Commit 2c3ca07d authored Mar 25, 2006 by Andrey Borzenkov Committed by Linus Torvalds Mar 25, 2006

[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>

parent 9871728b

arch/i386/boot/edd.S

+2 −0

Original line number	Diff line number	Diff line
		@@ -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