diff options
| author |   Egil Hjelmeland <privat@egil-hjelmeland.no> | 2017-12-07 19:56:04 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-12-08 14:12:33 -0500 |
| commit | 2e8d243e887c8802b373338ddff684aa0578be3b (patch) | |
| tree | a954e778e154c3c6fe325cc51c54e4c5c8cd96c0 /drivers | |
| parent | net: sched: fix use-after-free in tcf_block_put_ext (diff) | |
| download | linux-dev-2e8d243e887c8802b373338ddff684aa0578be3b.tar.xz linux-dev-2e8d243e887c8802b373338ddff684aa0578be3b.zip | |
net: dsa: lan9303: Protect ALR operations with mutex
ALR table operations are a sequence of related register operations which
should be protected from concurrent access. The alr_cache should also be
protected. Add alr_mutex doing that.
Signed-off-by: Egil Hjelmeland <privat@egil-hjelmeland.no>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/dsa/lan9303-core.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c index ea59dadefb33..c1b004fa64d9 100644 --- a/drivers/net/dsa/lan9303-core.c +++ b/drivers/net/dsa/lan9303-core.c @@ -583,6 +583,7 @@ static void lan9303_alr_loop(struct lan9303 *chip, alr_loop_cb_t *cb, void *ctx) { int i; + mutex_lock(&chip->alr_mutex); lan9303_write_switch_reg(chip, LAN9303_SWE_ALR_CMD, LAN9303_ALR_CMD_GET_FIRST); lan9303_write_switch_reg(chip, LAN9303_SWE_ALR_CMD, 0); @@ -606,6 +607,7 @@ static void lan9303_alr_loop(struct lan9303 *chip, alr_loop_cb_t *cb, void *ctx) LAN9303_ALR_CMD_GET_NEXT); lan9303_write_switch_reg(chip, LAN9303_SWE_ALR_CMD, 0); } + mutex_unlock(&chip->alr_mutex); } static void alr_reg_to_mac(u32 dat0, u32 dat1, u8 mac[6]) @@ -694,16 +696,20 @@ static int lan9303_alr_add_port(struct lan9303 *chip, const u8 *mac, int port, { struct lan9303_alr_cache_entry *entr; + mutex_lock(&chip->alr_mutex); entr = lan9303_alr_cache_find_mac(chip, mac); if (!entr) { /*New entry */ entr = lan9303_alr_cache_find_free(chip); - if (!entr) + if (!entr) { + mutex_unlock(&chip->alr_mutex); return -ENOSPC; + } ether_addr_copy(entr->mac_addr, mac); } entr->port_map |= BIT(port); entr->stp_override = stp_override; lan9303_alr_set_entry(chip, mac, entr->port_map, stp_override); + mutex_unlock(&chip->alr_mutex); return 0; } @@ -713,15 +719,18 @@ static int lan9303_alr_del_port(struct lan9303 *chip, const u8 *mac, int port) { struct lan9303_alr_cache_entry *entr; + mutex_lock(&chip->alr_mutex); entr = lan9303_alr_cache_find_mac(chip, mac); if (!entr) - return 0; /* no static entry found */ + goto out; /* no static entry found */ entr->port_map &= ~BIT(port); if (entr->port_map == 0) /* zero means its free again */ eth_zero_addr(entr->mac_addr); lan9303_alr_set_entry(chip, mac, entr->port_map, entr->stp_override); +out: + mutex_unlock(&chip->alr_mutex); return 0; } @@ -1323,6 +1332,7 @@ int lan9303_probe(struct lan9303 *chip, struct device_node *np) int ret; mutex_init(&chip->indirect_mutex); + mutex_init(&chip->alr_mutex); lan9303_probe_reset_gpio(chip, np); |