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Commit a61e5406 authored by Andrew Lunn's avatar Andrew Lunn Committed by David S. Miller
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net: dsa: mv88e6xxx: Release mutex between each ATU read 



The PTP code needs low latency access to the PTP hardware timestamps.
Reading all the ATU entries in one go adds a lot of latency to the PTP
code. So take and release the reg_lock mutex for each individual MAC
address in the ATU, allowing the PTP thread jump in between.

Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 377cda13

drivers/net/dsa/mv88e6xxx/chip.c

+8 −6
Original line number Diff line number Diff line
@@ -1437,7 +1437,9 @@ static int mv88e6xxx_port_db_dump_fid(struct mv88e6xxx_chip *chip, 
	eth_broadcast_addr(addr.mac);



	do {

		mutex_lock(&chip->reg_lock);

		err = mv88e6xxx_g1_atu_getnext(chip, fid, &addr);

		mutex_unlock(&chip->reg_lock);

		if (err)

			return err;
@@ -1470,7 +1472,10 @@ static int mv88e6xxx_port_db_dump(struct mv88e6xxx_chip *chip, int port, 
	int err;



	/* Dump port's default Filtering Information Database (VLAN ID 0) */

	mutex_lock(&chip->reg_lock);

	err = mv88e6xxx_port_get_fid(chip, port, &fid);

	mutex_unlock(&chip->reg_lock);



	if (err)

		return err;
@@ -1480,7 +1485,9 @@ static int mv88e6xxx_port_db_dump(struct mv88e6xxx_chip *chip, int port, 


	/* Dump VLANs' Filtering Information Databases */

	do {

		mutex_lock(&chip->reg_lock);

		err = mv88e6xxx_vtu_getnext(chip, &vlan);

		mutex_unlock(&chip->reg_lock);

		if (err)

			return err;
@@ -1500,13 +1507,8 @@ static int mv88e6xxx_port_fdb_dump(struct dsa_switch *ds, int port, 
				   dsa_fdb_dump_cb_t *cb, void *data)

{

	struct mv88e6xxx_chip *chip = ds->priv;

	int err;



	mutex_lock(&chip->reg_lock);

	err = mv88e6xxx_port_db_dump(chip, port, cb, data);

	mutex_unlock(&chip->reg_lock);



	return err;

	return mv88e6xxx_port_db_dump(chip, port, cb, data);

}



static int mv88e6xxx_bridge_map(struct mv88e6xxx_chip *chip,