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libata and bogus LBA48 drives

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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>
This commit is contained in:
Geert Uytterhoeven 2007-10-29 21:21:37 +01:00 committed by Jeff Garzik
parent b55d1b1814
commit 17bd9a2f4c
1 changed files with 2 additions and 0 deletions
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2
include/linux/ata.h
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@ -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);
}