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Subject[PATCH] tpm_tis: Add missing start/stop_tpm_chip calls
Date
There is a missing call to start_tpm_chip before the call to
the tpm_get_timeouts() and tpm_tis_probe_irq_single(). As the current
approach maight work for tpm2, it fails for tpm1.x - in that case
call to tpm_get_timeouts() or tpm_tis_probe_irq_single() tries to
transmit TPM commands on a disabled chip what what doesn't succeed
and in turn causes tpm_tis_core_init() to fail.
Tested on Samsung Chromebook Pro (Caroline).

Signed-off-by: Lukasz Majczak <lma@semihalf.com>
---
drivers/char/tpm/tpm_tis_core.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 92c51c6cfd1b..ff0e5fe46a9d 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -1063,12 +1063,16 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
init_waitqueue_head(&priv->read_queue);
init_waitqueue_head(&priv->int_queue);
if (irq != -1) {
+ rc = tpm_chip_start(chip);
+ if (rc)
+ goto out_err;
/* Before doing irq testing issue a command to the TPM in polling mode
* to make sure it works. May as well use that command to set the
* proper timeouts for the driver.
*/
if (tpm_get_timeouts(chip)) {
dev_err(dev, "Could not get TPM timeouts and durations\n");
+ tpm_chip_stop(chip);
rc = -ENODEV;
goto out_err;
}
@@ -1085,6 +1089,7 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
} else {
tpm_tis_probe_irq(chip, intmask);
}
+ tpm_chip_stop(chip);
}

rc = tpm_chip_register(chip);
--
2.25.1
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