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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>
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1 changed files with 5 additions and 1 deletions
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@ -870,7 +870,11 @@ static unsigned int ata_id_xfermask(const u16 *id)
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* the PIO timing number for the maximum. Turn it into
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* a mask.
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*/
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pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
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u8 mode = id[ATA_ID_OLD_PIO_MODES] & 0xFF;
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if (mode < 5) /* Valid PIO range */
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pio_mask = (2 << mode) - 1;
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else
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pio_mask = 1;
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/* But wait.. there's more. Design your standards by
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* committee and you too can get a free iordy field to
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