efifb: exit if framebuffer address is invalid
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>
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@ -210,12 +210,15 @@ static int __init efifb_probe(struct platform_device *dev)
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unsigned int size_total;
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int request_succeeded = 0;
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printk(KERN_INFO "efifb: probing for efifb\n");
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if (!screen_info.lfb_depth)
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screen_info.lfb_depth = 32;
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if (!screen_info.pages)
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screen_info.pages = 1;
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if (!screen_info.lfb_base) {
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printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
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return -ENODEV;
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}
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printk(KERN_INFO "efifb: probing for efifb\n");
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/* just assume they're all unset if any are */
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if (!screen_info.blue_size) {
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