Subject: [PATCH] Fix ghost entries under /sys/firmware/edd take 2
From: Andrey Borzenkov < arvidjaar@mail.ru>

Some BIOSes do not indicate error when trying to read from non-
existing device. Zero buffer before reading and check that we
actually got some data.

This was fixed in different way for edd.S in
http://marc.info/?l=linux-kernel&m=114087765422490&w=2, but lost
again when edd.S was rewritten in C.

Signed-off-by: Andrey Borzenkov < arvidjaar@mail.ru>

---

 arch/x86/boot/edd.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)


diff --git a/arch/x86/boot/edd.c b/arch/x86/boot/edd.c
index d93cbc6..0388234 100644
--- a/arch/x86/boot/edd.c
+++ b/arch/x86/boot/edd.c
@@ -58,11 +58,12 @@ static u32 read_mbr_sig(u8 devno, struct edd_info *ei, u32 *mbrsig)
 	if (mbrbuf_end > (char *)(size_t)boot_params.hdr.heap_end_ptr)
 		return -1;
 
+	memset(mbrbuf_ptr, 0, sector_size);
 	if (read_mbr(devno, mbrbuf_ptr))
 		return -1;
 
 	*mbrsig = *(u32 *)&mbrbuf_ptr[EDD_MBR_SIG_OFFSET];
-	return 0;
+	return -!*mbrsig;	/* treat zero signature as no sig */
 }
 
 static int get_edd_info(u8 devno, struct edd_info *ei)