netdev - [PATCH] v2 Check for SKBTX_HW

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Message-Id: <20190319170449.24980-1-pthomas8589@gmail.com>
Date:   Tue, 19 Mar 2019 13:04:49 -0400
From:   Paul Thomas <pthomas8589@...il.com>
To:     netdev@...r.kernel.org
Cc:     Paul Thomas <pthomas8589@...il.com>
Subject: [PATCH] v2 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 It does fix the issue where normal socks that
aren't expecting a timestamp will not wake up on select. And when a
user does want a SOF_TIMESTAMPING_TX_HARDWARE this does work.

Signed-off-by: Paul Thomas <pthomas8589@...il.com>
---
 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