diff -rupN linux-2.6.25/drivers/ata/sata_promise.c linux-2.6.25.sata_promise-irqclear/drivers/ata/sata_promise.c
--- linux-2.6.25/drivers/ata/sata_promise.c	2008-04-17 18:22:32.000000000 +0200
+++ linux-2.6.25.sata_promise-irqclear/drivers/ata/sata_promise.c	2008-07-02 12:41:06.000000000 +0200
@@ -709,7 +709,7 @@ static void pdc_thaw(struct ata_port *ap
 	u32 tmp;
 
 	/* clear IRQ */
-	readl(mmio + PDC_INT_SEQMASK);
+	readl(mmio + PDC_COMMAND);
 
 	/* turn IRQ back on */
 	tmp = readl(mmio + PDC_CTLSTAT);
@@ -839,10 +839,9 @@ static inline unsigned int pdc_host_intr
 
 static void pdc_irq_clear(struct ata_port *ap)
 {
-	struct ata_host *host = ap->host;
-	void __iomem *mmio = host->iomap[PDC_MMIO_BAR];
+	void __iomem *mmio = ap->ioaddr.cmd_addr;
 
-	readl(mmio + PDC_INT_SEQMASK);
+	readl(mmio + PDC_COMMAND);
 }
 
 static irqreturn_t pdc_interrupt(int irq, void *dev_instance)