From patchwork Tue Nov 6 17:36:38 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 10671097 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0809013BF for ; Tue, 6 Nov 2018 17:37:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EB7C02AD19 for ; Tue, 6 Nov 2018 17:37:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DF2272AD1C; Tue, 6 Nov 2018 17:37:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7FC712AD19 for ; Tue, 6 Nov 2018 17:37:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389615AbeKGDEH (ORCPT ); Tue, 6 Nov 2018 22:04:07 -0500 Received: from mga11.intel.com ([192.55.52.93]:59362 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389275AbeKGDEH (ORCPT ); Tue, 6 Nov 2018 22:04:07 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Nov 2018 09:37:50 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,472,1534834800"; d="scan'208";a="87127145" Received: from wenjiewa-mobl2.ccr.corp.intel.com (HELO localhost) ([10.249.254.60]) by orsmga007.jf.intel.com with ESMTP; 06 Nov 2018 09:37:44 -0800 From: Jarkko Sakkinen To: linux-integrity@vger.kernel.org Cc: linux-security-module@vger.kernel.org, James Bottomley , Tomas Winkler , Tadeusz Struk , Stefan Berger , Nayna Jain , Jarkko Sakkinen , Peter Huewe , Jason Gunthorpe , Arnd Bergmann , Greg Kroah-Hartman , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v4 06/17] tpm: clean up tpm_try_transmit() error handling flow Date: Tue, 6 Nov 2018 19:36:38 +0200 Message-Id: <20181106173652.31020-7-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181106173652.31020-1-jarkko.sakkinen@linux.intel.com> References: <20181106173652.31020-1-jarkko.sakkinen@linux.intel.com> MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Move locking, locality handling and power management to tpm_transmit() in order to simplify the flow. Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm-interface.c | 71 ++++++++++++++++---------------- 1 file changed, 35 insertions(+), 36 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 7ffb16edab6f..28d48799b044 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -171,7 +171,6 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, ssize_t len = 0; u32 count, ordinal; unsigned long stop; - bool need_locality; rc = tpm_validate_command(chip, space, buf, bufsiz); if (rc == -EINVAL) @@ -201,30 +200,9 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, return -E2BIG; } - if (!(flags & TPM_TRANSMIT_UNLOCKED) && !(flags & TPM_TRANSMIT_NESTED)) - mutex_lock(&chip->tpm_mutex); - - if (chip->ops->clk_enable != NULL) - chip->ops->clk_enable(chip, true); - - /* Store the decision as chip->locality will be changed. */ - need_locality = chip->locality == -1; - - if (need_locality) { - rc = tpm_request_locality(chip, flags); - if (rc < 0) { - need_locality = false; - goto out_locality; - } - } - - rc = tpm_cmd_ready(chip, flags); - if (rc) - goto out_locality; - rc = tpm2_prepare_space(chip, space, ordinal, buf); if (rc) - goto out_idle; + return rc; rc = chip->ops->send(chip, buf, count); if (rc < 0) { @@ -273,19 +251,6 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, else rc = tpm2_commit_space(chip, space, ordinal, buf, &len); -out_idle: - /* may fail but do not override previous error value in rc */ - tpm_go_idle(chip, flags); - -out_locality: - if (need_locality) - tpm_relinquish_locality(chip, flags); - - if (chip->ops->clk_enable != NULL) - chip->ops->clk_enable(chip, false); - - if (!(flags & TPM_TRANSMIT_UNLOCKED) && !(flags & TPM_TRANSMIT_NESTED)) - mutex_unlock(&chip->tpm_mutex); return rc ? rc : len; } @@ -315,6 +280,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, /* space for header and handles */ u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)]; unsigned int delay_msec = TPM2_DURATION_SHORT; + bool has_locality = false; u32 rc = 0; ssize_t ret; const size_t save_size = min(space ? sizeof(save) : TPM_HEADER_SIZE, @@ -330,7 +296,40 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, memcpy(save, buf, save_size); for (;;) { + if (!(flags & TPM_TRANSMIT_UNLOCKED) && + !(flags & TPM_TRANSMIT_NESTED)) + mutex_lock(&chip->tpm_mutex); + + if (chip->ops->clk_enable != NULL) + chip->ops->clk_enable(chip, true); + + if (chip->locality == -1) { + ret = tpm_request_locality(chip, flags); + if (ret) + goto out_locality; + has_locality = true; + } + + ret = tpm_cmd_ready(chip, flags); + if (ret) + goto out_locality; + ret = tpm_try_transmit(chip, space, buf, bufsiz, flags); + + /* This may fail but do not override ret. */ + tpm_go_idle(chip, flags); + +out_locality: + if (has_locality) + tpm_relinquish_locality(chip, flags); + + if (chip->ops->clk_enable != NULL) + chip->ops->clk_enable(chip, false); + + if (!(flags & TPM_TRANSMIT_UNLOCKED) && + !(flags & TPM_TRANSMIT_NESTED)) + mutex_unlock(&chip->tpm_mutex); + if (ret < 0) break; rc = be32_to_cpu(header->return_code);