On Fri, Feb 08, 2019 at 11:36:19AM -0500, Stefan Berger wrote:

On 2/8/19 11:30 AM, Jarkko Sakkinen wrote:

quoted

  static void tpm_nsc_cancel(struct tpm_chip *chip)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 60e2038652b8..1d781c19f112 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c

@@ -507,7 +507,11 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
  	if (!priv->irq_tested)
  		disable_interrupts(chip);
  	priv->irq_tested = true;
-	return rc;
+
+	if (rc < 0)
+		return rc;
+
+	return 0;
  }

That's not all... There's this above it as well with tpm_tis_send_main
returning with 'return len;'.

    if (!(chip->flags & TPM_CHIP_FLAG_IRQ) || priv->irq_tested)
        return tpm_tis_send_main(chip, buf, len);

OK, looks like that your suggestion to do it in *_main() was correct
after all.

/Jarkko