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x86/efi: Fix earlyprintk off-by-one bug 

Dave reported seeing the following incorrect output on his Thinkpad T420
when using earlyprintk=efi,

[    0.000000] efi: EFI v2.00 by Lenovo
                    ACPI=0xdabfe000  ACPI 2.0=0xdabfe014 SMBIOS=0xdaa9e000

The output should be on one line, not split over two. The cause is an
off-by-one error when checking that the efi_y coordinate hasn't been
incremented out of bounds.

Reported-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Matt Fleming 2013-11-11 16:18:59 +00:00
parent e0d59733f6
commit 1f3a8bae21
1 changed files with 1 additions and 1 deletions
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2
arch/x86/platform/efi/early_printk.c
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@ -142,7 +142,7 @@ early_efi_write(struct console *con, const char *str, unsigned int num)
efi_y += font->height;
}
if (efi_y + font->height >= si->lfb_height) {
if (efi_y + font->height > si->lfb_height) {
u32 i;
efi_y -= font->height;