1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 70b58fe9e5b1..be7726d7686d 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -622,6 +622,11 @@ 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);
 
+        /*
+         * The barrier is required to ensure that writes to cmd_block reach
+         * the memory before the write to PORT_CMD_ACTIVATE.
+         */
+        wmb();
         writel((u32)paddr, port + PORT_CMD_ACTIVATE);
         writel((u64)paddr >> 32, port + PORT_CMD_ACTIVATE + 4);
 
@@ -865,7 +870,7 @@ static void sil24_qc_prep(struct ata_queued_cmd *qc)
         } else {
                 prb = &cb->atapi.prb;
                 sge = cb->atapi.sge;
-                memset(cb->atapi.cdb, 0, 32);
+                memset(cb->atapi.cdb, 0, sizeof(cb->atapi.cdb));
                 memcpy(cb->atapi.cdb, qc->cdb, qc->dev->cdb_len);
 
                 if (ata_is_data(qc->tf.protocol)) {
@@ -895,6 +900,11 @@ 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;
 
+        /*
+         * The barrier is required to ensure that writes to cmd_block reach
+         * the memory before the write to PORT_CMD_ACTIVATE.
+         */
+        wmb();
         writel((u32)paddr, activate);
         writel((u64)paddr >> 32, activate + 4);