From: Stefan Berger <stefanb@xxxxxxxxxxxxx> commit 5b359c7c43727e624eac3efc7ad21bd2defea161 upstream. 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@xxxxxxxxxxxxxxx Fixes: a3fbfae82b4c ("tpm: take TPM chip power gating out of tpm_transmit()") Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/char/tpm/tpm_tis_core.c | 2 ++ 1 file changed, 2 insertions(+) --- 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 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 } else { tpm_tis_probe_irq(chip, intmask); } + tpm_chip_stop(chip); } rc = tpm_chip_register(chip);