From: amirmizi6@gmail.com
To: Eyal.Cohen@nuvoton.com, jarkko.sakkinen@linux.intel.com,
oshrialkoby85@gmail.com, alexander.steffen@infineon.com,
robh+dt@kernel.org, mark.rutland@arm.com, peterhuewe@gmx.de,
jgg@ziepe.ca, arnd@arndb.de, gregkh@linuxfoundation.org
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-integrity@vger.kernel.org, oshri.alkoby@nuvoton.com,
tmaimon77@gmail.com, gcwilson@us.ibm.com, kgoldman@us.ibm.com,
ayna@linux.vnet.ibm.com, Dan.Morav@nuvoton.com,
oren.tanami@nuvoton.com, shmulik.hager@nuvoton.com,
amir.mizinski@nuvoton.com, Amir Mizinski <amirmizi6@gmail.com>
Subject: [PATCH v1 3/5] char: tpm: rewrite "tpm_tis_req_canceled()"
Date: Mon, 2 Dec 2019 15:01:30 +0200 [thread overview]
Message-ID: <20191202130132.175382-4-amirmizi6@gmail.com> (raw)
In-Reply-To: <20191202130132.175382-1-amirmizi6@gmail.com>
From: Amir Mizinski <amirmizi6@gmail.com>
using this function while read/write data resulted in aborted operation.
after investigating according to TCG TPM Profile (PTP) Specifications,
i found cancel should happen only if TPM_STS.commandReady bit is lit
and couldn't find a case when the current condition is valid.
also only cmdReady bit need to be compared instead of the full lower status register byte.
Signed-off-by: Amir Mizinski <amirmizi6@gmail.com>
---
drivers/char/tpm/tpm_tis_core.c | 12 +-----------
1 file changed, 1 insertion(+), 11 deletions(-)
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index ce7f8a1..9016f06 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -627,17 +627,7 @@ static int probe_itpm(struct tpm_chip *chip)
static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
{
- struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
-
- switch (priv->manufacturer_id) {
- case TPM_VID_WINBOND:
- return ((status == TPM_STS_VALID) ||
- (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)));
- case TPM_VID_STM:
- return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY));
- default:
- return (status == TPM_STS_COMMAND_READY);
- }
+ return ((status & TPM_STS_COMMAND_READY) == TPM_STS_COMMAND_READY);
}
static irqreturn_t tis_int_handler(int dummy, void *dev_id)
--
2.7.4
next prev parent reply other threads:[~2019-12-02 13:02 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-02 13:01 [PATCH v1 0/5] add tpm i2c ptp driver amirmizi6
2019-12-02 13:01 ` [PATCH v1 1/5] char: tpm: Make implementation of read16 read32 write32 optional amirmizi6
2019-12-02 13:01 ` [PATCH v1 2/5] char: tpm: Add check_data handle to tpm_tis_phy_ops in order to check data integrity amirmizi6
2019-12-02 13:01 ` amirmizi6 [this message]
2019-12-02 13:01 ` [PATCH v1 4/5] dt-bindings: tpm: Add the TPM TIS I2C device tree binding documentaion amirmizi6
2019-12-02 13:01 ` [PATCH v1 5/5] char: tpm: add tpm_tis_i2c driver amirmizi6
-- strict thread matches above, loose matches on Subject: below --
2019-11-10 16:21 [PATCH v1 0/5] add tpm i2c ptp driver amirmizi6
2019-11-10 16:21 ` [PATCH v1 3/5] char: tpm: rewrite "tpm_tis_req_canceled()" amirmizi6
2019-11-10 18:00 ` Jerry Snitselaar
2019-11-12 1:25 ` Stefan Berger
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