4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mustafa Ismail <[email protected]>

commit faa739fb5df56aadab96bcd2f6eb3486cc3a3aec upstream.

In i40iw_open(), check if interface is already open
and return success if it is.

Fixes: 8e06af711bf2 ("i40iw: add main, hdr, status")

Reported-by: Stefan Assmann <[email protected]>
Signed-off-by: Mustafa Ismail <[email protected]>
Signed-off-by: Shiraz Saleem <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 drivers/infiniband/hw/i40iw/i40iw_main.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/infiniband/hw/i40iw/i40iw_main.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_main.c
@@ -1558,6 +1558,10 @@ static int i40iw_open(struct i40e_info *
        enum i40iw_status_code status;
        struct i40iw_handler *hdl;
 
+       hdl = i40iw_find_netdev(ldev->netdev);
+       if (hdl)
+               return 0;
+
        hdl = kzalloc(sizeof(*hdl), GFP_KERNEL);
        if (!hdl)
                return -ENOMEM;


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