Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

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  Hi,

Since the whole point is to detect the case where we don't have
a screen at all it makes sense to check several additional variables
and make certain that they are all 0.  Agreed?

Like in the attached patch?

cheers,
  Gerd
Refine SCREEN_INFO sanity check for vgacon initialization.

Checking video mode field only to see whenever SCREEN_INFO is
initialized is not enougth, in some cases it is zero although
a vga card is present.  Lets additionally check cols and lines.

Signed-off-by: Gerd Hoffmann <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Alan <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Eric W. Biederman <[email protected]>
---
 drivers/video/console/vgacon.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Index: vanilla-2.6.21-git11/drivers/video/console/vgacon.c
===================================================================
--- vanilla-2.6.21-git11.orig/drivers/video/console/vgacon.c
+++ vanilla-2.6.21-git11/drivers/video/console/vgacon.c
@@ -368,9 +368,14 @@ static const char *vgacon_startup(void)
 #endif
 	}
 
+	/* SCREEN_INFO initialized? */
+	if ((ORIG_VIDEO_MODE  == 0) &&
+	    (ORIG_VIDEO_LINES == 0) &&
+	    (ORIG_VIDEO_COLS  == 0))
+		goto no_vga;
+
 	/* VGA16 modes are not handled by VGACON */
-	if ((ORIG_VIDEO_MODE == 0x00) ||	/* SCREEN_INFO not initialized */
-	    (ORIG_VIDEO_MODE == 0x0D) ||	/* 320x200/4 */
+	if ((ORIG_VIDEO_MODE == 0x0D) ||	/* 320x200/4 */
 	    (ORIG_VIDEO_MODE == 0x0E) ||	/* 640x200/4 */
 	    (ORIG_VIDEO_MODE == 0x10) ||	/* 640x350/4 */
 	    (ORIG_VIDEO_MODE == 0x12) ||	/* 640x480/4 */

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