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ice: add lock around Tx timestamp tracker flush

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The driver didn't take the lock while flushing the Tx tracker, which
could cause a race where one thread is trying to read timestamps out
while another thread is trying to read the tracker to check the
timestamps.

Avoid this by ensuring that flushing is locked against read accesses.

Fixes: ea9b847cda ("ice: enable transmit timestamps for E810 devices")
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Jacob Keller 2021-08-23 17:01:48 -07:00 committed by Tony Nguyen
parent 1f0cbb3e89
commit 4dd0d5c33c
1 changed files with 4 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/net/ethernet/intel/ice/ice_ptp.c
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@ -1267,6 +1267,8 @@ ice_ptp_flush_tx_tracker(struct ice_pf *pf, struct ice_ptp_tx *tx)
{
u8 idx;
spin_lock(&tx->lock);
for (idx = 0; idx < tx->len; idx++) {
u8 phy_idx = idx + tx->quad_offset;
@ -1279,6 +1281,8 @@ ice_ptp_flush_tx_tracker(struct ice_pf *pf, struct ice_ptp_tx *tx)
tx->tstamps[idx].skb = NULL;
}
}
spin_unlock(&tx->lock);
}
/**