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, 1 insertions, 3 deletions

diff --git a/arch/i386/video/fbdev.c b/arch/i386/video/fbdev.c
index 7fc712c46a64..48fb38d7d2c0 100644
--- a/arch/i386/video/fbdev.c
+++ b/arch/i386/video/fbdev.c
@@ -13,13 +13,11 @@
 
 int fb_is_primary_device(struct fb_info *info)
 {
-        struct device *device;
+        struct device *device = info->device;
         struct pci_dev *pci_dev = NULL;
         struct resource *res = NULL;
         int retval = 0;
 
-        device = info->device;
-
         if (device)
                 pci_dev = to_pci_dev(device);