From mboxrd@z Thu Jan 1 00:00:00 1970 From: stefanb@linux.vnet.ibm.com (Stefan Berger) Date: Tue, 26 Jun 2018 15:30:39 -0400 Subject: [PATCH 1/2] tpm: Implement public tpm_put_chip() to release reference to chip In-Reply-To: <20180626193040.2509798-1-stefanb@linux.vnet.ibm.com> References: <20180626193040.2509798-1-stefanb@linux.vnet.ibm.com> Message-ID: <20180626193040.2509798-2-stefanb@linux.vnet.ibm.com> To: linux-security-module@vger.kernel.org List-Id: linux-security-module.vger.kernel.org Some subsystems that got a hold of a TPM chip through tpm_default_chip() need a way to release the reference to the TPM chip when they shut down. The tpm_put_chip() function enables this. Signed-off-by: Stefan Berger --- drivers/char/tpm/tpm-chip.c | 10 ++++++++++ include/linux/tpm.h | 4 ++++ 2 files changed, 14 insertions(+) diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 46caadca916a..c744289d82e0 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -80,6 +80,16 @@ void tpm_put_ops(struct tpm_chip *chip) } EXPORT_SYMBOL_GPL(tpm_put_ops); +/** + * tpm_put_chip() - Releae a ref to the tpm_chip + * @chip: Chip to put + */ +void tpm_put_chip(struct tpm_chip *chip) +{ + put_device(&chip->dev); +} +EXPORT_SYMBOL_GPL(tpm_put_chip); + /** * tpm_default_chip() - find a TPM chip and get a reference to it */ diff --git a/include/linux/tpm.h b/include/linux/tpm.h index e0e51c49a0e6..889dafe739e1 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -62,6 +62,7 @@ extern int tpm_unseal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload, struct trusted_key_options *options); extern struct tpm_chip *tpm_default_chip(void); +extern void tpm_put_chip(struct tpm_chip *chip); #else static inline int tpm_is_tpm2(struct tpm_chip *chip) { @@ -101,5 +102,8 @@ static inline struct tpm_chip *tpm_default_chip(void) { return NULL; } +static inline void tpm_put_chip(struct tpm_chip *chip) +{ +} #endif #endif -- 2.17.1 -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html