netdev - [net-next 14/14] igb: Free any held skb that should have been timestamped on remove

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Date:	Thu, 17 Jan 2013 03:35:19 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Matthew Vick <matthew.vick@...el.com>, netdev@...r.kernel.org,
	gospo@...hat.com, sassmann@...hat.com,
	Richard Cochran <richardcochran@...il.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 14/14] igb: Free any held skb that should have been timestamped on remove

From: Matthew Vick <matthew.vick@...el.com>

To prevent a race condition where an skb has been saved to return the Tx
timestamp later and the driver is removed, add a check to determine if we
have an skb stored and, if so, free it.

Cc: Richard Cochran <richardcochran@...il.com>
Signed-off-by: Matthew Vick <matthew.vick@...el.com>
Acked-by: Jacob Keller <Jacob.e.keller@...el.com>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/igb/igb_ptp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index 5545abc..0987822 100644
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -856,6 +856,10 @@ void igb_ptp_stop(struct igb_adapter *adapter)
 	}
 
 	cancel_work_sync(&adapter->ptp_tx_work);
+	if (adapter->ptp_tx_skb) {
+		dev_kfree_skb_any(adapter->ptp_tx_skb);
+		adapter->ptp_tx_skb = NULL;
+	}
 
 	if (adapter->ptp_clock) {
 		ptp_clock_unregister(adapter->ptp_clock);
-- 
1.7.11.7

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