add shutdown call back to close existing session with fTPM TA to support kexec scenario.

Signed-off-by: Thirupathaiah Annapureddy thiruan@microsoft.com Signed-off-by: Pavel Tatashin pasha.tatashin@soleen.com --- drivers/char/tpm/tpm_ftpm_tee.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)

diff --git a/drivers/char/tpm/tpm_ftpm_tee.c b/drivers/char/tpm/tpm_ftpm_tee.c index 6640a14dbe48..ad16ea555e97 100644 --- a/drivers/char/tpm/tpm_ftpm_tee.c +++ b/drivers/char/tpm/tpm_ftpm_tee.c @@ -328,6 +328,19 @@ static int ftpm_tee_remove(struct platform_device *pdev) return 0; }

+/** + * ftpm_tee_shutdown - shutdown the TPM device + * @pdev: the platform_device description. + */ +static void ftpm_tee_shutdown(struct platform_device *pdev) +{ + struct ftpm_tee_private *pvt_data = dev_get_drvdata(&pdev->dev); + + tee_shm_free(pvt_data->shm); + tee_client_close_session(pvt_data->ctx, pvt_data->session); + tee_client_close_context(pvt_data->ctx); +} + static const struct of_device_id of_ftpm_tee_ids[] = { { .compatible = "microsoft,ftpm" }, { } @@ -341,6 +354,7 @@ static struct platform_driver ftpm_tee_driver = { }, .probe = ftpm_tee_probe, .remove = ftpm_tee_remove, + .shutdown = ftpm_tee_shutdown, };

module_platform_driver(ftpm_tee_driver);