Commit aaa6f7f6 authored by Ed Swierk's avatar Ed Swierk Committed by Jarkko Sakkinen
Browse files

tpm: Clean up reading of timeout and duration capabilities 



Call tpm_getcap() from tpm_get_timeouts() to eliminate redundant
code. Return all errors to the caller rather than swallowing them
(e.g. when tpm_transmit_cmd() returns nonzero).

Signed-off-by: default avatarEd Swierk <eswierk@skyportsystems.com>
Reviewed-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
parent 2c97f6f2

drivers/char/tpm/tpm-interface.c

+17 −48
Original line number Diff line number Diff line
@@ -493,10 +493,9 @@ static int tpm_startup(struct tpm_chip *chip, __be16 startup_type) 


int tpm_get_timeouts(struct tpm_chip *chip)

{

	struct tpm_cmd_t tpm_cmd;

	cap_t cap;

	unsigned long new_timeout[4];

	unsigned long old_timeout[4];

	struct duration_t *duration_cap;

	ssize_t rc;



	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
@@ -514,43 +513,25 @@ int tpm_get_timeouts(struct tpm_chip *chip) 
		return 0;

	}



	tpm_cmd.header.in = tpm_getcap_header;

	tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;

	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);

	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;

	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 0,

			      NULL);



	rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,

			"attempting to determine the timeouts");

	if (rc == TPM_ERR_INVALID_POSTINIT) {

		/* The TPM is not started, we are the first to talk to it.

		   Execute a startup command. */

		dev_info(&chip->dev, "Issuing TPM_STARTUP");

		dev_info(&chip->dev, "Issuing TPM_STARTUP\n");

		if (tpm_startup(chip, TPM_ST_CLEAR))

			return rc;



		tpm_cmd.header.in = tpm_getcap_header;

		tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;

		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);

		tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;

		rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,

				      0, NULL);

	}

	if (rc) {

		dev_err(&chip->dev,

			"A TPM error (%zd) occurred attempting to determine the timeouts\n",

			rc);

		goto duration;

		rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,

				"attempting to determine the timeouts");

	}

	if (rc)

		return rc;



	if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||

	    be32_to_cpu(tpm_cmd.header.out.length)

	    != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))

		return -EINVAL;



	old_timeout[0] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.a);

	old_timeout[1] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.b);

	old_timeout[2] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.c);

	old_timeout[3] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.d);

	old_timeout[0] = be32_to_cpu(cap.timeout.a);

	old_timeout[1] = be32_to_cpu(cap.timeout.b);

	old_timeout[2] = be32_to_cpu(cap.timeout.c);

	old_timeout[3] = be32_to_cpu(cap.timeout.d);

	memcpy(new_timeout, old_timeout, sizeof(new_timeout));



	/*
@@ -588,29 +569,17 @@ int tpm_get_timeouts(struct tpm_chip *chip) 
	chip->timeout_c = usecs_to_jiffies(new_timeout[2]);

	chip->timeout_d = usecs_to_jiffies(new_timeout[3]);



duration:

	tpm_cmd.header.in = tpm_getcap_header;

	tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;

	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);

	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;



	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 0,

	rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap,

			"attempting to determine the durations");

	if (rc)

		return rc;



	if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||

	    be32_to_cpu(tpm_cmd.header.out.length)

	    != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))

		return -EINVAL;



	duration_cap = &tpm_cmd.params.getcap_out.cap.duration;

	chip->duration[TPM_SHORT] =

	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));

		usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_short));

	chip->duration[TPM_MEDIUM] =

	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));

		usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium));

	chip->duration[TPM_LONG] =

	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));

		usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long));



	/* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above

	 * value wrong and apparently reports msecs rather than usecs. So we

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