can: peak_usb: fix hwtstamp assignment

The skb->tstamp is set to the hardware timestamp when available in the USB
urb message. This leads to user visible timestamps which contain the 'uptime'
of the USB adapter - and not the usual system generated timestamp.

Fix this wrong assignment by applying the available hardware timestamp to the
skb_shared_hwtstamps data structure - which is intended for this purpose.

Cc: linux-stable <[e-mail]>
Signed-off-by: Oliver Hartkopp <[e-mail]>
Signed-off-by: Marc Kleine-Budde <[e-mail]>

drivers/net/can/usb/peak_usb/pcan_usb.c

···
 	mc->pdev->dev.can.state = new_state;
 
 	if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) {
+		struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
+
 		peak_usb_get_ts_tv(&mc->pdev->time_ref, mc->ts16, &tv);
-		skb->tstamp = timeval_to_ktime(tv);
+		hwts->hwtstamp = timeval_to_ktime(tv);
 	}
 
 	netif_rx(skb);
···
 	struct sk_buff *skb;
 	struct can_frame *cf;
 	struct timeval tv;
+	struct skb_shared_hwtstamps *hwts;
 
 	skb = alloc_can_skb(mc->netdev, &cf);
 	if (!skb)
···
 
 	/* convert timestamp into kernel time */
 	peak_usb_get_ts_tv(&mc->pdev->time_ref, mc->ts16, &tv);
-	skb->tstamp = timeval_to_ktime(tv);
+	hwts = skb_hwtstamps(skb);
+	hwts->hwtstamp = timeval_to_ktime(tv);
 
 	/* push the skb */
 	netif_rx(skb);

drivers/net/can/usb/peak_usb/pcan_usb_pro.c

···
 	struct can_frame *can_frame;
 	struct sk_buff *skb;
 	struct timeval tv;
+	struct skb_shared_hwtstamps *hwts;
 
 	skb = alloc_can_skb(netdev, &can_frame);
 	if (!skb)
···
 		memcpy(can_frame->data, rx->data, can_frame->can_dlc);
 
 	peak_usb_get_ts_tv(&usb_if->time_ref, le32_to_cpu(rx->ts32), &tv);
-	skb->tstamp = timeval_to_ktime(tv);
+	hwts = skb_hwtstamps(skb);
+	hwts->hwtstamp = timeval_to_ktime(tv);
 
 	netif_rx(skb);
 	netdev->stats.rx_packets++;
···
 	u8 err_mask = 0;
 	struct sk_buff *skb;
 	struct timeval tv;
+	struct skb_shared_hwtstamps *hwts;
 
 	/* nothing should be sent while in BUS_OFF state */
 	if (dev->can.state == CAN_STATE_BUS_OFF)
···
 	dev->can.state = new_state;
 
 	peak_usb_get_ts_tv(&usb_if->time_ref, le32_to_cpu(er->ts32), &tv);
-	skb->tstamp = timeval_to_ktime(tv);
+	hwts = skb_hwtstamps(skb);
+	hwts->hwtstamp = timeval_to_ktime(tv);
 	netif_rx(skb);
 	netdev->stats.rx_packets++;
 	netdev->stats.rx_bytes += can_frame->can_dlc;