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fbdev: ignore VESA modes if framebuffer does not support them

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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 <[email protected]>
Acked-by: Krzysztof Helt <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michal Januszewski 2008-10-15 22:03:51 -07:00 • committed by Linus Torvalds
commit 4d31a2b74c
2 changed files with 15 additions and 5 deletions
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11
drivers/video/Kconfig
View file

@ -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.