i40evf: add comment

Add a comment to reduce confusion.

Change-ID: I3d5819c0f3f5174680442ae54398a073d4a61f4f
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index 5673dbd2cf7db9a7629e7c95d4a73cba5a0073a7..f35dcaac5bb7bd9bf86412c1bb40f8e971d086c7 100644 (file)
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -2153,6 +2153,11 @@ static int i40evf_close(struct net_device *netdev)
        adapter->state = __I40EVF_DOWN_PENDING;
        i40evf_free_traffic_irqs(adapter);
 
+       /* We explicitly don't free resources here because the hardware is
+        * still active and can DMA into memory. Resources are cleared in
+        * i40evf_virtchnl_completion() after we get confirmation from the PF
+        * driver that the rings have been stopped.
+        */
        return 0;
 }