linux-kernel - [PATCH v2 1/1] tpm: add request_locality before write TPM_INT

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Message-ID: <20211013062556.116504-1-chenjun102@huawei.com>
Date:   Wed, 13 Oct 2021 06:25:56 +0000
From:   Chen Jun <chenjun102@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-integrity@...r.kernel.org>
CC:     <peterhuewe@....de>, <jarkko@...nel.org>, <jgg@...pe.ca>,
        <rui.xiang@...wei.com>
Subject: [PATCH v2 1/1] tpm: add request_locality before write TPM_INT_ENABLE

Locality is not appropriately requested before writing the int mask.
Add the missing boilerplate.

Fixes: e6aef069b6e9 ("tpm_tis: convert to using locality callbacks")
Signed-off-by: Chen Jun <chenjun102@...wei.com>
---

 v2: rewrite the commit message.

 drivers/char/tpm/tpm_tis_core.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 69579efb247b..bea587301917 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -978,7 +978,15 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 	intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
 		   TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
 	intmask &= ~TPM_GLOBAL_INT_ENABLE;
+
+	rc = request_locality(chip, 0);
+	if (rc < 0) {
+		rc = -ENODEV;
+		goto out_err;
+	}
+
 	tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
+	release_locality(chip, 0);
 
 	rc = tpm_chip_start(chip);
 	if (rc)
-- 
2.17.1