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authorMichal Januszewski <spock@gentoo.org>2008-10-15 22:03:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-16 11:21:45 -0700
commit4d31a2b74c6d063362ae10ce3be3e80d8713bf23 (patch)
treec125a2e581620a333437bcc5b3e75d24af928c58 /arch/x86/boot
parent5ab4840968cd094586f65fce978e35c66d25ac78 (diff)
fbdev: ignore VESA modes if framebuffer does not support them
Currently, it is possible to set a graphics VESA mode at boot time via the vga= parameter even when no framebuffer driver supporting this is configured. This could lead to the system booting with a black screen, without a usable console. Fix this problem by only allowing to set graphics modes at boot time if a supporting framebuffer driver is configured. Signed-off-by: Michal Januszewski <spock@gentoo.org> Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl> 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>
Diffstat (limited to 'arch/x86/boot')
-rw-r--r--arch/x86/boot/video-vesa.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/x86/boot/video-vesa.c b/arch/x86/boot/video-vesa.c
index 1e6fe0214c8..99b3079dc6a 100644
--- a/arch/x86/boot/video-vesa.c
+++ b/arch/x86/boot/video-vesa.c
@@ -88,14 +88,11 @@ static int vesa_probe(void)
(vminfo.memory_layout == 4 ||
vminfo.memory_layout == 6) &&
vminfo.memory_planes == 1) {
-#ifdef CONFIG_FB
+#ifdef CONFIG_FB_BOOT_VESA_SUPPORT
/* Graphics mode, color, linear frame buffer
supported. Only register the mode if
if framebuffer is configured, however,
- otherwise the user will be left without a screen.
- We don't require CONFIG_FB_VESA, however, since
- some of the other framebuffer drivers can use
- this mode-setting, too. */
+ otherwise the user will be left without a screen. */
mi = GET_HEAP(struct mode_info, 1);
mi->mode = mode + VIDEO_FIRST_VESA;
mi->depth = vminfo.bpp;
@@ -133,10 +130,12 @@ static int vesa_set_mode(struct mode_info *mode)
if ((vminfo.mode_attr & 0x15) == 0x05) {
/* It's a supported text mode */
is_graphic = 0;
+#ifdef CONFIG_FB_BOOT_VESA_SUPPORT
} else if ((vminfo.mode_attr & 0x99) == 0x99) {
/* It's a graphics mode with linear frame buffer */
is_graphic = 1;
vesa_mode |= 0x4000; /* Request linear frame buffer */
+#endif
} else {
return -1; /* Invalid mode */
}