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>
Orabug: 26132523
(cherry picked from commit 51f38262669b88b6f5ec52cb93dc72c58d85dc1f)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>
Reviewed-by: Brian Maly <brian.maly@oracle.com>

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index 2937cc95097b15f6722b03f7169de27111bdb196..d39674232e4184d85c9af5b2f14ac5cf5731196e 100644 (file)
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -2155,6 +2155,11 @@ 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;
 }