netdev - [PATCH net-next 09/11] idpf: prevent deinit uninitialized virtchnl core

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Message-ID: <20240304210514.3412298-10-anthony.l.nguyen@intel.com>
Date: Mon,  4 Mar 2024 13:05:09 -0800
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	netdev@...r.kernel.org
Cc: Alan Brady <alan.brady@...el.com>,
	anthony.l.nguyen@...el.com,
	Alexander Lobakin <aleksander.lobakin@...el.com>,
	Krishneil Singh <krishneil.k.singh@...el.com>
Subject: [PATCH net-next 09/11] idpf: prevent deinit uninitialized virtchnl core

From: Alan Brady <alan.brady@...el.com>

In idpf_remove we need to tear down the virtchnl core with
idpf_vc_core_deinit so we can free up resources and leave things in a
good state. However, in the case where we failed to establish VC
communications we may not have ever actually successfully initialized
the virtchnl core.

This fixes it by setting a bit once we successfully init the virtchnl
core.  Then, in deinit, we'll check for it before going on further,
otherwise we just return. Also clear the bit at the end of deinit so we
know it's gone now.

Tested-by: Alexander Lobakin <aleksander.lobakin@...el.com>
Signed-off-by: Alan Brady <alan.brady@...el.com>
Tested-by: Krishneil Singh <krishneil.k.singh@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/idpf/idpf.h          |  2 ++
 drivers/net/ethernet/intel/idpf/idpf_virtchnl.c | 10 ++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/idpf/idpf.h b/drivers/net/ethernet/intel/idpf/idpf.h
index 5ed08be1dbc0..e7a036538246 100644
--- a/drivers/net/ethernet/intel/idpf/idpf.h
+++ b/drivers/net/ethernet/intel/idpf/idpf.h
@@ -83,6 +83,7 @@ enum idpf_state {
  * @IDPF_HR_RESET_IN_PROG: Reset in progress
  * @IDPF_REMOVE_IN_PROG: Driver remove in progress
  * @IDPF_MB_INTR_MODE: Mailbox in interrupt mode
+ * @IDPF_VC_CORE_INIT: virtchnl core has been init
  * @IDPF_FLAGS_NBITS: Must be last
  */
 enum idpf_flags {
@@ -91,6 +92,7 @@ enum idpf_flags {
 	IDPF_HR_RESET_IN_PROG,
 	IDPF_REMOVE_IN_PROG,
 	IDPF_MB_INTR_MODE,
+	IDPF_VC_CORE_INIT,
 	IDPF_FLAGS_NBITS,
 };
 
diff --git a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
index e89e2bad460d..a602ff8d74e0 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
@@ -2990,7 +2990,9 @@ int idpf_vc_core_init(struct idpf_adapter *adapter)
 	queue_delayed_work(adapter->init_wq, &adapter->init_task,
 			   msecs_to_jiffies(5 * (adapter->pdev->devfn & 0x07)));
 
-	goto no_err;
+	set_bit(IDPF_VC_CORE_INIT, adapter->flags);
+
+	return 0;
 
 err_intr_req:
 	cancel_delayed_work_sync(&adapter->serv_task);
@@ -2999,7 +3001,6 @@ int idpf_vc_core_init(struct idpf_adapter *adapter)
 err_netdev_alloc:
 	kfree(adapter->vports);
 	adapter->vports = NULL;
-no_err:
 	return err;
 
 init_failed:
@@ -3034,6 +3035,9 @@ int idpf_vc_core_init(struct idpf_adapter *adapter)
  */
 void idpf_vc_core_deinit(struct idpf_adapter *adapter)
 {
+	if (!test_bit(IDPF_VC_CORE_INIT, adapter->flags))
+		return;
+
 	idpf_vc_xn_shutdown(adapter->vcxn_mngr);
 	idpf_deinit_task(adapter);
 	idpf_intr_rel(adapter);
@@ -3045,6 +3049,8 @@ void idpf_vc_core_deinit(struct idpf_adapter *adapter)
 
 	kfree(adapter->vports);
 	adapter->vports = NULL;
+
+	clear_bit(IDPF_VC_CORE_INIT, adapter->flags);
 }
 
 /**
-- 
2.41.0