ionic: disable napi when ionic_lif_init() fails

When the driver is going through reset, it will eventually call
ionic_lif_init(), which does a lot of re-initialization. One
of the re-initialization steps is to setup the adminq and
enable napi for it.  If something breaks after this point
we can end up with a kernel NULL pointer dereference through
ionic_adminq_napi.

Fix this by making sure to call napi_disable() in the cleanup
path of ionic_lif_init().  This forces any pending napi contexts
to finish and prevents them from being recalled before deleting
the napi context.

Fixes: 77ceb68e29 ("ionic: Add notifyq support")
Signed-off-by: Brett Creeley <brett@pensando.io>
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/ionic_lif.c

@@ -3266,6 +3266,7 @@ int ionic_lif_init(struct ionic_lif *lif)
 	return 0;
 
 err_out_notifyq_deinit:
+	napi_disable(&lif->adminqcq->napi);
 	ionic_lif_qcq_deinit(lif, lif->notifyqcq);
 err_out_adminq_deinit:
 	ionic_lif_qcq_deinit(lif, lif->adminqcq);