linux-kernel - [PATCH v4 3/7] tpm: tpm_tis: rewrite "tpm_tis_req

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Date:   Tue, 31 Mar 2020 14:32:03 +0300
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 v4 3/7] tpm: tpm_tis: 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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