tpm: turn on TPM on suspend for TPM 1.x

tpm_chip_start/stop() should be also called for TPM 1.x devices on
suspend. Add that functionality back. Do not lock the chip because
it is unnecessary as there are no multiple threads using it when
doing the suspend.

Fixes: 140b7e011cce ("tpm: take TPM chip power gating out of tpm_transmit()")
Reported-by: Paul Zimmerman <pauldzim@gmail.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Domenico Andreoli <domenico.andreoli@linux.com>
Signed-off-by: James Morris <james.morris@microsoft.com>

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 83ece5639f8639e7bb397ec4feeb121006073208..ae1030c9b086de511aa5c2bd0800fdcf6c2a1051 100644 (file)
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -402,15 +402,13 @@ int tpm_pm_suspend(struct device *dev)
        if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)
                return 0;
 
-       if (chip->flags & TPM_CHIP_FLAG_TPM2) {
-               mutex_lock(&chip->tpm_mutex);
-               if (!tpm_chip_start(chip)) {
+       if (!tpm_chip_start(chip)) {
+               if (chip->flags & TPM_CHIP_FLAG_TPM2)
                        tpm2_shutdown(chip, TPM2_SU_STATE);
-                       tpm_chip_stop(chip);
-               }
-               mutex_unlock(&chip->tpm_mutex);
-       } else {
-               rc = tpm1_pm_suspend(chip, tpm_suspend_pcr);
+               else
+                       rc = tpm1_pm_suspend(chip, tpm_suspend_pcr);
+
+               tpm_chip_stop(chip);
        }
 
        return rc;