linux-kernel - [PATCH v2] tpm_tis: reserve chip for duration of tpm_tis_core

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Date:   Wed, 11 Dec 2019 16:54:55 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Christian Bundy <christianbundy@...ction.io>,
        Dan Williams <dan.j.williams@...el.com>,
        Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        stable@...r.kernel.org, linux-integrity@...r.kernel.org
Subject: [PATCH v2] tpm_tis: reserve chip for duration of tpm_tis_core_init

Instead of repeatedly calling tpm_chip_start/tpm_chip_stop when
issuing commands to the tpm during initialization, just reserve the
chip after wait_startup, and release it when we are ready to call
tpm_chip_register.

Cc: Christian Bundy <christianbundy@...ction.io>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Peter Huewe <peterhuewe@....de>
Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>
Cc: Stefan Berger <stefanb@...ux.vnet.ibm.com>
Cc: stable@...r.kernel.org
Cc: linux-integrity@...r.kernel.org
Fixes: a3fbfae82b4c ("tpm: take TPM chip power gating out of tpm_transmit()")
Fixes: 5b359c7c4372 ("tpm_tis_core: Turn on the TPM before probing IRQ's")
Signed-off-by: Jerry Snitselaar <jsnitsel@...hat.com>
---
v2: Fix integrity list address and add 5b359c7c4372 to fixes

 drivers/char/tpm/tpm_tis_core.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 8af2cee1a762..308756d278b3 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -978,13 +978,13 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 
 	if (wait_startup(chip, 0) != 0) {
 		rc = -ENODEV;
-		goto out_err;
+		goto out_start;
 	}
 
 	/* Take control of the TPM's interrupt hardware and shut it off */
 	rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
 	if (rc < 0)
-		goto out_err;
+		goto out_start;
 
 	intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
 		   TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
@@ -993,9 +993,8 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 
 	rc = tpm_chip_start(chip);
 	if (rc)
-		goto out_err;
+		goto out_start;
 	rc = tpm2_probe(chip);
-	tpm_chip_stop(chip);
 	if (rc)
 		goto out_err;
 
@@ -1059,7 +1058,6 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 			goto out_err;
 		}
 
-		tpm_chip_start(chip);
 		chip->flags |= TPM_CHIP_FLAG_IRQ;
 		if (irq) {
 			tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
@@ -1070,18 +1068,17 @@ 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);
 	}
+	tpm_chip_stop(chip);
 
 	rc = tpm_chip_register(chip);
 	if (rc)
-		goto out_err;
-
-	if (chip->ops->clk_enable != NULL)
-		chip->ops->clk_enable(chip, false);
+		goto out_start;
 
 	return 0;
 out_err:
+	tpm_chip_stop(chip);
+out_start:
 	if ((chip->ops != NULL) && (chip->ops->clk_enable != NULL))
 		chip->ops->clk_enable(chip, false);
 
-- 
2.24.0