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[PATCH] libata: Don't believe bogus claims in the older PIO mode register 

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan Cox 2006-09-29 18:26:47 +01:00 committed by Jeff Garzik
parent d223a60106
commit 46767aeba5
1 changed files with 5 additions and 1 deletions
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6
drivers/ata/libata-core.c
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@ -870,7 +870,11 @@ static unsigned int ata_id_xfermask(const u16 *id)
* the PIO timing number for the maximum. Turn it into
* a mask.
*/
pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
u8 mode = id[ATA_ID_OLD_PIO_MODES] & 0xFF;
if (mode < 5) /* Valid PIO range */
pio_mask = (2 << mode) - 1;
else
pio_mask = 1;
/* But wait.. there's more. Design your standards by
* committee and you too can get a free iordy field to