+
printk("to %s %s %dx%d\n",
- vc_cons[j].d->vc_can_do_color ? "colour" : "mono",
- desc, vc_cons[j].d->vc_cols, vc_cons[j].d->vc_rows);
+ vc->vc_can_do_color ? "colour" : "mono",
+ desc, vc->vc_cols, vc->vc_rows);
+
+ if (CON_IS_VISIBLE(vc))
+ update_screen(vc);
+ }
else
printk("to %s\n", desc);
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