diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c
index 57dadd52b428a536d71f2364c006641e5e765083..1deb8ff90a89528e147b42353500d1610ff4a285 100644
--- a/drivers/net/can/bfin_can.c
+++ b/drivers/net/can/bfin_can.c
@@ -501,8 +501,6 @@ static int bfin_can_err(struct net_device *dev, u16 isrc, u16 status)
 			cf->data[2] |= CAN_ERR_PROT_FORM;
 		else if (status & SER)
 			cf->data[2] |= CAN_ERR_PROT_STUFF;
-		else
-			cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 	}
 
 	priv->can.state = state;
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 5d214d1353320856cf3de91d837b910df3f3de24..f91b094288dad3d86064f24a33a97ad58756f3ca 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -962,7 +962,6 @@ static int c_can_handle_bus_err(struct net_device *dev,
 	 * type of the last error to occur on the CAN bus
 	 */
 	cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
-	cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 
 	switch (lec_type) {
 	case LEC_STUFF_ERROR:
@@ -975,8 +974,7 @@ static int c_can_handle_bus_err(struct net_device *dev,
 		break;
 	case LEC_ACK_ERROR:
 		netdev_dbg(dev, "ack error\n");
-		cf->data[3] |= (CAN_ERR_PROT_LOC_ACK |
-				CAN_ERR_PROT_LOC_ACK_DEL);
+		cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 		break;
 	case LEC_BIT1_ERROR:
 		netdev_dbg(dev, "bit1 error\n");
@@ -988,8 +986,7 @@ static int c_can_handle_bus_err(struct net_device *dev,
 		break;
 	case LEC_CRC_ERROR:
 		netdev_dbg(dev, "CRC error\n");
-		cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
-				CAN_ERR_PROT_LOC_CRC_DEL);
+		cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 		break;
 	default:
 		break;
diff --git a/drivers/net/can/cc770/cc770.c b/drivers/net/can/cc770/cc770.c
index 70a8cbb29e75844a02bea49a937bf0c05a200910..1e37313054f3950ee30e6c6fccad874d9262013a 100644
--- a/drivers/net/can/cc770/cc770.c
+++ b/drivers/net/can/cc770/cc770.c
@@ -578,7 +578,7 @@ static int cc770_err(struct net_device *dev, u8 status)
 				cf->data[2] |= CAN_ERR_PROT_BIT0;
 				break;
 			case STAT_LEC_CRC:
-				cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ;
+				cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 				break;
 			}
 		}
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 868fe945e35a39786bf15fb8b142c36a720179a5..41c0fc9f3b1465d9dbbde6b5c7798b1e40cf43ef 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -535,13 +535,13 @@ static void do_bus_err(struct net_device *dev,
 	if (reg_esr & FLEXCAN_ESR_ACK_ERR) {
 		netdev_dbg(dev, "ACK_ERR irq\n");
 		cf->can_id |= CAN_ERR_ACK;
-		cf->data[3] |= CAN_ERR_PROT_LOC_ACK;
+		cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 		tx_errors = 1;
 	}
 	if (reg_esr & FLEXCAN_ESR_CRC_ERR) {
 		netdev_dbg(dev, "CRC_ERR irq\n");
 		cf->data[2] |= CAN_ERR_PROT_BIT;
-		cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ;
+		cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 		rx_errors = 1;
 	}
 	if (reg_esr & FLEXCAN_ESR_FRM_ERR) {
diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index c1e85368a198bd898f853c5842c58fbb3b01b04b..5d04f5464faf29a8b1c99dcc8bae86becbd1c485 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -1096,7 +1096,6 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 			cf->data[2] |= CAN_ERR_PROT_STUFF;
 			break;
 		default:
-			cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 			cf->data[3] = ecc & ECC_SEG;
 			break;
 		}
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index ef655177bb5e5b62a7be1f821d08a88226ba7b84..39cf911f7a1e3c364d7818bdc6bcd162a6490951 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -487,7 +487,6 @@ static int m_can_handle_lec_err(struct net_device *dev,
 	 * type of the last error to occur on the CAN bus
 	 */
 	cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
-	cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 
 	switch (lec_type) {
 	case LEC_STUFF_ERROR:
@@ -500,8 +499,7 @@ static int m_can_handle_lec_err(struct net_device *dev,
 		break;
 	case LEC_ACK_ERROR:
 		netdev_dbg(dev, "ack error\n");
-		cf->data[3] |= (CAN_ERR_PROT_LOC_ACK |
-				CAN_ERR_PROT_LOC_ACK_DEL);
+		cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 		break;
 	case LEC_BIT1_ERROR:
 		netdev_dbg(dev, "bit1 error\n");
@@ -513,8 +511,7 @@ static int m_can_handle_lec_err(struct net_device *dev,
 		break;
 	case LEC_CRC_ERROR:
 		netdev_dbg(dev, "CRC error\n");
-		cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
-				CAN_ERR_PROT_LOC_CRC_DEL);
+		cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 		break;
 	default:
 		break;
diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
index e187ca783da0946def7585ff8d85ac76ea201e05..c1317889d3d8d97858604feeb63fa4f7cec8a368 100644
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -559,8 +559,7 @@ static void pch_can_error(struct net_device *ndev, u32 status)
 		stats->rx_errors++;
 		break;
 	case PCH_CRC_ERR:
-		cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ |
-			       CAN_ERR_PROT_LOC_CRC_DEL;
+		cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 		priv->can.can_stats.bus_error++;
 		stats->rx_errors++;
 		break;
diff --git a/drivers/net/can/rcar_can.c b/drivers/net/can/rcar_can.c
index 7bd54191f962a4ad3079eabdcefb0d001a14bf0b..bc46be39549d2ab317862ba376ccb063be65b7be 100644
--- a/drivers/net/can/rcar_can.c
+++ b/drivers/net/can/rcar_can.c
@@ -241,17 +241,16 @@ static void rcar_can_error(struct net_device *ndev)
 		u8 ecsr;
 
 		netdev_dbg(priv->ndev, "Bus error interrupt:\n");
-		if (skb) {
+		if (skb)
 			cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
-			cf->data[2] = CAN_ERR_PROT_UNSPEC;
-		}
+
 		ecsr = readb(&priv->regs->ecsr);
 		if (ecsr & RCAR_CAN_ECSR_ADEF) {
 			netdev_dbg(priv->ndev, "ACK Delimiter Error\n");
 			tx_errors++;
 			writeb(~RCAR_CAN_ECSR_ADEF, &priv->regs->ecsr);
 			if (skb)
-				cf->data[3] |= CAN_ERR_PROT_LOC_ACK_DEL;
+				cf->data[3] = CAN_ERR_PROT_LOC_ACK_DEL;
 		}
 		if (ecsr & RCAR_CAN_ECSR_BE0F) {
 			netdev_dbg(priv->ndev, "Bit Error (dominant)\n");
@@ -272,7 +271,7 @@ static void rcar_can_error(struct net_device *ndev)
 			rx_errors++;
 			writeb(~RCAR_CAN_ECSR_CEF, &priv->regs->ecsr);
 			if (skb)
-				cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ;
+				cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 		}
 		if (ecsr & RCAR_CAN_ECSR_AEF) {
 			netdev_dbg(priv->ndev, "ACK Error\n");
@@ -280,7 +279,7 @@ static void rcar_can_error(struct net_device *ndev)
 			writeb(~RCAR_CAN_ECSR_AEF, &priv->regs->ecsr);
 			if (skb) {
 				cf->can_id |= CAN_ERR_ACK;
-				cf->data[3] |= CAN_ERR_PROT_LOC_ACK;
+				cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 			}
 		}
 		if (ecsr & RCAR_CAN_ECSR_FEF) {
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 7b92e911a6168badb3e30f8fc55b2e6fdd0f61dc..8dda3b703d39a1e82ce7fc6a63707e883d235313 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -218,6 +218,9 @@ static void sja1000_start(struct net_device *dev)
 	priv->write_reg(priv, SJA1000_RXERR, 0x0);
 	priv->read_reg(priv, SJA1000_ECC);
 
+	/* clear interrupt flags */
+	priv->read_reg(priv, SJA1000_IR);
+
 	/* leave reset mode */
 	set_normal_mode(dev);
 }
@@ -446,7 +449,6 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 			cf->data[2] |= CAN_ERR_PROT_STUFF;
 			break;
 		default:
-			cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 			cf->data[3] = ecc & ECC_SEG;
 			break;
 		}
diff --git a/drivers/net/can/sun4i_can.c b/drivers/net/can/sun4i_can.c
index d9a42c6467836cdf3aa00adc1d5a4f059b97469e..68ef0a4cd82153cd65699ab0a4d80a5a201393e6 100644
--- a/drivers/net/can/sun4i_can.c
+++ b/drivers/net/can/sun4i_can.c
@@ -575,7 +575,6 @@ static int sun4i_can_err(struct net_device *dev, u8 isrc, u8 status)
 				cf->data[2] |= CAN_ERR_PROT_STUFF;
 				break;
 			default:
-				cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 				cf->data[3] = (ecc & SUN4I_STA_ERR_SEG_CODE)
 					       >> 16;
 				break;
diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
index cf345cbfe8198ef23ee328fc2eb67f5841751ee1..680d1ff07a55ddd60ceb09eb42bb98faaa42ad9f 100644
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@@ -722,7 +722,6 @@ static int ti_hecc_error(struct net_device *ndev, int int_status,
 	if (err_status & HECC_BUS_ERROR) {
 		++priv->can.can_stats.bus_error;
 		cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
-		cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 		if (err_status & HECC_CANES_FE) {
 			hecc_set_bit(priv, HECC_CANES, HECC_CANES_FE);
 			cf->data[2] |= CAN_ERR_PROT_FORM;
@@ -737,13 +736,11 @@ static int ti_hecc_error(struct net_device *ndev, int int_status,
 		}
 		if (err_status & HECC_CANES_CRCE) {
 			hecc_set_bit(priv, HECC_CANES, HECC_CANES_CRCE);
-			cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ |
-					CAN_ERR_PROT_LOC_CRC_DEL;
+			cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 		}
 		if (err_status & HECC_CANES_ACKE) {
 			hecc_set_bit(priv, HECC_CANES, HECC_CANES_ACKE);
-			cf->data[3] |= CAN_ERR_PROT_LOC_ACK |
-					CAN_ERR_PROT_LOC_ACK_DEL;
+			cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 		}
 	}
 
diff --git a/drivers/net/can/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c
index 2d390384ef3bb3d3845fcf6102bef70715f1dd21..fc5b75675cd8b6dbebbbc79d357001676900fefa 100644
--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -377,7 +377,6 @@ static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
 			cf->data[2] |= CAN_ERR_PROT_STUFF;
 			break;
 		default:
-			cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 			cf->data[3] = ecc & SJA1000_ECC_SEG;
 			break;
 		}
diff --git a/drivers/net/can/usb/esd_usb2.c b/drivers/net/can/usb/esd_usb2.c
index 0e5a4493ba4fee6d3c4fb5626a676f18802a6ef3..113e64fcd73be9a16635f0029ed3c6d0c2a17306 100644
--- a/drivers/net/can/usb/esd_usb2.c
+++ b/drivers/net/can/usb/esd_usb2.c
@@ -282,7 +282,6 @@ static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv,
 				cf->data[2] |= CAN_ERR_PROT_STUFF;
 				break;
 			default:
-				cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 				cf->data[3] = ecc & SJA1000_ECC_SEG;
 				break;
 			}
diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
index 8b17a9065b0b193a0c5e5a93048c637f0f7fbad3..022bfa13ebfa0c85491cfc2cb17a3437c01f0205 100644
--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -944,10 +944,9 @@ static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
 			cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
 
 			if (es->leaf.error_factor & M16C_EF_ACKE)
-				cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
+				cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 			if (es->leaf.error_factor & M16C_EF_CRCE)
-				cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
-						CAN_ERR_PROT_LOC_CRC_DEL);
+				cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 			if (es->leaf.error_factor & M16C_EF_FORME)
 				cf->data[2] |= CAN_ERR_PROT_FORM;
 			if (es->leaf.error_factor & M16C_EF_STFE)
diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
index de95b1ccba3e3b6d4d00e313acb280cd178a000d..a731720f1d132501d12d6241ccee833ae2e61787 100644
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -401,9 +401,7 @@ static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv,
 		tx_errors = 1;
 		break;
 	case USB_8DEV_STATUSMSG_CRC:
-		cf->data[2] |= CAN_ERR_PROT_UNSPEC;
-		cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ |
-			       CAN_ERR_PROT_LOC_CRC_DEL;
+		cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 		rx_errors = 1;
 		break;
 	case USB_8DEV_STATUSMSG_BIT0:
diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
index fc55e8e0351dfe5f3ca436d8aed64bf6d660db84..51670b322409b6606736751dae23433e1d165500 100644
--- a/drivers/net/can/xilinx_can.c
+++ b/drivers/net/can/xilinx_can.c
@@ -608,17 +608,15 @@ static void xcan_err_interrupt(struct net_device *ndev, u32 isr)
 
 	/* Check for error interrupt */
 	if (isr & XCAN_IXR_ERROR_MASK) {
-		if (skb) {
+		if (skb)
 			cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
-			cf->data[2] |= CAN_ERR_PROT_UNSPEC;
-		}
 
 		/* Check for Ack error interrupt */
 		if (err_status & XCAN_ESR_ACKER_MASK) {
 			stats->tx_errors++;
 			if (skb) {
 				cf->can_id |= CAN_ERR_ACK;
-				cf->data[3] |= CAN_ERR_PROT_LOC_ACK;
+				cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 			}
 		}
 
@@ -654,8 +652,7 @@ static void xcan_err_interrupt(struct net_device *ndev, u32 isr)
 			stats->rx_errors++;
 			if (skb) {
 				cf->can_id |= CAN_ERR_PROT;
-				cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ |
-						CAN_ERR_PROT_LOC_CRC_DEL;
+				cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 			}
 		}
 			priv->can.can_stats.bus_error++;