Merge tag 'linux-can-fixes-for-4.15-20171208' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can

Marc Kleine-Budde says:

====================
pull-request: can 2017-12-08

this is a pull request of 6 patches for net/master.

Martin Kelly provides 5 patches for various USB based CAN drivers, that
properly cancel the URBs on adapter unplug, so that the driver doesn't
end up in an endless loop. Stephane Grosjean provides a patch to restart
the tx queue if zero length packages are transmitted.
====================

Signed-off-by: David S. Miller <[e-mail]>

drivers/net/can/peak_canfd/peak_canfd.c

···
 	/* if this frame is an echo, */
 	if ((rx_msg_flags & PUCAN_MSG_LOOPED_BACK) &&
 	    !(rx_msg_flags & PUCAN_MSG_SELF_RECEIVE)) {
-		int n;
 		unsigned long flags;
 
 		spin_lock_irqsave(&priv->echo_lock, flags);
-		n = can_get_echo_skb(priv->ndev, msg->client);
+		can_get_echo_skb(priv->ndev, msg->client);
 		spin_unlock_irqrestore(&priv->echo_lock, flags);
 
 		/* count bytes of the echo instead of skb */
 		stats->tx_bytes += cf_len;
 		stats->tx_packets++;
 
-		if (n) {
-			/* restart tx queue only if a slot is free */
-			netif_wake_queue(priv->ndev);
-		}
+		/* restart tx queue (a slot is free) */
+		netif_wake_queue(priv->ndev);
 
 		return 0;
 	}

drivers/net/can/usb/ems_usb.c

···
 
 	case -ECONNRESET: /* unlink */
 	case -ENOENT:
+	case -EPIPE:
+	case -EPROTO:
 	case -ESHUTDOWN:
 		return;
 

drivers/net/can/usb/esd_usb2.c

···
 		break;
 
 	case -ENOENT:
+	case -EPIPE:
+	case -EPROTO:
 	case -ESHUTDOWN:
 		return;
 

drivers/net/can/usb/kvaser_usb.c

···
 	case 0:
 		break;
 	case -ENOENT:
+	case -EPIPE:
+	case -EPROTO:
 	case -ESHUTDOWN:
 		return;
 	default:

drivers/net/can/usb/mcba_usb.c

···
 
 	case -ENOENT:
 	case -EPIPE:
+	case -EPROTO:
 	case -ESHUTDOWN:
 		return;
 

drivers/net/can/usb/usb_8dev.c

···
 		break;
 
 	case -ENOENT:
+	case -EPIPE:
+	case -EPROTO:
 	case -ESHUTDOWN:
 		return;