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authorLendacky, Thomas <Thomas.Lendacky@amd.com>2017-06-28 20:41:58 +0200
committerDavid S. Miller <davem@davemloft.net>2017-06-29 21:14:16 +0200
commit93845d5f1b3c3878fdeb6275f1928217ec0c9ff2 (patch)
tree8e9cb5c5201d5c29b4e1d7cd04cde838aec3d87a /drivers/net/ethernet/amd
parentamd-xgbe: Use the proper register during PTP initialization (diff)
downloadlinux-93845d5f1b3c3878fdeb6275f1928217ec0c9ff2.tar.xz
linux-93845d5f1b3c3878fdeb6275f1928217ec0c9ff2.zip
amd-xgbe: Add a check for an skb in the timestamp path
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>
Diffstat (limited to 'drivers/net/ethernet/amd')
-rw-r--r--drivers/net/ethernet/amd/xgbe/xgbe-drv.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
index a934bd5d0507..20685100ce12 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
@@ -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);
}