linux-kernel - [PATCH 5.3 254/344] tpm_tis_core: Turn on the TPM before probing IRQs

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Message-Id: <20191003154605.551941556@linuxfoundation.org>
Date:   Thu,  3 Oct 2019 17:53:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, linux-stable@...r.kernel.org,
        Stefan Berger <stefanb@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Subject: [PATCH 5.3 254/344] tpm_tis_core: Turn on the TPM before probing IRQs

From: Stefan Berger <stefanb@...ux.ibm.com>

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@...r.kernel.org
Fixes: a3fbfae82b4c ("tpm: take TPM chip power gating out of tpm_transmit()")
Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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);