diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index 824108cd9fd5..e29b6d051103 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -208,40 +208,31 @@ static int c_can_plat_probe(struct platform_device *pdev)
 	}
 
 	/* get the appropriate clk */
-	clk = clk_get(&pdev->dev, NULL);
+	clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(clk)) {
-		dev_err(&pdev->dev, "no clock defined\n");
-		ret = -ENODEV;
+		ret = PTR_ERR(clk);
 		goto exit;
 	}
 
 	/* get the platform data */
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	irq = platform_get_irq(pdev, 0);
-	if (!mem || irq <= 0) {
+	if (irq <= 0) {
 		ret = -ENODEV;
-		goto exit_free_clk;
+		goto exit;
 	}
 
-	if (!request_mem_region(mem->start, resource_size(mem),
-				KBUILD_MODNAME)) {
-		dev_err(&pdev->dev, "resource unavailable\n");
-		ret = -ENODEV;
-		goto exit_free_clk;
-	}
-
-	addr = ioremap(mem->start, resource_size(mem));
-	if (!addr) {
-		dev_err(&pdev->dev, "failed to map can port\n");
-		ret = -ENOMEM;
-		goto exit_release_mem;
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	addr = devm_ioremap_resource(&pdev->dev, mem);
+	if (IS_ERR(addr)) {
+		ret =  PTR_ERR(addr);
+		goto exit;
 	}
 
 	/* allocate the c_can device */
 	dev = alloc_c_can_dev();
 	if (!dev) {
 		ret = -ENOMEM;
-		goto exit_iounmap;
+		goto exit;
 	}
 
 	priv = netdev_priv(dev);
@@ -321,12 +312,6 @@ static int c_can_plat_probe(struct platform_device *pdev)
 
 exit_free_device:
 	free_c_can_dev(dev);
-exit_iounmap:
-	iounmap(addr);
-exit_release_mem:
-	release_mem_region(mem->start, resource_size(mem));
-exit_free_clk:
-	clk_put(clk);
 exit:
 	dev_err(&pdev->dev, "probe failed\n");
 
@@ -336,18 +321,10 @@ exit:
 static int c_can_plat_remove(struct platform_device *pdev)
 {
 	struct net_device *dev = platform_get_drvdata(pdev);
-	struct c_can_priv *priv = netdev_priv(dev);
-	struct resource *mem;
 
 	unregister_c_can_dev(dev);
 
 	free_c_can_dev(dev);
-	iounmap(priv->base);
-
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	release_mem_region(mem->start, resource_size(mem));
-
-	clk_put(priv->priv);
 
 	return 0;
 }
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index f31499a32d7d..d1692154ed1b 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -141,6 +141,7 @@ static void set_normal_mode(struct net_device *dev)
 {
 	struct sja1000_priv *priv = netdev_priv(dev);
 	unsigned char status = priv->read_reg(priv, SJA1000_MOD);
+	u8 mod_reg_val = 0x00;
 	int i;
 
 	for (i = 0; i < 100; i++) {
@@ -158,9 +159,10 @@ static void set_normal_mode(struct net_device *dev)
 
 		/* set chip to normal mode */
 		if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
-			priv->write_reg(priv, SJA1000_MOD, MOD_LOM);
-		else
-			priv->write_reg(priv, SJA1000_MOD, 0x00);
+			mod_reg_val |= MOD_LOM;
+		if (priv->can.ctrlmode & CAN_CTRLMODE_PRESUME_ACK)
+			mod_reg_val |= MOD_STM;
+		priv->write_reg(priv, SJA1000_MOD, mod_reg_val);
 
 		udelay(10);
 
@@ -278,6 +280,7 @@ static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 	uint8_t dlc;
 	canid_t id;
 	uint8_t dreg;
+	u8 cmd_reg_val = 0x00;
 	int i;
 
 	if (can_dropped_invalid_skb(dev, skb))
@@ -312,9 +315,14 @@ static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 	can_put_echo_skb(skb, dev, 0);
 
 	if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
-		sja1000_write_cmdreg(priv, CMD_TR | CMD_AT);
+		cmd_reg_val |= CMD_AT;
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
+		cmd_reg_val |= CMD_SRR;
 	else
-		sja1000_write_cmdreg(priv, CMD_TR);
+		cmd_reg_val |= CMD_TR;
+
+	sja1000_write_cmdreg(priv, cmd_reg_val);
 
 	return NETDEV_TX_OK;
 }
@@ -622,9 +630,12 @@ struct net_device *alloc_sja1000dev(int sizeof_priv)
 	priv->can.do_set_bittiming = sja1000_set_bittiming;
 	priv->can.do_set_mode = sja1000_set_mode;
 	priv->can.do_get_berr_counter = sja1000_get_berr_counter;
-	priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
-		CAN_CTRLMODE_BERR_REPORTING | CAN_CTRLMODE_LISTENONLY |
-		CAN_CTRLMODE_ONE_SHOT;
+	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
+				       CAN_CTRLMODE_LISTENONLY |
+				       CAN_CTRLMODE_3_SAMPLES |
+				       CAN_CTRLMODE_ONE_SHOT |
+				       CAN_CTRLMODE_BERR_REPORTING |
+				       CAN_CTRLMODE_PRESUME_ACK;
 
 	spin_lock_init(&priv->cmdreg_lock);
 
diff --git a/include/uapi/linux/can/netlink.h b/include/uapi/linux/can/netlink.h
index 813d11f54977..3e4323a3918d 100644
--- a/include/uapi/linux/can/netlink.h
+++ b/include/uapi/linux/can/netlink.h
@@ -92,11 +92,12 @@ struct can_ctrlmode {
 };
 
 #define CAN_CTRLMODE_LOOPBACK		0x01	/* Loopback mode */
-#define CAN_CTRLMODE_LISTENONLY		0x02 	/* Listen-only mode */
+#define CAN_CTRLMODE_LISTENONLY		0x02	/* Listen-only mode */
 #define CAN_CTRLMODE_3_SAMPLES		0x04	/* Triple sampling mode */
 #define CAN_CTRLMODE_ONE_SHOT		0x08	/* One-Shot mode */
 #define CAN_CTRLMODE_BERR_REPORTING	0x10	/* Bus-error reporting */
 #define CAN_CTRLMODE_FD			0x20	/* CAN FD mode */
+#define CAN_CTRLMODE_PRESUME_ACK	0x40	/* Ignore missing CAN ACKs */
 
 /*
  * CAN device statistics