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Message-Id: <20200210162838.173903-4-amirmizi6@gmail.com>
Date: Mon, 10 Feb 2020 18:28:34 +0200
From: amirmizi6@...il.com
To: Eyal.Cohen@...oton.com, jarkko.sakkinen@...ux.intel.com,
oshrialkoby85@...il.com, alexander.steffen@...ineon.com,
robh+dt@...nel.org, mark.rutland@....com, peterhuewe@....de,
jgg@...pe.ca, arnd@...db.de, gregkh@...uxfoundation.org
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-integrity@...r.kernel.org, oshri.alkoby@...oton.com,
tmaimon77@...il.com, gcwilson@...ibm.com, kgoldman@...ibm.com,
Dan.Morav@...oton.com, oren.tanami@...oton.com,
shmulik.hager@...oton.com, amir.mizinski@...oton.com,
Amir Mizinski <amirmizi6@...il.com>
Subject: [PATCH v3 3/7] char: tpm: rewrite "tpm_tis_req_canceled()"
From: Amir Mizinski <amirmizi6@...il.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@...il.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 6c4f232..18b9dc4 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -710,17 +710,7 @@ 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
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