diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index e925051..6392fdb 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -622,6 +622,7 @@ static int sil24_exec_polled_cmd(struct ata_port *ap, int pmp,
 	irq_enabled = readl(port + PORT_IRQ_ENABLE_SET);
 	writel(PORT_IRQ_COMPLETE | PORT_IRQ_ERROR, port + PORT_IRQ_ENABLE_CLR);
 
+	wmb();
 	writel((u32)paddr, port + PORT_CMD_ACTIVATE);
 	writel((u64)paddr >> 32, port + PORT_CMD_ACTIVATE + 4);
 
@@ -895,6 +896,7 @@ static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc)
 	paddr = pp->cmd_block_dma + tag * sizeof(*pp->cmd_block);
 	activate = port + PORT_CMD_ACTIVATE + tag * 8;
 
+	wmb();
 	writel((u32)paddr, activate);
 	writel((u64)paddr >> 32, activate + 4);