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amd-xgbe: Add a check for an skb in the timestamp path

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Spurious Tx timestamp interrupts can cause an oops in the Tx timestamp
processing function if a Tx timestamp skb is NULL. Add a check to insure
a Tx timestamp skb is present before attempting to use it.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lendacky, Thomas 2017-06-28 13:41:58 -05:00 committed by David S. Miller
parent 3abc7cff67
commit 93845d5f1b
1 changed files with 6 additions and 1 deletions
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7
drivers/net/ethernet/amd/xgbe/xgbe-drv.c
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@ -1212,6 +1212,10 @@ static void xgbe_tx_tstamp(struct work_struct *work)
u64 nsec;
unsigned long flags;
spin_lock_irqsave(&pdata->tstamp_lock, flags);
if (!pdata->tx_tstamp_skb)
goto unlock;
if (pdata->tx_tstamp) {
nsec = timecounter_cyc2time(&pdata->tstamp_tc,
pdata->tx_tstamp);
@ -1223,8 +1227,9 @@ static void xgbe_tx_tstamp(struct work_struct *work)
dev_kfree_skb_any(pdata->tx_tstamp_skb);
spin_lock_irqsave(&pdata->tstamp_lock, flags);
pdata->tx_tstamp_skb = NULL;
unlock:
spin_unlock_irqrestore(&pdata->tstamp_lock, flags);
}