From: Vladimir Oltean vladimir.oltean@nxp.com
[ Upstream commit 49753a75b9a32de4c0393bb8d1e51ea223fda8e4 ]
Looking at the code, the GSWIP switch appears to hold bridging service structures (VLANs, FDBs, forwarding rules) in PCE table entries. Hardware access to the PCE table is non-atomic, and is comprised of several register reads and writes.
These accesses are currently serialized by the rtnl_lock, but DSA is changing its driver API and that lock will no longer be held when calling ->port_fdb_add() and ->port_fdb_del().
So this driver needs to serialize the access to the PCE table using its own locking scheme. This patch adds that.
Signed-off-by: Vladimir Oltean vladimir.oltean@nxp.com Reviewed-by: Florian Fainelli f.fainelli@gmail.com Acked-by: Hauke Mehrtens hauke@hauke-m.de Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/dsa/lantiq_gswip.c | 28 +++++++++++++++++++++++----- 1 file changed, 23 insertions(+), 5 deletions(-)
diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c index dbd4486a173ff..1a96df70d1e85 100644 --- a/drivers/net/dsa/lantiq_gswip.c +++ b/drivers/net/dsa/lantiq_gswip.c @@ -276,6 +276,7 @@ struct gswip_priv { int num_gphy_fw; struct gswip_gphy_fw *gphy_fw; u32 port_vlan_filter; + struct mutex pce_table_lock; };
struct gswip_pce_table_entry { @@ -523,10 +524,14 @@ static int gswip_pce_table_entry_read(struct gswip_priv *priv, u16 addr_mode = tbl->key_mode ? GSWIP_PCE_TBL_CTRL_OPMOD_KSRD : GSWIP_PCE_TBL_CTRL_OPMOD_ADRD;
+ mutex_lock(&priv->pce_table_lock); + err = gswip_switch_r_timeout(priv, GSWIP_PCE_TBL_CTRL, GSWIP_PCE_TBL_CTRL_BAS); - if (err) + if (err) { + mutex_unlock(&priv->pce_table_lock); return err; + }
gswip_switch_w(priv, tbl->index, GSWIP_PCE_TBL_ADDR); gswip_switch_mask(priv, GSWIP_PCE_TBL_CTRL_ADDR_MASK | @@ -536,8 +541,10 @@ static int gswip_pce_table_entry_read(struct gswip_priv *priv,
err = gswip_switch_r_timeout(priv, GSWIP_PCE_TBL_CTRL, GSWIP_PCE_TBL_CTRL_BAS); - if (err) + if (err) { + mutex_unlock(&priv->pce_table_lock); return err; + }
for (i = 0; i < ARRAY_SIZE(tbl->key); i++) tbl->key[i] = gswip_switch_r(priv, GSWIP_PCE_TBL_KEY(i)); @@ -553,6 +560,8 @@ static int gswip_pce_table_entry_read(struct gswip_priv *priv, tbl->valid = !!(crtl & GSWIP_PCE_TBL_CTRL_VLD); tbl->gmap = (crtl & GSWIP_PCE_TBL_CTRL_GMAP_MASK) >> 7;
+ mutex_unlock(&priv->pce_table_lock); + return 0; }
@@ -565,10 +574,14 @@ static int gswip_pce_table_entry_write(struct gswip_priv *priv, u16 addr_mode = tbl->key_mode ? GSWIP_PCE_TBL_CTRL_OPMOD_KSWR : GSWIP_PCE_TBL_CTRL_OPMOD_ADWR;
+ mutex_lock(&priv->pce_table_lock); + err = gswip_switch_r_timeout(priv, GSWIP_PCE_TBL_CTRL, GSWIP_PCE_TBL_CTRL_BAS); - if (err) + if (err) { + mutex_unlock(&priv->pce_table_lock); return err; + }
gswip_switch_w(priv, tbl->index, GSWIP_PCE_TBL_ADDR); gswip_switch_mask(priv, GSWIP_PCE_TBL_CTRL_ADDR_MASK | @@ -600,8 +613,12 @@ static int gswip_pce_table_entry_write(struct gswip_priv *priv, crtl |= GSWIP_PCE_TBL_CTRL_BAS; gswip_switch_w(priv, crtl, GSWIP_PCE_TBL_CTRL);
- return gswip_switch_r_timeout(priv, GSWIP_PCE_TBL_CTRL, - GSWIP_PCE_TBL_CTRL_BAS); + err = gswip_switch_r_timeout(priv, GSWIP_PCE_TBL_CTRL, + GSWIP_PCE_TBL_CTRL_BAS); + + mutex_unlock(&priv->pce_table_lock); + + return err; }
/* Add the LAN port into a bridge with the CPU port by @@ -2106,6 +2123,7 @@ static int gswip_probe(struct platform_device *pdev) priv->ds->priv = priv; priv->ds->ops = priv->hw_info->ops; priv->dev = dev; + mutex_init(&priv->pce_table_lock); version = gswip_switch_r(priv, GSWIP_VERSION);
np = dev->of_node;