From patchwork Fri Jul 15 12:28:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nuno Sa X-Patchwork-Id: 12919179 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 47DE6CCA47C for ; Fri, 15 Jul 2022 12:30:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234487AbiGOMaA (ORCPT ); Fri, 15 Jul 2022 08:30:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45390 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234510AbiGOM34 (ORCPT ); Fri, 15 Jul 2022 08:29:56 -0400 Received: from mx0a-00128a01.pphosted.com (mx0a-00128a01.pphosted.com [148.163.135.77]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8ADEF72EDC for ; Fri, 15 Jul 2022 05:29:55 -0700 (PDT) Received: from pps.filterd (m0167089.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 26FB9r7m028074; Fri, 15 Jul 2022 08:29:05 -0400 Received: from nwd2mta3.analog.com ([137.71.173.56]) by mx0a-00128a01.pphosted.com (PPS) with ESMTPS id 3h9r37te47-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 15 Jul 2022 08:29:04 -0400 Received: from ASHBMBX9.ad.analog.com (ASHBMBX9.ad.analog.com [10.64.17.10]) by nwd2mta3.analog.com (8.14.7/8.14.7) with ESMTP id 26FCT3An061317 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 15 Jul 2022 08:29:03 -0400 Received: from ASHBMBX8.ad.analog.com (10.64.17.5) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.14; Fri, 15 Jul 2022 08:29:02 -0400 Received: from zeus.spd.analog.com (10.66.68.11) by ashbmbx8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server id 15.2.986.14 via Frontend Transport; Fri, 15 Jul 2022 08:29:02 -0400 Received: from nsa.ad.analog.com ([10.44.3.55]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 26FCRxNx001007; Fri, 15 Jul 2022 08:28:51 -0400 From: =?utf-8?q?Nuno_S=C3=A1?= To: , , , , , , , , , Lad Prabhakar , CC: Gwendal Grignou , Jonathan Cameron , Saravanan Sekar , Tomer Maimon , Maxime Coquelin , Alexandre Torgue , Lorenzo Bianconi , Fabio Estevam , Shawn Guo , Olivier Moysan , Tali Perry , Thara Gopinath , Bjorn Andersson , Arnd Bergmann , Benjamin Fair , Nicolas Ferre , "Rafael J. Wysocki" , Patrick Venture , Pengutronix Kernel Team , Fabrice Gasnier , Daniel Lezcano , Benson Leung , Nancy Yuen , Miquel Raynal , Alexandre Belloni , Zhang Rui , Linus Walleij , Christophe Branchereau , Cai Huoqing , Avi Fishman , Eugen Hristev , Matthias Brugger , Sascha Hauer , Lars-Peter Clausen , Andy Shevchenko , Guenter Roeck , Paul Cercueil , Claudiu Beznea , Andy Gross , Amit Kucheria , Michael Hennerich , Haibo Chen , Jishnu Prakash Subject: [PATCH v3 03/15] iio: inkern: only return error codes in iio_channel_get_*() APIs Date: Fri, 15 Jul 2022 14:28:51 +0200 Message-ID: <20220715122903.332535-4-nuno.sa@analog.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220715122903.332535-1-nuno.sa@analog.com> References: <20220715122903.332535-1-nuno.sa@analog.com> MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-GUID: _fHFyVnBt1JyKX4jrH56OTR187qkYJmU X-Proofpoint-ORIG-GUID: _fHFyVnBt1JyKX4jrH56OTR187qkYJmU X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-07-15_04,2022-07-15_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 clxscore=1015 priorityscore=1501 phishscore=0 spamscore=0 mlxlogscore=999 mlxscore=0 adultscore=0 suspectscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2207150054 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org APIs like of_iio_channel_get_by_name() and of_iio_channel_get_all() were returning a mix of NULL and pointers with NULL being the way to "notify" that we should do a "system" lookup for channels. This make it very confusing and prone to errors as commit 9f63cc0921ec ("iio: inkern: fix return value in devm_of_iio_channel_get_by_name()") proves. On top of this, patterns like 'if (channel != NULL) return channel' were being used where channel could actually be an error code which makes the code hard to read. This change also makes some functional changes on how errors were being handled. In the original behavior, even if we get an error like '-ENOMEM', we still continue with the search. We should only continue to lookup for the channel when it makes sense to do so. Hence, the main error handling in 'of_iio_channel_get_by_name()' is changed to the following logic: * If a channel 'name' is provided and we do find it via 'io-channel-names', we should be able to get it. If we get any error, we should not proceed with the lookup. Moreover, we should return an error so that callers won't proceed with a system lookup. * If a channel 'name' is provided and we cannot find it ('index < 0'), 'of_parse_phandle_with_args()' is expected to fail with '-EINVAL'. Hence, we should only continue if we get that error. * If a channel 'name' is not provided we should only carry on with the search if 'of_parse_phandle_with_args()' returns '-ENOENT'. Also note that a system channel lookup is only done if the returned error code (from 'of_iio_channel_get_by_name()' or 'of_iio_channel_get_all()' is -ENODEV. Signed-off-by: Nuno Sá Reviewed-by: Andy Shevchenko --- drivers/iio/inkern.c | 54 +++++++++++++++++++++++++++++++------------- 1 file changed, 38 insertions(+), 16 deletions(-) diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index 87fd2a0d44f2..c6f1cfe09bd3 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -214,7 +214,7 @@ static struct iio_channel *of_iio_channel_get(struct device_node *np, int index) struct iio_channel *of_iio_channel_get_by_name(struct device_node *np, const char *name) { - struct iio_channel *chan = NULL; + struct iio_channel *chan; /* Walk up the tree of devices looking for a matching iio channel */ while (np) { @@ -231,13 +231,33 @@ struct iio_channel *of_iio_channel_get_by_name(struct device_node *np, name); chan = of_iio_channel_get(np, index); if (!IS_ERR(chan) || PTR_ERR(chan) == -EPROBE_DEFER) - break; - else if (name && index >= 0) { - pr_err("ERROR: could not get IIO channel %pOF:%s(%i)\n", - np, name ? name : "", index); - return NULL; + return chan; + if (name) { + if (index >= 0) { + pr_err("ERROR: could not get IIO channel %pOF:%s(%i)\n", + np, name, index); + /* + * In this case, we found 'name' in 'io-channel-names' + * but somehow we still fail so that we should not proceed + * with any other lookup. Hence, explicitly return -EINVAL + * (maybe not the better error code) so that the caller + * won't do a system lookup. + */ + return ERR_PTR(-EINVAL); + } + /* If index < 0, then of_parse_phandle_with_args() fails + * with -EINVAL which is expected. We should not proceed + * if we get any other error. + */ + if (PTR_ERR(chan) != -EINVAL) + return chan; + } else if (PTR_ERR(chan) != -ENOENT) { + /* + * if !name, then we should only proceed the lookup if + * of_parse_phandle_with_args() returns -ENOENT. + */ + return chan; } - /* * No matching IIO channel found on this node. * If the parent node has a "io-channel-ranges" property, @@ -245,10 +265,10 @@ struct iio_channel *of_iio_channel_get_by_name(struct device_node *np, */ np = np->parent; if (np && !of_get_property(np, "io-channel-ranges", NULL)) - return NULL; + return ERR_PTR(-ENODEV); } - return chan; + return ERR_PTR(-ENODEV); } EXPORT_SYMBOL_GPL(of_iio_channel_get_by_name); @@ -267,8 +287,8 @@ static struct iio_channel *of_iio_channel_get_all(struct device *dev) break; } while (++nummaps); - if (nummaps == 0) /* no error, return NULL to search map table */ - return NULL; + if (nummaps == 0) + return ERR_PTR(-ENODEV); /* NULL terminated array to save passing size */ chans = kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL); @@ -295,7 +315,7 @@ static struct iio_channel *of_iio_channel_get_all(struct device *dev) static inline struct iio_channel *of_iio_channel_get_all(struct device *dev) { - return NULL; + return ERR_PTR(-ENODEV); } #endif /* CONFIG_OF */ @@ -362,7 +382,7 @@ struct iio_channel *iio_channel_get(struct device *dev, if (dev) { channel = of_iio_channel_get_by_name(dev->of_node, channel_name); - if (channel != NULL) + if (!IS_ERR(channel) || PTR_ERR(channel) != -ENODEV) return channel; } @@ -412,8 +432,6 @@ struct iio_channel *devm_of_iio_channel_get_by_name(struct device *dev, channel = of_iio_channel_get_by_name(np, channel_name); if (IS_ERR(channel)) return channel; - if (!channel) - return ERR_PTR(-ENODEV); ret = devm_add_action_or_reset(dev, devm_iio_channel_free, channel); if (ret) @@ -436,7 +454,11 @@ struct iio_channel *iio_channel_get_all(struct device *dev) return ERR_PTR(-EINVAL); chans = of_iio_channel_get_all(dev); - if (chans) + /* + * We only want to carry on if the error is -ENODEV. Anything else + * should be reported up the stack. + */ + if (!IS_ERR(chans) || PTR_ERR(chans) != -ENODEV) return chans; name = dev_name(dev);