From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751796AbdBOTmW (ORCPT ); Wed, 15 Feb 2017 14:42:22 -0500 Received: from mga04.intel.com ([192.55.52.120]:29259 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750905AbdBOTmQ (ORCPT ); Wed, 15 Feb 2017 14:42:16 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.35,166,1484035200"; d="scan'208";a="65613145" From: Jon Derrick Cc: Jon Derrick , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Scott Bauer , Rafael Antognolli , Jens Axboe , Christoph Hellwig , Greg Kroah-Hartman Subject: [PATCHv3 2/4] block/sed: Add helper to qualify response tokens Date: Wed, 15 Feb 2017 12:42:07 -0700 Message-Id: <1487187731-10293-3-git-send-email-jonathan.derrick@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1487187731-10293-1-git-send-email-jonathan.derrick@intel.com> References: <1487187731-10293-1-git-send-email-jonathan.derrick@intel.com> To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add helper which verifies the response token is valid and matches the expected value. Merges token_type and response_get_token. Signed-off-by: Jon Derrick --- block/sed-opal.c | 61 +++++++++++++++++++++++--------------------------------- 1 file changed, 25 insertions(+), 36 deletions(-) diff --git a/block/sed-opal.c b/block/sed-opal.c index 77623ad..d6dd604 100644 --- a/block/sed-opal.c +++ b/block/sed-opal.c @@ -591,48 +591,25 @@ static int cmd_finalize(struct opal_dev *cmd, u32 hsn, u32 tsn) return 0; } -static enum opal_response_token token_type(const struct parsed_resp *resp, - int n) +static const struct opal_resp_tok *response_get_token( + const struct parsed_resp *resp, + int n) { const struct opal_resp_tok *tok; if (n >= resp->num) { pr_err("Token number doesn't exist: %d, resp: %d\n", n, resp->num); - return OPAL_DTA_TOKENID_INVALID; + return ERR_PTR(-EINVAL); } tok = &resp->toks[n]; if (tok->len == 0) { pr_err("Token length must be non-zero\n"); - return OPAL_DTA_TOKENID_INVALID; + return ERR_PTR(-EINVAL); } - return tok->type; -} - -/* - * This function returns 0 in case of invalid token. One should call - * token_type() first to find out if the token is valid or not. - */ -static enum opal_token response_get_token(const struct parsed_resp *resp, - int n) -{ - const struct opal_resp_tok *tok; - - if (n >= resp->num) { - pr_err("Token number doesn't exist: %d, resp: %d\n", - n, resp->num); - return 0; - } - - tok = &resp->toks[n]; - if (tok->len == 0) { - pr_err("Token length must be non-zero\n"); - return 0; - } - - return tok->pos[0]; + return tok; } static ssize_t response_parse_tiny(struct opal_resp_tok *tok, @@ -851,20 +828,32 @@ static u64 response_get_u64(const struct parsed_resp *resp, int n) return resp->toks[n].stored.u; } +static bool response_token_matches(const struct opal_resp_tok *token, u8 match) +{ + if (IS_ERR_OR_NULL(token) || + token->type != OPAL_DTA_TOKENID_TOKEN || + token->pos[0] != match) + return false; + return true; +} + static u8 response_status(const struct parsed_resp *resp) { - if (token_type(resp, 0) == OPAL_DTA_TOKENID_TOKEN && - response_get_token(resp, 0) == OPAL_ENDOFSESSION) { + const struct opal_resp_tok *tok; + + tok = response_get_token(resp, 0); + if (response_token_matches(tok, OPAL_ENDOFSESSION)) return 0; - } if (resp->num < 5) return DTAERROR_NO_METHOD_STATUS; - if (token_type(resp, resp->num - 1) != OPAL_DTA_TOKENID_TOKEN || - token_type(resp, resp->num - 5) != OPAL_DTA_TOKENID_TOKEN || - response_get_token(resp, resp->num - 1) != OPAL_ENDLIST || - response_get_token(resp, resp->num - 5) != OPAL_STARTLIST) + tok = response_get_token(resp, resp->num - 5); + if (!response_token_matches(tok, OPAL_STARTLIST)) + return DTAERROR_NO_METHOD_STATUS; + + tok = response_get_token(resp, resp->num - 1); + if (!response_token_matches(tok, OPAL_ENDLIST)) return DTAERROR_NO_METHOD_STATUS; return response_get_u64(resp, resp->num - 4); -- 1.8.3.1