[net-next 02/15] i40e: Fix a bug where a client close can be called before an open is complete

[Jeff Kirsher]

From: Anjali Singhai Jain <anjali.sing...@intel.com>

The client->open call in this path was not protected with the
client instance mutex, and hence the client->close can get initiated
before the open completes.

Change-Id: I0ed60c38868dd3f44966b6ed49a063d0e5b7edf5
Signed-off-by: Anjali Singhai Jain <anjali.sing...@intel.com>
Tested-by: Andrew Bowers <andrewx.bow...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_client.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_client.c 
b/drivers/net/ethernet/intel/i40e/i40e_client.c
index e6b9263..8726269 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_client.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_client.c
@@ -541,6 +541,7 @@ void i40e_client_subtask(struct i40e_pf *pf)
                         client->name, pf->hw.pf_id,
                         pf->hw.bus.device, pf->hw.bus.func);
 
+               mutex_lock(&i40e_client_instance_mutex);
                /* Send an Open request to the client */
                atomic_inc(&cdev->ref_cnt);
                if (client->ops && client->ops->open)
@@ -554,6 +555,7 @@ void i40e_client_subtask(struct i40e_pf *pf)
                        atomic_dec(&client->ref_cnt);
                        continue;
                }
+               mutex_unlock(&i40e_client_instance_mutex);
        }
        mutex_unlock(&i40e_client_mutex);
 }
-- 
2.7.4