diff options
| author | Horatiu Vultur <horatiu.vultur@microchip.com> | 2022-07-14 21:40:37 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-07-18 19:59:59 -0700 |
| commit | 43243bb3195b0dc27741679471e23baed1efe98e (patch) | |
| tree | 054d03018a15cee763c0689372fdd6ae008e78c3 | |
| parent | 45533a534a45cb12c20c81615d17306176cb1c57 (diff) | |
| download | linux-43243bb3195b0dc27741679471e23baed1efe98e.tar.gz | |
net: lan966x: Fix usage of lan966x->mac_lock when entry is added
To add an entry to the MAC table, it is required first to setup the
entry and then issue a command for the MAC to learn the entry.
So if it happens for two threads to add simultaneously an entry in MAC
table then it would be a race condition.
Fix this by using lan966x->mac_lock to protect the HW access.
Fixes: fc0c3fe7486f2 ("net: lan966x: Add function lan966x_mac_ip_learn()")
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | drivers/net/ethernet/microchip/lan966x/lan966x_mac.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c index 2d2b83c03796de..4f8fd5cde9506f 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c @@ -75,6 +75,9 @@ static int __lan966x_mac_learn(struct lan966x *lan966x, int pgid, unsigned int vid, enum macaccess_entry_type type) { + int ret; + + spin_lock(&lan966x->mac_lock); lan966x_mac_select(lan966x, mac, vid); /* Issue a write command */ @@ -86,7 +89,10 @@ static int __lan966x_mac_learn(struct lan966x *lan966x, int pgid, ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_LEARN), lan966x, ANA_MACACCESS); - return lan966x_mac_wait_for_completion(lan966x); + ret = lan966x_mac_wait_for_completion(lan966x); + spin_unlock(&lan966x->mac_lock); + + return ret; } /* The mask of the front ports is encoded inside the mac parameter via a call |