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Date:   Tue, 12 Mar 2019 15:50:53 -0400
From:   Paul Thomas <pthomas8589@...il.com>
To:     netdev@...r.kernel.org
Cc:     Paul Thomas <pthomas8589@...il.com>
Subject: [PATCH] Check for SKBTX_HW_TSTAMP in macb driver

Make sure SKBTX_HW_TSTAMP (i.e. SOF_TIMESTAMPING_TX_HARDWARE) has been enabled for this skb
This is a concept for discussion, more testing is needed.
It does fix the issue where normal socks that aren't expecting a timestamp will not wake
up on select.
---
 drivers/net/ethernet/cadence/macb_main.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index ad099fd01b45..b2f184fc1370 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -898,11 +898,13 @@ 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) {
-					/* skb now belongs to timestamp buffer
-					 * and will be removed later
-					 */
-					tx_skb->skb = NULL;
+				if(unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
+					if (gem_ptp_do_txstamp(queue, skb, desc) == 0) {
+						/* skb now belongs to timestamp buffer
+						 * and will be removed later
+						 */
+						tx_skb->skb = NULL;
+					}
 				}
 				netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n",
 					    macb_tx_ring_wrap(bp, tail),
-- 
2.17.1

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