[PATCH v3] tpm_tis: turn on TPM before calling tpm_get_timeouts

[Jerry Snitselaar]

With power gating moved out of the tpm_transmit code we need
to power on the TPM prior to calling tpm_get_timeouts.

Cc: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
Cc: Peter Huewe <peterhuewe@xxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Fixes: a3fbfae82b4c ("tpm: take TPM chip power gating out of tpm_transmit()")
Reported-by: Christian Bundy <christianbundy@xxxxxxxxxxx>
Signed-off-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx>
---
v3: call tpm_chip_stop in error path
v2: fix stable cc to correct address

 drivers/char/tpm/tpm_tis_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 270f43acbb77..806acc666696 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -974,13 +974,14 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 		 * to make sure it works. May as well use that command to set the
 		 * proper timeouts for the driver.
 		 */
+		tpm_chip_start(chip);
 		if (tpm_get_timeouts(chip)) {
 			dev_err(dev, "Could not get TPM timeouts and durations\n");
 			rc = -ENODEV;
+			tpm_chip_stop(chip);
 			goto out_err;
 		}
 
-		tpm_chip_start(chip);
 		chip->flags |= TPM_CHIP_FLAG_IRQ;
 		if (irq) {
 			tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
-- 
2.24.0