i40iw: Protect req_resource_num update

commit 44856be3e95c87f03e850ef4fdf8c0503c2dde18 upstream.

In i40iw_alloc_resource(), ensure that the update to
req_resource_num is protected by the lock.

Fixes: 8e06af711bf2 ("i40iw: add main, hdr, status")
Reported-by: Stefan Assmann <sassmann@redhat.com>
Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/infiniband/hw/i40iw/i40iw.h b/drivers/infiniband/hw/i40iw/i40iw.h
index b738acdb9b027705f11257c8ab25cbaeba652159..44e1e0b495667ba665a5a57ed11da1856e1e41f2 100644 (file)
--- a/drivers/infiniband/hw/i40iw/i40iw.h
+++ b/drivers/infiniband/hw/i40iw/i40iw.h
@@ -435,8 +435,8 @@ static inline int i40iw_alloc_resource(struct i40iw_device *iwdev,
        *next = resource_num + 1;
        if (*next == max_resources)
                *next = 0;
-       spin_unlock_irqrestore(&iwdev->resource_lock, flags);
        *req_resource_num = resource_num;
+       spin_unlock_irqrestore(&iwdev->resource_lock, flags);
 
        return 0;
 }