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net: mscc: ocelot: fix race between ndo_get_stats64 and ocelot_check_stats_work

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[ Upstream commit 18d8e67df184081bc6ce6220a2dd965cfd3d7e6b ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vladimir Oltean 2022-08-16 16:53:49 +03:00 committed by Greg Kroah-Hartman
parent 0d05a55803
commit 3aa635bf2f
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/mscc/ocelot_net.c
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@ -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[],