Author: andrew
Date: Sat Oct 15 09:54:22 2016
New Revision: 307349
URL: https://svnweb.freebsd.org/changeset/base/307349

Log:
  Check we are in a critical section when calling vfp_discard. As we may call
  it with a NULL thread pointer only check when it is non-NULL.
  
  Obtained from:        ABT Systems Ltd
  Sponsored by: The FreeBSD Foundation

Modified:
  head/sys/arm64/arm64/vfp.c

Modified: head/sys/arm64/arm64/vfp.c
==============================================================================
--- head/sys/arm64/arm64/vfp.c  Sat Oct 15 09:10:35 2016        (r307348)
+++ head/sys/arm64/arm64/vfp.c  Sat Oct 15 09:54:22 2016        (r307349)
@@ -79,6 +79,10 @@ void
 vfp_discard(struct thread *td)
 {
 
+#ifdef INVARIANTS
+       if (td != NULL)
+               CRITICAL_ASSERT(td);
+#endif
        if (PCPU_GET(fpcurthread) == td)
                PCPU_SET(fpcurthread, NULL);
 
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