Commit 6804f6bb authored by Stefan Berger's avatar Stefan Berger Committed by Jarkko Sakkinen
Browse files

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: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
parent 2528a646

drivers/char/tpm/tpm-interface.c

+4 −2
Original line number Diff line number Diff line
@@ -357,6 +357,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz, 
	if (!(flags & TPM_TRANSMIT_UNLOCKED))

		mutex_lock(&chip->tpm_mutex);



	if (chip->dev.parent)

		pm_runtime_get_sync(chip->dev.parent);



	rc = chip->ops->send(chip, (u8 *) buf, count);
@@ -400,6 +401,7 @@ out_recv: 
		dev_err(&chip->dev,

			"tpm_transmit: tpm_recv: error %zd\n", rc);

out:

	if (chip->dev.parent)

		pm_runtime_put_sync(chip->dev.parent);



	if (!(flags & TPM_TRANSMIT_UNLOCKED))

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