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efifb: check that the base address is plausible on pci systems

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Some Apple machines have identical DMI data but different memory
configurations for the video.  Given that, check that the address in our
table is actually within the range of a PCI BAR on a VGA device in the
machine.

This also fixes up the return value from set_system(), which has always
been wrong, but never resulted in bad behavior since there's only ever
been one matching entry in the dmi table.

The patch

1) stops people's machines from crashing when we get their display wrong,
   which seems to be unfortunately inevitable,

2) allows us to support identical dmi data with differing video memory
   configurations

This also adds me as the efifb maintainer, since I've effectively been
acting as such for quite some time.

Signed-off-by: Peter Jones <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Peter Jones 2010-09-22 13:05:04 -07:00 • committed by Linus Torvalds
commit 85a00d9bbf
2 changed files with 55 additions and 12 deletions
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6
MAINTAINERS
View file

@ -2199,6 +2199,12 @@ W: http://acpi4asus.sf.net
S: Maintained
F: drivers/platform/x86/eeepc-laptop.c
EFIFB FRAMEBUFFER DRIVER
L: [email protected]
M: Peter Jones <[email protected]>
S: Maintained
F: drivers/video/efifb.c
EFS FILESYSTEM
W: http://aeschi.ch.eu.org/efs/
S: Orphan