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net: dsa: initialize the routing table 

The routing table of every switch in a tree is currently initialized to
all zeros. This is an issue since 0 is a valid port number.

Add a DSA_RTABLE_NONE=-1 constant to initialize the signed values of the
routing table pointing to other switches.

This fixes the device mapping of the mv88e6xxx driver where the port
pointing to the switch itself and to non-existent switches was wrongly
configured to be 0. It is now set to the expected 0xf value.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot 2016-07-06 20:03:54 -04:00 committed by David S. Miller
parent 86dfb4acb3
commit d390238c4f
3 changed files with 14 additions and 1 deletions
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2
include/net/dsa.h
View File

@ -32,6 +32,8 @@ enum dsa_tag_protocol {
#define DSA_MAX_SWITCHES 4
#define DSA_MAX_PORTS 12
#define DSA_RTABLE_NONE -1
struct dsa_chip_data {
/*
* How to access the switch configuration registers.

6
net/dsa/dsa.c
View File

@ -774,11 +774,17 @@ static int dsa_of_probe(struct device *dev)
chip_index = -1;
for_each_available_child_of_node(np, child) {
int i;
chip_index++;
cd = &pd->chip[chip_index];
cd->of_node = child;
/* Initialize the routing table */
for (i = 0; i < DSA_MAX_SWITCHES; ++i)
cd->rtable[i] = DSA_RTABLE_NONE;
/* When assigning the host device, increment its refcount */
cd->host_dev = get_device(&mdio_bus->dev);

7
net/dsa/dsa2.c
View File

@ -595,7 +595,7 @@ static int _dsa_register_switch(struct dsa_switch *ds, struct device_node *np)
struct device_node *ports = dsa_get_ports(ds, np);
struct dsa_switch_tree *dst;
u32 tree, index;
int err;
int i, err;
err = dsa_parse_member(np, &tree, &index);
if (err)
@ -622,6 +622,11 @@ static int _dsa_register_switch(struct dsa_switch *ds, struct device_node *np)
ds->dst = dst;
ds->index = index;
/* Initialize the routing table */
for (i = 0; i < DSA_MAX_SWITCHES; ++i)
ds->rtable[i] = DSA_RTABLE_NONE;
dsa_dst_add_ds(dst, ds, index);
err = dsa_dst_complete(dst);