From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3vNsqw4PCDzDq5s for ; Thu, 16 Feb 2017 08:29:32 +1100 (AEDT) Date: Wed, 15 Feb 2017 14:19:52 -0700 From: Scott Bauer To: Jon Derrick Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Rafael Antognolli , Jens Axboe , Christoph Hellwig , Greg Kroah-Hartman Subject: Re: [PATCHv3 2/4] block/sed: Add helper to qualify response tokens Message-ID: <20170215211952.GC2178@sbauer-Z170X-UD5> References: <1487187731-10293-1-git-send-email-jonathan.derrick@intel.com> <1487187731-10293-3-git-send-email-jonathan.derrick@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <1487187731-10293-3-git-send-email-jonathan.derrick@intel.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Wed, Feb 15, 2017 at 12:42:07PM -0700, Jon Derrick wrote: > 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; > +} > + This is sorta pedantic but from my reading of the code token can never be null. It will either be a valid pointer or ERR_PTR(-EINVAL), but never null. So maybe change this to IS_ERR(token) etc. Other than that little nit: Reviewed-by: Scott Bauer