From 17bd9a2f4c35de29d2539a2ff6851d61be281e25 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Mon, 29 Oct 2007 21:21:37 +0100
Subject: [PATCH] libata and bogus LBA48 drives
A colleague noticed recent versions of Ubuntu no longer detect his 80 GB
ST380020ACE drive. This drive is special in that it advertises LBA48 support,
but has the lba_capacity_2 field set to zero (cfr.
http://lkml.org/lkml/2004/3/30/163).
Upon closer look, libata indeed doesn't seem to handle this case yet.
Below is an (untested) fix.
Signed-off-by: Jeff Garzik <jeff@garzik.org>
---
include/linux/ata.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 61535e72834..304825b1c97 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -425,6 +425,8 @@ static inline int ata_id_has_lba48(const u16 *id)
{
if ((id[83] & 0xC000) != 0x4000)
return 0;
+ if (!ata_id_u64(id, 100))
+ return 0;
return id[83] & (1 << 10);
}
--
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