fbcon: allow fbcon to use the primary display driver

Allow fbcon to select the primary display adapter using the
fb_is_primary_device() arch-specific helper.  If a a primary adapter is
detected, fbcon will unbind the old adapter from the VT layer, then rebind
using the new adapter.  This requires that bind_/unbind_con_driver() be made
public.

Because this feature may produce unexpected behavior (from the user's POV),
this must be explicitly enabled in Kconfig.

[akpm@linux-foundation.org: export unbind_con_driver]
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 349673d432f1..8a389b314624 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2869,8 +2869,7 @@ int __init vty_init(void)
 
 static struct class *vtconsole_class;
 
-static int bind_con_driver(const struct consw *csw, int first, int last,
-                           int deflt)
+int bind_con_driver(const struct consw *csw, int first, int last, int deflt)
 {
         struct module *owner = csw->owner;
         const char *desc = NULL;
@@ -2969,6 +2968,7 @@ err:
         module_put(owner);
         return retval;
 };
+EXPORT_SYMBOL(bind_con_driver);
 
 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
 static int con_is_graphics(const struct consw *csw, int first, int last)
@@ -2987,8 +2987,7 @@ static int con_is_graphics(const struct consw *csw, int first, int last)
         return retval;
 }
 
-static int unbind_con_driver(const struct consw *csw, int first, int last,
-                             int deflt)
+int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
 {
         struct module *owner = csw->owner;
         const struct consw *defcsw = NULL;
@@ -3073,6 +3072,7 @@ err:
         return retval;
 
 }
+EXPORT_SYMBOL(unbind_con_driver);
 
 static int vt_bind(struct con_driver *con)
 {