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efifb: exit if framebuffer address is invalid

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efifb will attempt to ioremap a framebuffer even if its starting address
is 0, failing and causing an ugly backtrace in the process.  Exit before
probing if this is the case.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Acked-by: Peter Jones <pjones@redhat.com>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Garrett 2009-04-13 14:39:44 -07:00 committed by Linus Torvalds
parent 0ca1071f7d
commit 133bb070e9
1 changed files with 5 additions and 2 deletions
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7
drivers/video/efifb.c
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@ -210,12 +210,15 @@ static int __init efifb_probe(struct platform_device *dev)
unsigned int size_total;
int request_succeeded = 0;
printk(KERN_INFO "efifb: probing for efifb\n");
if (!screen_info.lfb_depth)
screen_info.lfb_depth = 32;
if (!screen_info.pages)
screen_info.pages = 1;
if (!screen_info.lfb_base) {
printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
return -ENODEV;
}
printk(KERN_INFO "efifb: probing for efifb\n");
/* just assume they're all unset if any are */
if (!screen_info.blue_size) {