diff options
| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2022-08-16 16:53:49 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-08-17 21:58:32 -0700 |
| commit | 18d8e67df184081bc6ce6220a2dd965cfd3d7e6b (patch) | |
| tree | a83f952a61fd4eb584e245b02eaa6002b9836bd9 /drivers/net/ethernet/mscc/ocelot_net.c | |
| parent | 22d842e3efe56402c33b5e6e303bb71ce9bf9334 (diff) | |
net: mscc: ocelot: fix race between ndo_get_stats64 and ocelot_check_stats_work
The 2 methods can run concurrently, and one will change the window of
counters (SYS_STAT_CFG_STAT_VIEW) that the other sees. The fix is
similar to what commit 7fbf6795d127 ("net: mscc: ocelot: fix mutex lock
error during ethtool stats read") has done for ethtool -S.
Fixes: a556c76adc05 ("net: mscc: Add initial Ocelot switch support")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/mscc/ocelot_net.c')
| -rw-r--r-- | drivers/net/ethernet/mscc/ocelot_net.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c index 9d8cea16245e..6b9d37138844 100644 --- a/drivers/net/ethernet/mscc/ocelot_net.c +++ b/drivers/net/ethernet/mscc/ocelot_net.c @@ -726,6 +726,8 @@ static void ocelot_get_stats64(struct net_device *dev, struct ocelot *ocelot = priv->port.ocelot; int port = priv->port.index; + spin_lock(&ocelot->stats_lock); + /* Configure the port to read the stats from */ ocelot_write(ocelot, SYS_STAT_CFG_STAT_VIEW(port), SYS_STAT_CFG); @@ -758,6 +760,8 @@ static void ocelot_get_stats64(struct net_device *dev, stats->tx_dropped = ocelot_read(ocelot, SYS_COUNT_TX_DROPS) + ocelot_read(ocelot, SYS_COUNT_TX_AGING); stats->collisions = ocelot_read(ocelot, SYS_COUNT_TX_COLLISION); + + spin_unlock(&ocelot->stats_lock); } static int ocelot_port_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], |