diff options
| author |   Stefan Berger <stefanb@linux.vnet.ibm.com> | 2016-11-07 07:14:33 -0500 |
|---|---|---|
| committer |   Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2016-11-28 01:31:31 +0200 |
| commit | 6804f6bba09997393904a112f2043963a8e08abf (patch) | |
| tree | ba8fc05633ceb4f71eaa0a719c1ef1f5840b6601 /drivers/char | |
| parent | tpm: define a generic open() method for ascii & bios measurements (diff) | |
| download | wireguard-linux-6804f6bba09997393904a112f2043963a8e08abf.tar.xz wireguard-linux-6804f6bba09997393904a112f2043963a8e08abf.zip | |
tpm: Only call pm_runtime_get_sync if device has a parent
Only call pm_runtime_get_sync if the device has a parent. This
change fixes a crash in the tpm_vtpm_proxy driver since that
driver does not have a parent device.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm-interface.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index ef0fcdb40cc3..a2688ac2b48f 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -357,7 +357,8 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz, if (!(flags & TPM_TRANSMIT_UNLOCKED)) mutex_lock(&chip->tpm_mutex); - pm_runtime_get_sync(chip->dev.parent); + if (chip->dev.parent) + pm_runtime_get_sync(chip->dev.parent); rc = chip->ops->send(chip, (u8 *) buf, count); if (rc < 0) { @@ -400,7 +401,8 @@ out_recv: dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %zd\n", rc); out: - pm_runtime_put_sync(chip->dev.parent); + if (chip->dev.parent) + pm_runtime_put_sync(chip->dev.parent); if (!(flags & TPM_TRANSMIT_UNLOCKED)) mutex_unlock(&chip->tpm_mutex); |