Messages in this thread Patch in this message | | | From | Ed Swierk <> | Subject | [PATCH v8 3/5] tpm: Clean up reading of timeout and duration capabilities | Date | Tue, 21 Jun 2016 18:10:29 -0700 |
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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: Ed Swierk <eswierk@skyportsystems.com> --- drivers/char/tpm/tpm-interface.c | 74 +++++++++++++++------------------------- 1 file changed, 27 insertions(+), 47 deletions(-)
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index cc1e5bc..b65c139 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -461,9 +461,19 @@ ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap, tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); tpm_cmd.params.getcap_in.subcap = subcap_id; } + rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc); + + if (!rc && + ((subcap_id == TPM_CAP_PROP_TIS_TIMEOUT && + be32_to_cpu(tpm_cmd.header.out.length) != TPM_HEADER_SIZE + 20) || + (subcap_id == TPM_CAP_PROP_TIS_DURATION && + be32_to_cpu(tpm_cmd.header.out.length) != TPM_HEADER_SIZE + 16))) + rc = -EINVAL; + if (!rc) *cap = tpm_cmd.params.getcap_out.cap; + return rc; } @@ -504,48 +514,30 @@ 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; - 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, NULL); - + rc = tpm_getcap(chip->pdev, 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->pdev, "Issuing TPM_STARTUP"); + dev_info(chip->pdev, "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, - NULL); - } - if (rc) { - dev_err(chip->pdev, - "A TPM error (%zd) occurred attempting to determine the timeouts\n", - rc); - goto duration; + rc = tpm_getcap(chip->pdev, 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)); /* @@ -583,29 +575,17 @@ int tpm_get_timeouts(struct tpm_chip *chip) chip->vendor.timeout_c = usecs_to_jiffies(new_timeout[2]); chip->vendor.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, - "attempting to determine the durations"); + rc = tpm_getcap(chip->pdev, 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->vendor.duration[TPM_SHORT] = - usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short)); + usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_short)); chip->vendor.duration[TPM_MEDIUM] = - usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium)); + usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium)); chip->vendor.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 -- 1.9.1
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