Author: np
Date: Sun Aug  6 19:45:59 2017
New Revision: 322123
URL: https://svnweb.freebsd.org/changeset/base/322123

Log:
  cxgbe(4): Avoid a NULL dereference that would occur during module unload
  if there were problems earlier during attach.
  
  MFC after:    3 days
  Sponsored by: Chelsio Communications

Modified:
  head/sys/dev/cxgbe/t4_sched.c

Modified: head/sys/dev/cxgbe/t4_sched.c
==============================================================================
--- head/sys/dev/cxgbe/t4_sched.c       Sun Aug  6 16:12:56 2017        
(r322122)
+++ head/sys/dev/cxgbe/t4_sched.c       Sun Aug  6 19:45:59 2017        
(r322123)
@@ -382,8 +382,10 @@ t4_free_tx_sched(struct adapter *sc)
 
        taskqueue_drain(taskqueue_thread, &sc->tc_task);
 
-       for_each_port(sc, i)
-           free(sc->port[i]->sched_params, M_CXGBE);
+       for_each_port(sc, i) {
+               if (sc->port[i] != NULL)
+                       free(sc->port[i]->sched_params, M_CXGBE);
+       }
 
        if (mtx_initialized(&sc->tc_lock))
                mtx_destroy(&sc->tc_lock);
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