libata: hardreset on SERR_INTERNAL

There was a rare report where SB600 reported SERR_INTERNAL and SRST
couldn't get it out of the failure mode.  Hardreset on SERR_INTERNAL.
As the problem is intermittent, whether this fixes the problem or not
hasn't been verified yet, but hardresetting the channel on internal
error is a good idea anyway.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/ata/libata-eh.c

@@ -1056,7 +1056,7 @@ static void ata_eh_analyze_serror(struct ata_port *ap)
 	}
 	if (serror & SERR_INTERNAL) {
 		err_mask |= AC_ERR_SYSTEM;
-		action |= ATA_EH_SOFTRESET;
+		action |= ATA_EH_HARDRESET;
 	}
 	if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG))
 		ata_ehi_hotplugged(&ehc->i);