1 files changed, 21 insertions, 11 deletions

diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 04a3f1b756a..5e10472371e 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -95,11 +95,16 @@ static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
 	spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
 }
 
+static int sja1000_is_absent(struct sja1000_priv *priv)
+{
+	return (priv->read_reg(priv, REG_MOD) == 0xFF);
+}
+
 static int sja1000_probe_chip(struct net_device *dev)
 {
 	struct sja1000_priv *priv = netdev_priv(dev);
 
-	if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) {
+	if (priv->reg_base && sja1000_is_absent(priv)) {
 		printk(KERN_INFO "%s: probing @0x%lX failed\n",
 		       DRV_NAME, dev->base_addr);
 		return 0;
@@ -128,7 +133,7 @@ static void set_reset_mode(struct net_device *dev)
 		status = priv->read_reg(priv, REG_MOD);
 	}
 
-	dev_err(dev->dev.parent, "setting SJA1000 into reset mode failed!\n");
+	netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
 }
 
 static void set_normal_mode(struct net_device *dev)
@@ -156,7 +161,7 @@ static void set_normal_mode(struct net_device *dev)
 		status = priv->read_reg(priv, REG_MOD);
 	}
 
-	dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n");
+	netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
 }
 
 static void sja1000_start(struct net_device *dev)
@@ -209,8 +214,7 @@ static int sja1000_set_bittiming(struct net_device *dev)
 	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 		btr1 |= 0x80;
 
-	dev_info(dev->dev.parent,
-		 "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
+	netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 
 	priv->write_reg(priv, REG_BTR0, btr0);
 	priv->write_reg(priv, REG_BTR1, btr1);
@@ -378,7 +382,7 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 
 	if (isrc & IRQ_DOI) {
 		/* data overrun interrupt */
-		dev_dbg(dev->dev.parent, "data overrun interrupt\n");
+		netdev_dbg(dev, "data overrun interrupt\n");
 		cf->can_id |= CAN_ERR_CRTL;
 		cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 		stats->rx_over_errors++;
@@ -388,7 +392,7 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 
 	if (isrc & IRQ_EI) {
 		/* error warning interrupt */
-		dev_dbg(dev->dev.parent, "error warning interrupt\n");
+		netdev_dbg(dev, "error warning interrupt\n");
 
 		if (status & SR_BS) {
 			state = CAN_STATE_BUS_OFF;
@@ -429,7 +433,7 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 	}
 	if (isrc & IRQ_EPI) {
 		/* error passive interrupt */
-		dev_dbg(dev->dev.parent, "error passive interrupt\n");
+		netdev_dbg(dev, "error passive interrupt\n");
 		if (status & SR_ES)
 			state = CAN_STATE_ERROR_PASSIVE;
 		else
@@ -437,7 +441,7 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 	}
 	if (isrc & IRQ_ALI) {
 		/* arbitration lost interrupt */
-		dev_dbg(dev->dev.parent, "arbitration lost interrupt\n");
+		netdev_dbg(dev, "arbitration lost interrupt\n");
 		alc = priv->read_reg(priv, REG_ALC);
 		priv->can.can_stats.arbitration_lost++;
 		stats->tx_errors++;
@@ -493,9 +497,12 @@ irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 	while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 		n++;
 		status = priv->read_reg(priv, REG_SR);
+		/* check for absent controller due to hw unplug */
+		if (status == 0xFF && sja1000_is_absent(priv))
+			return IRQ_NONE;
 
 		if (isrc & IRQ_WUI)
-			dev_warn(dev->dev.parent, "wakeup interrupt\n");
+			netdev_warn(dev, "wakeup interrupt\n");
 
 		if (isrc & IRQ_TI) {
 			/* transmission complete interrupt */
@@ -509,6 +516,9 @@ irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 			while (status & SR_RBS) {
 				sja1000_rx(dev);
 				status = priv->read_reg(priv, REG_SR);
+				/* check for absent controller */
+				if (status == 0xFF && sja1000_is_absent(priv))
+					return IRQ_NONE;
 			}
 		}
 		if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
@@ -522,7 +532,7 @@ irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 		priv->post_irq(priv);
 
 	if (n >= SJA1000_MAX_IRQ)
-		dev_dbg(dev->dev.parent, "%d messages handled in ISR", n);
+		netdev_dbg(dev, "%d messages handled in ISR", n);
 
 	return (n) ? IRQ_HANDLED : IRQ_NONE;
 }