[PATCH] net: mvpp2: free pending TX timestamp skbs when the port is stopped

[PATCH] net: mvpp2: free pending TX timestamp skbs when the port is stopped

[Wentao Liang]

mvpp2_tx_hw_tstamp() takes an extra reference on skbs that need a TX
timestamp and stores them in port->tx_hwtstamp_queue[]. The reference is
dropped by mvpp2_isr_handle_ptp_queue() when the hardware reports the
timestamp. Nothing drains the queues when the port is stopped, so skbs
still waiting for a timestamp keep their reference until their queue
slot is reused, and are leaked for good when the port is removed.

Free the queued skbs in mvpp2_stop(), after the interrupts have been
released.

Fixes: f5015a594c50 ("net: mvpp2: ptp: add support for transmit timestamping")
Cc: stable@vger.kernel.org
Assisted-by: DeepSeek-V4.1-Flash and OpenAI Codex
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 317af54369cf..fc020b8c8830 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -3419,6 +3419,22 @@ static void mvpp2_isr_handle_ptp(struct mvpp2_port *port)
 		mvpp2_isr_handle_ptp_queue(port, 1);
 }
 
+static void mvpp2_tx_hwtstamp_flush(struct mvpp2_port *port)
+{
+	struct mvpp2_hwtstamp_queue *queue;
+	int nq, i;
+
+	for (nq = 0; nq < ARRAY_SIZE(port->tx_hwtstamp_queue); nq++) {
+		queue = &port->tx_hwtstamp_queue[nq];
+		for (i = 0; i < ARRAY_SIZE(queue->skb); i++) {
+			if (!queue->skb[i])
+				continue;
+			dev_kfree_skb_any(queue->skb[i]);
+			queue->skb[i] = NULL;
+		}
+	}
+}
+
 static void mvpp2_isr_handle_link(struct mvpp2_port *port,
 				  struct phylink_pcs *pcs, bool link)
 {
@@ -4914,6 +4930,7 @@ static int mvpp2_stop(struct net_device *dev)
 		free_irq(port->port_irq, port);
 
 	mvpp2_irqs_deinit(port);
+	mvpp2_tx_hwtstamp_flush(port);
 	if (!port->has_tx_irqs) {
 		for (thread = 0; thread < port->priv->nthreads; thread++) {
 			port_pcpu = per_cpu_ptr(port->pcpu, thread);
-- 
2.34.1

Re: [PATCH] net: mvpp2: free pending TX timestamp skbs when the port is stopped

[netdev-bot+sinfo]

Hi!

This is an automated message. This series looks like a fix, but its
commit messages seem to be missing some information:

 - How the issue was discovered, e.g. hit in production, hit during
   development, syzbot report, manual code inspection, LLM or static
   analysis tool scan.

 - Whether the issue was actually triggered, or is only theoretical
   (e.g. found by code inspection). If it was triggered please include
   the symptoms, like the stack trace or error messages.

 - What hardware the change was tested on. For driver fixes please
   mention the device (and if relevant firmware version) used for
   testing, or say that the change was not tested on real hardware.

Please do not repost the series just to address the above. Instead,
reply to this email with the missing information, so that reviewers
can take it into account. If the series needs another revision for
other reasons, please include the information in the commit messages
then.

The evaluation is done by an LLM so it may be wrong, if you think
that is the case please reply and explain.

Re: [PATCH] net: mvpp2: free pending TX timestamp skbs when the port is stopped

[Krzysztof Kozlowski]

On Tue, 03 Nov 2026 10:05:35 +0000, Wentao Liang wrote:
> mvpp2_tx_hw_tstamp() takes an extra reference on skbs that need a TX
> timestamp and stores them in port->tx_hwtstamp_queue[]. The reference is
> dropped by mvpp2_isr_handle_ptp_queue() when the hardware reports the
> timestamp. Nothing drains the queues when the port is stopped, so skbs
> still waiting for a timestamp keep their reference until their queue
> slot is reused, and are leaked for good when the port is removed.
> 
> Free the queued skbs in mvpp2_stop(), after the interrupts have been
> released.
> 
> Fixes: f5015a594c50 ("net: mvpp2: ptp: add support for transmit timestamping")
> Cc: stable@vger.kernel.org
> Assisted-by: DeepSeek-V4.1-Flash and OpenAI Codex
> Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
> ---
>  drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 



Multiple things here:
1. Your team ignored completely previous feedback. Multiple times.

2. You use multiple identities with this email address, thus I doubt that we
   speak with an actual person.

3. Your bot does not even bother running checkpatch, right?

4. Nothing of this was reproduced nor tested.

5. Finally, the same feedback:
You sent multiple independent patches, to multiple independent
subsystems. The amount of these patches clearly suggest this was
AI generated and most likely not tested.

More importantly, you sent all this work without properly organizing
relevant patches into patchsets. This makes reviewing difficult
and might cause multiple reviewers to address the same issue.
Replying to the entire set is impossible and requires handling each
patch independently, instead of applying or discarding the set.
Maintainers also won't see the bigger picture of your work. Quite
worrying.

This is on the verge of hostile patch: bomb us with so many
contributions, we won't be able to handle them in efficient manner,
like responding ONCE to ask you to slow down.  Considering all this
is untested and LLM generated, I have even more doubts whether this
should be considered for review.

Please read kernel documentation BEFORE posting more work. It will
explain you how to identify subsystems, how to organize your work per
subsystem (so a patchset grouping multiple patches with a short cover
letter), how to document the issue discovery method and what was
or was not tested.

Best regards,
Krzysztof