Merge tag 'linux-can-fixes-for-4.17-20180510' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can

Marc Kleine-Budde says:

====================
this is a pull request for net/master consisting of 2 patches.

Both patches are from Lukas Wunner and fix two problems found in the
hi311x CAN driver under high load situations.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/can/spi/hi311x.c

@@ -91,6 +91,7 @@
 #define HI3110_STAT_BUSOFF BIT(2)
 #define HI3110_STAT_ERRP BIT(3)
 #define HI3110_STAT_ERRW BIT(4)
+#define HI3110_STAT_TXMTY BIT(7)
 
 #define HI3110_BTR0_SJW_SHIFT 6
 #define HI3110_BTR0_BRP_SHIFT 0
@@ -427,8 +428,10 @@ static int hi3110_get_berr_counter(const struct net_device *net,
 	struct hi3110_priv *priv = netdev_priv(net);
 	struct spi_device *spi = priv->spi;
 
+	mutex_lock(&priv->hi3110_lock);
 	bec->txerr = hi3110_read(spi, HI3110_READ_TEC);
 	bec->rxerr = hi3110_read(spi, HI3110_READ_REC);
+	mutex_unlock(&priv->hi3110_lock);
 
 	return 0;
 }
@@ -735,10 +738,7 @@ static irqreturn_t hi3110_can_ist(int irq, void *dev_id)
 			}
 		}
 
-		if (intf == 0)
-			break;
-
-		if (intf & HI3110_INT_TXCPLT) {
+		if (priv->tx_len && statf & HI3110_STAT_TXMTY) {
 			net->stats.tx_packets++;
 			net->stats.tx_bytes += priv->tx_len - 1;
 			can_led_event(net, CAN_LED_EVENT_TX);
@@ -748,6 +748,9 @@ static irqreturn_t hi3110_can_ist(int irq, void *dev_id)
 			}
 			netif_wake_queue(net);
 		}
+
+		if (intf == 0)
+			break;
 	}
 	mutex_unlock(&priv->hi3110_lock);
 	return IRQ_HANDLED;