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tpm_crb: fix crb_req_canceled behavior
The req_canceled() callback is used by tpm_transmit() periodically to
check whether the request has been canceled while it is receiving a
response from the TPM.
The TPM_CRB_CTRL_CANCEL register was cleared already in the crb_cancel
callback, which has two consequences:
* Cancel might not happen.
* req_canceled() always returns zero.
A better place to clear the register is when starting to send a new
command. The behavior of TPM_CRB_CTRL_CANCEL is described in the
section 5.5.3.6 of the PTP specification.
CC: stable@vger.kernel.org
Fixes: 30fc8d138e
("tpm: TPM 2.0 CRB Interface")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
parent
0c54133223
commit
72fd50e14e
@ -142,6 +142,11 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
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struct crb_priv *priv = dev_get_drvdata(&chip->dev);
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int rc = 0;
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/* Zero the cancel register so that the next command will not get
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* canceled.
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*/
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iowrite32(0, &priv->cca->cancel);
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if (len > ioread32(&priv->cca->cmd_size)) {
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dev_err(&chip->dev,
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"invalid command count value %x %zx\n",
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@ -175,8 +180,6 @@ static void crb_cancel(struct tpm_chip *chip)
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if ((priv->flags & CRB_FL_ACPI_START) && crb_do_acpi_start(chip))
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dev_err(&chip->dev, "ACPI Start failed\n");
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iowrite32(0, &priv->cca->cancel);
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}
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static bool crb_req_canceled(struct tpm_chip *chip, u8 status)
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