net: macb driver, check for SKBTX_HW_TSTAMP

Make sure SKBTX_HW_TSTAMP (i.e. SOF_TIMESTAMPING_TX_HARDWARE) has been
enabled for this skb. It does fix the issue where normal socks that
aren't expecting a timestamp will not wake up on select, but when a
user does want a SOF_TIMESTAMPING_TX_HARDWARE it does work.

Signed-off-by: Paul Thomas <pthomas8589@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 1522aee..3da2795 100644 (file)
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -898,7 +898,9 @@ static void macb_tx_interrupt(struct macb_queue *queue)
 
                        /* First, update TX stats if needed */
                        if (skb) {
-                               if (gem_ptp_do_txstamp(queue, skb, desc) == 0) {
+                               if (unlikely(skb_shinfo(skb)->tx_flags &
+                                            SKBTX_HW_TSTAMP) &&
+                                   gem_ptp_do_txstamp(queue, skb, desc) == 0) {
                                        /* skb now belongs to timestamp buffer
                                         * and will be removed later
                                         */