vfio: Ignore sprurious notifies

Remove debugging WARN_ON if we get a spurious notify for a group that
no longer exists.  No reports of anyone hitting this, but it would
likely be a race and not a bug if they did.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 6d18c3cafdd4..842f4507883e 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -510,13 +510,11 @@ static int vfio_iommu_group_notifier(struct notifier_block *nb,
         struct device *dev = data;
 
         /*
-         * Need to go through a group_lock lookup to get a reference or
-         * we risk racing a group being removed.  Leave a WARN_ON for
-         * debuging, but if the group no longer exists, a spurious notify
-         * is harmless.
+         * Need to go through a group_lock lookup to get a reference or we
+         * risk racing a group being removed.  Ignore spurious notifies.
          */
         group = vfio_group_try_get(group);
-        if (WARN_ON(!group))
+        if (!group)
                 return NOTIFY_OK;
 
         switch (action) {