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Refine SCREEN_INFO sanity check for vgacon initialization

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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 <kraxel@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
Cc: Alan <alan@lxorguk.ukuu.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Gerd Hoffmann 2007-05-16 22:11:09 -07:00 committed by Linus Torvalds
parent 79974a0e4c
commit a1a4849c41
1 changed files with 7 additions and 2 deletions
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9
drivers/video/console/vgacon.c
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@ -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 */