linux-kernel - [PATCH v10 12/14] tpm, tpm_tis: Claim locality when interrupts are reenabled on resume

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Date:   Sun, 20 Nov 2022 14:31:32 +0100
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     peterhuewe@....de, jarkko@...nel.org, jgg@...pe.ca
Cc:     stefanb@...ux.vnet.ibm.com, linux@...ewoehner.de,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        jandryuk@...il.com, pmenzel@...gen.mpg.de, l.sanfilippo@...bus.com,
        LinoSanfilippo@....de, lukas@...ner.de, p.rosenberger@...bus.com
Subject: [PATCH v10 12/14] tpm, tpm_tis: Claim locality when interrupts are reenabled on resume

From: Lino Sanfilippo <l.sanfilippo@...bus.com>

In tpm_tis_resume() make sure that the locality has been claimed when
tpm_tis_reenable_interrupts() is called. Otherwise the writings to the
register might not have any effect.

Fixes: 45baa1d1fa39 ("tpm_tis: Re-enable interrupts upon (S3) resume")
Signed-off-by: Lino Sanfilippo <l.sanfilippo@...bus.com>
---
 drivers/char/tpm/tpm_tis_core.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 4312c5cc13da..2514e60f6778 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -1220,28 +1220,27 @@ int tpm_tis_resume(struct device *dev)
 	struct tpm_chip *chip = dev_get_drvdata(dev);
 	int ret;
 
+	ret = tpm_tis_request_locality(chip, 0);
+	if (ret < 0)
+		return ret;
+
 	if (chip->flags & TPM_CHIP_FLAG_IRQ)
 		tpm_tis_reenable_interrupts(chip);
 
 	ret = tpm_pm_resume(dev);
 	if (ret)
-		return ret;
+		goto out;
 
 	/*
 	 * TPM 1.2 requires self-test on resume. This function actually returns
 	 * an error code but for unknown reason it isn't handled.
 	 */
-	if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
-		ret = tpm_tis_request_locality(chip, 0);
-		if (ret < 0)
-			return ret;
-
+	if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
 		tpm1_do_selftest(chip);
+out:
+	tpm_tis_relinquish_locality(chip, 0);
 
-		tpm_tis_relinquish_locality(chip, 0);
-	}
-
-	return 0;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(tpm_tis_resume);
 #endif
-- 
2.36.1