diff options
author | Martin Habets <mhabets@solarflare.com> | 2016-06-15 17:48:49 +0100 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2016-06-15 22:26:26 -0700 |
commit | d248953a3ccd218893b5119a0e63058f0dabca67 (patch) | |
tree | 149c4b4bfb07deb8d13e524e3ba3949e709a95c6 /drivers/net/ethernet | |
parent | 4a53ea8a74248adfb3179c4ede3d741a5dd9ef5a (diff) | |
download | linux-d248953a3ccd218893b5119a0e63058f0dabca67.tar.bz2 |
sfc: Take mac_lock before calling efx_ef10_filter_table_probe
When trying to enslave an SFC interface to a bond the following BUG_ON was
hit:
kernel BUG [in ef10.c]!
CPU: 0 PID: 4383 Comm: ifenslave Tainted: G
...
Call Trace:
efx_ef10_filter_add_vlan+0x121/0x180 [sfc]
efx_ef10_filter_table_probe+0x2a2/0x4f0 [sfc]
efx_ef10_set_mac_address+0x370/0x6d0 [sfc]
efx_set_mac_address+0x7d/0x120 [sfc]
dev_set_mac_address+0x43/0xa0
bond_enslave+0x337/0xea0 [bonding]
This comes from function efx_ef10_filter_vlan_sync_rx_mode.
To solve the bug we ensure the mac_lock is taken before calling
efx_ef10_filter_add_vlan. But to avoid a priority inversion mac_lock must
be taken before filter_sem.
To satisfy these requirements we end up taking mac_lock in
efx_ef10_vport_set_mac_address, efx_ef10_set_mac_address,
efx_ef10_sriov_set_vf_vlan and efx_probe_filters.
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet')
-rw-r--r-- | drivers/net/ethernet/sfc/ef10.c | 4 | ||||
-rw-r--r-- | drivers/net/ethernet/sfc/ef10_sriov.c | 7 | ||||
-rw-r--r-- | drivers/net/ethernet/sfc/efx.c | 2 |
3 files changed, 11 insertions, 2 deletions
diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c index a3c00ffae8a0..add9f46542fc 100644 --- a/drivers/net/ethernet/sfc/ef10.c +++ b/drivers/net/ethernet/sfc/ef10.c @@ -4666,6 +4666,8 @@ static int efx_ef10_set_mac_address(struct efx_nic *efx) efx_device_detach_sync(efx); efx_net_stop(efx->net_dev); + + mutex_lock(&efx->mac_lock); down_write(&efx->filter_sem); efx_ef10_filter_table_remove(efx); @@ -4678,6 +4680,8 @@ static int efx_ef10_set_mac_address(struct efx_nic *efx) efx_ef10_filter_table_probe(efx); up_write(&efx->filter_sem); + mutex_unlock(&efx->mac_lock); + if (was_enabled) efx_net_open(efx->net_dev); netif_device_attach(efx->net_dev); diff --git a/drivers/net/ethernet/sfc/ef10_sriov.c b/drivers/net/ethernet/sfc/ef10_sriov.c index 3c17f274e802..a76610ae9fb4 100644 --- a/drivers/net/ethernet/sfc/ef10_sriov.c +++ b/drivers/net/ethernet/sfc/ef10_sriov.c @@ -554,6 +554,7 @@ int efx_ef10_sriov_set_vf_vlan(struct efx_nic *efx, int vf_i, u16 vlan, efx_device_detach_sync(vf->efx); efx_net_stop(vf->efx->net_dev); + mutex_lock(&vf->efx->mac_lock); down_write(&vf->efx->filter_sem); vf->efx->type->filter_table_remove(vf->efx); @@ -630,6 +631,7 @@ restore_filters: goto reset_nic_up_write; up_write(&vf->efx->filter_sem); + mutex_unlock(&vf->efx->mac_lock); up_write(&vf->efx->filter_sem); @@ -642,9 +644,10 @@ restore_filters: return rc; reset_nic_up_write: - if (vf->efx) + if (vf->efx) { up_write(&vf->efx->filter_sem); - + mutex_unlock(&vf->efx->mac_lock); + } reset_nic: if (vf->efx) { netif_err(efx, drv, efx->net_dev, diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index 902bcf292b09..130ee176cd4f 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -1729,6 +1729,7 @@ static int efx_probe_filters(struct efx_nic *efx) spin_lock_init(&efx->filter_lock); init_rwsem(&efx->filter_sem); + mutex_lock(&efx->mac_lock); down_write(&efx->filter_sem); rc = efx->type->filter_table_probe(efx); if (rc) @@ -1767,6 +1768,7 @@ static int efx_probe_filters(struct efx_nic *efx) #endif out_unlock: up_write(&efx->filter_sem); + mutex_unlock(&efx->mac_lock); return rc; } |