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Commit 46767aeb authored by Alan Cox's avatar Alan Cox Committed by Jeff Garzik
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[PATCH] libata: Don't believe bogus claims in the older PIO mode register 



Signed-off-by: default avatarAlan Cox <alan@redhat.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent d223a601

drivers/ata/libata-core.c

+5 −1
Original line number Diff line number Diff line
@@ -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