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[PATCH] Fix EDD to properly ignore signature of non-existing drives 

Some BIOSes do not always set CF on error before return from int13.  The
patch adds additional check for status being zero (AH == 0).

Signed-off-by: Andrey Borzenkov <arvidjaar@mail.ru>
Cc: Matt Domsch <Matt_Domsch@dell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andrey Borzenkov 2006-03-25 03:07:07 -08:00 committed by Linus Torvalds
parent 9871728b75
commit 2c3ca07d2f
1 changed files with 2 additions and 0 deletions
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arch/i386/boot/edd.S
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@ -76,6 +76,8 @@ edd_mbr_sig_read:
popw %es
popw %bx
jc edd_mbr_sig_done # on failure, we're done.
cmpb $0, %ah # some BIOSes do not set CF
jne edd_mbr_sig_done # on failure, we're done.
movl (EDDBUF+EDD_MBR_SIG_OFFSET), %eax # read sig out of the MBR
movl %eax, (%bx) # store success
incb (EDD_MBR_SIG_NR_BUF) # note that we stored something