1 files changed, 6 insertions, 20 deletions

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 1984a6e89e84..81e772a94d59 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -324,6 +324,7 @@ static ssize_t ahci_store_em_buffer(struct device *dev,
 	struct ahci_host_priv *hpriv = ap->host->private_data;
 	void __iomem *mmio = hpriv->mmio;
 	void __iomem *em_mmio = mmio + hpriv->em_loc;
+	const unsigned char *msg_buf = buf;
 	u32 em_ctl, msg;
 	unsigned long flags;
 	int i;
@@ -343,8 +344,8 @@ static ssize_t ahci_store_em_buffer(struct device *dev,
 	}
 
 	for (i = 0; i < size; i += 4) {
-		msg = buf[i] | buf[i + 1] << 8 |
-		      buf[i + 2] << 16 | buf[i + 3] << 24;
+		msg = msg_buf[i] | msg_buf[i + 1] << 8 |
+		      msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24;
 		writel(msg, em_mmio + i);
 	}
 
@@ -541,29 +542,11 @@ static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
 	return -EINVAL;
 }
 
-static int ahci_is_device_present(void __iomem *port_mmio)
-{
-	u8 status = readl(port_mmio + PORT_TFDATA) & 0xff;
-
-	/* Make sure PxTFD.STS.BSY and PxTFD.STS.DRQ are 0 */
-	if (status & (ATA_BUSY | ATA_DRQ))
-		return 0;
-
-	/* Make sure PxSSTS.DET is 3h */
-	status = readl(port_mmio + PORT_SCR_STAT) & 0xf;
-	if (status != 3)
-		return 0;
-	return 1;
-}
-
 void ahci_start_engine(struct ata_port *ap)
 {
 	void __iomem *port_mmio = ahci_port_base(ap);
 	u32 tmp;
 
-	if (!ahci_is_device_present(port_mmio))
-		return;
-
 	/* start DMA */
 	tmp = readl(port_mmio + PORT_CMD);
 	tmp |= PORT_CMD_START;
@@ -1892,6 +1875,9 @@ static void ahci_error_handler(struct ata_port *ap)
 	}
 
 	sata_pmp_error_handler(ap);
+
+	if (!ata_dev_enabled(ap->link.device))
+		ahci_stop_engine(ap);
 }
 
 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)