From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753190AbcISUWb (ORCPT ); Mon, 19 Sep 2016 16:22:31 -0400 Received: from mga11.intel.com ([192.55.52.93]:40411 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753060AbcISUW3 (ORCPT ); Mon, 19 Sep 2016 16:22:29 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.30,363,1470726000"; d="scan'208";a="10962443" From: Jarkko Sakkinen To: Peter Huewe Cc: Ed Swierk , Jarkko Sakkinen , Marcel Selhorst , Jason Gunthorpe , tpmdd-devel@lists.sourceforge.net (moderated list:TPM DEVICE DRIVER), linux-kernel@vger.kernel.org (open list) Subject: [PATCH 1/2] tpm: Clean up reading of timeout and duration capabilities Date: Mon, 19 Sep 2016 23:22:08 +0300 Message-Id: <1474316530-17315-2-git-send-email-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1474316530-17315-1-git-send-email-jarkko.sakkinen@linux.intel.com> References: <1474316530-17315-1-git-send-email-jarkko.sakkinen@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ed Swierk 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 Reviewed-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm-interface.c | 65 +++++++++++----------------------------- 1 file changed, 17 insertions(+), 48 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 8de6187..ca6162e 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -488,10 +488,9 @@ 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) { @@ -509,43 +508,25 @@ 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); + rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, + "attempting to determine the timeouts"); } - if (rc) { - dev_err(&chip->dev, - "A TPM error (%zd) occurred attempting to determine the timeouts\n", - rc); - goto duration; - } - - 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; + if (rc) + return rc; - 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 +564,17 @@ 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, - "attempting to determine the durations"); + 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 -- 2.7.4