D57841.diff
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	diff --git a/sys/dev/tpm/tpm_tis_core.c b/sys/dev/tpm/tpm_tis_core.c
	--- a/sys/dev/tpm/tpm_tis_core.c
	+++ b/sys/dev/tpm/tpm_tis_core.c
	@@ -474,6 +474,16 @@
	"Failed to read response\n");
	return (EIO);
	}
	+
	+ /*
	+ * Per TIS 1.3 section 5.6.12, write commandReady after reading the
	+ * response so the TPM can free the ReadFIFO and other internal
	+ * resources. The next tpmtis_go_ready() provides the second
	+ * write the spec mentions, and waits for the state transition,
	+ * so no wait is needed here.
	+ */
	+ TPM_WRITE_4(sc->dev, TPM_STS, TPM_STS_CMD_RDY);
	+ TPM_WRITE_BARRIER(sc->dev, TPM_STS, 4);
	tpmtis_relinquish_locality(sc);
	priv->offset = 0;
	priv->len = bytes_available;