tpm_tis_core: Turn on the TPM before probing IRQ's

The interrupt probing sequence in tpm_tis_core cannot obviously run with
the TPM power gated. Power on the TPM with tpm_chip_start() before
probing IRQ's. Turn it off once the probing is complete.

Cc: linux-stable@vger.kernel.org
Fixes: a3fbfae82b4c ("tpm: take TPM chip power gating out of tpm_transmit()")
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index c3181ea..ffa9048 100644 (file)
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -980,6 +980,7 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
                        goto out_err;
                }
 
+               tpm_chip_start(chip);
                if (irq) {
                        tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
                                                 irq);
@@ -989,6 +990,7 @@ 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);