4.4-stable review patch.  If anyone has any objections, please let me know.


From: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>

commit 72fd50e14e46dc0edf360631bdece87c2f066a97 upstream.

The req_canceled() callback is used by tpm_transmit() periodically to
check whether the request has been canceled while it is receiving a
response from the TPM.

The TPM_CRB_CTRL_CANCEL register was cleared already in the crb_cancel
callback, which has two consequences:

* Cancel might not happen.
* req_canceled() always returns zero.

A better place to clear the register is when starting to send a new
command. The behavior of TPM_CRB_CTRL_CANCEL is described in the
section of the PTP specification.

Fixes: 30fc8d138e91 ("tpm: TPM 2.0 CRB Interface")
Signed-off-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

 drivers/char/tpm/tpm_crb.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -149,6 +149,11 @@ static int crb_send(struct tpm_chip *chi
        struct crb_priv *priv = chip->vendor.priv;
        int rc = 0;
+       /* Zero the cancel register so that the next command will not get
+        * canceled.
+        */
+       iowrite32(0, &priv->cca->cancel);
        if (len > le32_to_cpu(ioread32(&priv->cca->cmd_size))) {
                        "invalid command count value %x %zx\n",
@@ -182,8 +187,6 @@ static void crb_cancel(struct tpm_chip *
        if ((priv->flags & CRB_FL_ACPI_START) && crb_do_acpi_start(chip))
                dev_err(&chip->dev, "ACPI Start failed\n");
-       iowrite32(0, &priv->cca->cancel);
 static bool crb_req_canceled(struct tpm_chip *chip, u8 status)

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