[PATCH 1/1] [Maverick] UBUNTU: SAUCE: fbcon -- fix OOPs triggered by race prevention fixes

[Andy Whitcroft]

BugLink: http://bugs.launchpad.net/bugs/614008

The fix below added reference counting to framebuffer opens, it
inadvertantly does not handle the totally missing framebuffer case:

    UBUNTU: SAUCE: fbcon -- fix race between open and removal of framebuffers

lshw tickles this searching for framebuffers leading to an OOPs and boot
hangs for some machines.

Initial-fix-by: Dave Gilbert
Signed-off-by: Andy Whitcroft <apw at canonical.com>
---
 drivers/video/fbmem.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 02eb135..0088013 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1407,7 +1407,8 @@ __releases(&registered_lock)
 
 	spin_lock(&registered_lock);
 	fb_info = registered_fb[idx];
-	fb_info->ref_count++;
+	if (fb_info)
+		fb_info->ref_count++;
 	spin_unlock(&registered_lock);
 
 	return fb_info;
-- 
1.7.0.4