netdev - [PATCH v2 net-next 09/16] sfc: factor out efx_mcdi_filter_table_down() from

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Date:   Thu, 2 Jul 2020 17:30:39 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     <linux-net-drivers@...arflare.com>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next 09/16] sfc: factor out
 efx_mcdi_filter_table_down() from _remove()

_down() merely removes all our filters and VLANs, it doesn't free
 efx->filter_state itself.

Signed-off-by: Edward Cree <ecree@...arflare.com>
---
 drivers/net/ethernet/sfc/mcdi_filters.c | 37 ++++++++++++++++---------
 drivers/net/ethernet/sfc/mcdi_filters.h |  1 +
 2 files changed, 25 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/sfc/mcdi_filters.c b/drivers/net/ethernet/sfc/mcdi_filters.c
index 74ee06fe0996..283f68264b66 100644
--- a/drivers/net/ethernet/sfc/mcdi_filters.c
+++ b/drivers/net/ethernet/sfc/mcdi_filters.c
@@ -1459,7 +1459,7 @@ void efx_mcdi_filter_table_restore(struct efx_nic *efx)
 		table->must_restore_filters = false;
 }
 
-void efx_mcdi_filter_table_remove(struct efx_nic *efx)
+void efx_mcdi_filter_table_down(struct efx_nic *efx)
 {
 	struct efx_mcdi_filter_table *table = efx->filter_state;
 	MCDI_DECLARE_BUF(inbuf, MC_CMD_FILTER_OP_EXT_IN_LEN);
@@ -1467,21 +1467,11 @@ void efx_mcdi_filter_table_remove(struct efx_nic *efx)
 	unsigned int filter_idx;
 	int rc;
 
-	efx_mcdi_filter_cleanup_vlans(efx);
-	efx->filter_state = NULL;
-	/*
-	 * If we were called without locking, then it's not safe to free
-	 * the table as others might be using it.  So we just WARN, leak
-	 * the memory, and potentially get an inconsistent filter table
-	 * state.
-	 * This should never actually happen.
-	 */
-	if (!efx_rwsem_assert_write_locked(&efx->filter_sem))
-		return;
-
 	if (!table)
 		return;
 
+	efx_mcdi_filter_cleanup_vlans(efx);
+
 	for (filter_idx = 0; filter_idx < EFX_MCDI_FILTER_TBL_ROWS; filter_idx++) {
 		spec = efx_mcdi_filter_entry_spec(table, filter_idx);
 		if (!spec)
@@ -1501,6 +1491,27 @@ void efx_mcdi_filter_table_remove(struct efx_nic *efx)
 				   __func__, filter_idx);
 		kfree(spec);
 	}
+}
+
+void efx_mcdi_filter_table_remove(struct efx_nic *efx)
+{
+	struct efx_mcdi_filter_table *table = efx->filter_state;
+
+	efx_mcdi_filter_table_down(efx);
+
+	efx->filter_state = NULL;
+	/*
+	 * If we were called without locking, then it's not safe to free
+	 * the table as others might be using it.  So we just WARN, leak
+	 * the memory, and potentially get an inconsistent filter table
+	 * state.
+	 * This should never actually happen.
+	 */
+	if (!efx_rwsem_assert_write_locked(&efx->filter_sem))
+		return;
+
+	if (!table)
+		return;
 
 	vfree(table->entry);
 	kfree(table);
diff --git a/drivers/net/ethernet/sfc/mcdi_filters.h b/drivers/net/ethernet/sfc/mcdi_filters.h
index 03a8bf74c733..23f9d08d071d 100644
--- a/drivers/net/ethernet/sfc/mcdi_filters.h
+++ b/drivers/net/ethernet/sfc/mcdi_filters.h
@@ -93,6 +93,7 @@ struct efx_mcdi_filter_table {
 };
 
 int efx_mcdi_filter_table_probe(struct efx_nic *efx, bool multicast_chaining);
+void efx_mcdi_filter_table_down(struct efx_nic *efx);
 void efx_mcdi_filter_table_remove(struct efx_nic *efx);
 void efx_mcdi_filter_table_restore(struct efx_nic *efx);