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

[Alan Cox]

Signed-off-by: Alan Cox <alan@xxxxxxxxxx>

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.18-mm2/drivers/ata/libata-core.c linux-2.6.18-mm2/drivers/ata/libata-core.c
--- linux.vanilla-2.6.18-mm2/drivers/ata/libata-core.c	2006-09-28 14:33:46.000000000 +0100
+++ linux-2.6.18-mm2/drivers/ata/libata-core.c	2006-09-29 17:33:53.000000000 +0100
@@ -870,7 +870,11 @@
 		 * 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

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