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: NMichal Januszewski <spock@gentoo.org>
Acked-by: NKrzysztof Helt <krzysztof.h1@wp.pl>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

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 */
 	}

drivers/video/Kconfig

@@ -76,6 +76,14 @@ config FB_DDC
        select I2C
        default n
 
+config FB_BOOT_VESA_SUPPORT
+	bool
+	depends on FB
+	default n
+	---help---
+	  If true, at least one selected framebuffer driver can take advantage
+	  of VESA video modes set at an early boot stage via the vga= parameter.
+
 config FB_CFB_FILLRECT
 	tristate
 	depends on FB
@@ -681,6 +689,7 @@ config FB_VESA
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
+	select FB_BOOT_VESA_SUPPORT
 	help
 	  This is the frame buffer device driver for generic VESA 2.0
 	  compliant graphic cards. The older VESA 1.2 cards are not supported.
@@ -1117,6 +1126,7 @@ config FB_INTEL
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
+	select FB_BOOT_VESA_SUPPORT
 	help
 	  This driver supports the on-board graphics built in to the Intel
           830M/845G/852GM/855GM/865G/915G/915GM/945G/945GM/965G/965GM chipsets.
@@ -1469,6 +1479,7 @@ config FB_SIS
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
+	select FB_BOOT_VESA_SUPPORT
 	help
 	  This is the frame buffer device driver for the SiS 300, 315, 330
 	  and 340 series as well as XGI V3XT, V5, V8, Z7 graphics chipsets.