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 <stef...@linux.vnet.ibm.com>
---
drivers/char/tpm/tpm-interface.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index ef0fcdb..a2688ac 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 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf,
size_t bufsiz,
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);
--
2.4.3
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