[PATCH net] sfc: move initialisation of efx->filter_sem to efx_init_struct()

[Edward Cree]

efx_probe_filters() has not been called yet when EF100 calls into
 efx_mcdi_filter_table_probe(), for which it wants to take the
 filter_sem.

Fixes: a9dc3d5612ce ("sfc_ef100: RX filter table management and related 
gubbins")
Signed-off-by: Edward Cree <ec...@solarflare.com>
---
 drivers/net/ethernet/sfc/efx_common.c | 1 +
 drivers/net/ethernet/sfc/rx_common.c  | 1 -
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/efx_common.c 
b/drivers/net/ethernet/sfc/efx_common.c
index 72a3f0e09f52..de797e1ac5a9 100644
--- a/drivers/net/ethernet/sfc/efx_common.c
+++ b/drivers/net/ethernet/sfc/efx_common.c
@@ -1014,6 +1014,7 @@ int efx_init_struct(struct efx_nic *efx,
        efx->num_mac_stats = MC_CMD_MAC_NSTATS;
        BUILD_BUG_ON(MC_CMD_MAC_NSTATS - 1 != MC_CMD_MAC_GENERATION_END);
        mutex_init(&efx->mac_lock);
+       init_rwsem(&efx->filter_sem);
 #ifdef CONFIG_RFS_ACCEL
        mutex_init(&efx->rps_mutex);
        spin_lock_init(&efx->rps_hash_lock);
diff --git a/drivers/net/ethernet/sfc/rx_common.c 
b/drivers/net/ethernet/sfc/rx_common.c
index 5e29284c89c9..19cf7cac1e6e 100644
--- a/drivers/net/ethernet/sfc/rx_common.c
+++ b/drivers/net/ethernet/sfc/rx_common.c
@@ -797,7 +797,6 @@ int efx_probe_filters(struct efx_nic *efx)
 {
        int rc;
 
-       init_rwsem(&efx->filter_sem);
        mutex_lock(&efx->mac_lock);
        down_write(&efx->filter_sem);
        rc = efx->type->filter_table_probe(efx);