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 <pthomas8...@gmail.com>
---
 Fix subject and patch formatting from v2

 drivers/net/ethernet/cadence/macb_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c 
b/drivers/net/ethernet/cadence/macb_main.c
index ad099fd01b45..48fc45ab514f 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -898,7 +898,8 @@ 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
                                         */
-- 
2.17.1

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