From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5ABA3C433E0 for ; Mon, 25 Jan 2021 17:24:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 241ED21707 for ; Mon, 25 Jan 2021 17:24:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730901AbhAYRYI (ORCPT ); Mon, 25 Jan 2021 12:24:08 -0500 Received: from bhuna.collabora.co.uk ([46.235.227.227]:32880 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731022AbhAYRXc (ORCPT ); Mon, 25 Jan 2021 12:23:32 -0500 Received: from [IPv6:2804:214:81d7:a6cc:f83c:66c3:4225:e59d] (unknown [IPv6:2804:214:81d7:a6cc:f83c:66c3:4225:e59d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: koike) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 0FE701F45379; Mon, 25 Jan 2021 17:22:44 +0000 (GMT) Subject: Re: [PATCH v3 13/14] media: v4l2-async: Discourage use of v4l2_async_notifier_add_subdev To: Sakari Ailus , linux-media@vger.kernel.org Cc: Hans Verkuil , kernel@collabora.com, Laurent Pinchart , Kieran Bingham , Jacopo Mondi , niklas.soderlund+renesas@ragnatech.se, Dafna Hirschfeld , Hugues Fruchet , Nicolas Ferre , Yong Zhi , Sylwester Nawrocki , Maxime Ripard , Robert Foss , Philipp Zabel , Ezequiel Garcia References: <20210125132230.6600-1-sakari.ailus@linux.intel.com> <20210125132230.6600-28-sakari.ailus@linux.intel.com> From: Helen Koike Message-ID: Date: Mon, 25 Jan 2021 14:22:41 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: <20210125132230.6600-28-sakari.ailus@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On 1/25/21 10:22 AM, Sakari Ailus wrote: > From: Ezequiel Garcia > > Most -if not all- use-cases are expected to be covered by one of: > v4l2_async_notifier_add_fwnode_subdev, > v4l2_async_notifier_add_fwnode_remote_subdev or > v4l2_async_notifier_add_i2c_subdev. > > We'd like to discourage drivers from using v4l2_async_notifier_add_subdev, > so rename it as __v4l2_async_notifier_add_subdev. This is > typically a good hint for drivers to avoid using the function. > > Signed-off-by: Ezequiel Garcia > Reviewed-by: Laurent Pinchart > Signed-off-by: Sakari Ailus Reviewed-by: Helen Koike > --- > drivers/media/v4l2-core/v4l2-async.c | 8 ++++---- > drivers/media/v4l2-core/v4l2-fwnode.c | 2 +- > include/media/v4l2-async.h | 9 +++++++-- > 3 files changed, 12 insertions(+), 7 deletions(-) > > diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c > index 1f2b7aa1fca6..bd1944c2d062 100644 > --- a/drivers/media/v4l2-core/v4l2-async.c > +++ b/drivers/media/v4l2-core/v4l2-async.c > @@ -603,7 +603,7 @@ void v4l2_async_notifier_cleanup(struct v4l2_async_notifier *notifier) > } > EXPORT_SYMBOL_GPL(v4l2_async_notifier_cleanup); > > -int v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier, > +int __v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier, > struct v4l2_async_subdev *asd) > { > int ret; > @@ -620,7 +620,7 @@ int v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier, > mutex_unlock(&list_lock); > return ret; > } > -EXPORT_SYMBOL_GPL(v4l2_async_notifier_add_subdev); > +EXPORT_SYMBOL_GPL(__v4l2_async_notifier_add_subdev); > > struct v4l2_async_subdev * > v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier *notifier, > @@ -637,7 +637,7 @@ v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier *notifier, > asd->match_type = V4L2_ASYNC_MATCH_FWNODE; > asd->match.fwnode = fwnode_handle_get(fwnode); > > - ret = v4l2_async_notifier_add_subdev(notifier, asd); > + ret = __v4l2_async_notifier_add_subdev(notifier, asd); > if (ret) { > fwnode_handle_put(fwnode); > kfree(asd); > @@ -687,7 +687,7 @@ v4l2_async_notifier_add_i2c_subdev(struct v4l2_async_notifier *notifier, > asd->match.i2c.adapter_id = adapter_id; > asd->match.i2c.address = address; > > - ret = v4l2_async_notifier_add_subdev(notifier, asd); > + ret = __v4l2_async_notifier_add_subdev(notifier, asd); > if (ret) { > kfree(asd); > return ERR_PTR(ret); > diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c > index 5353e37eb950..919fde20032e 100644 > --- a/drivers/media/v4l2-core/v4l2-fwnode.c > +++ b/drivers/media/v4l2-core/v4l2-fwnode.c > @@ -833,7 +833,7 @@ v4l2_async_notifier_fwnode_parse_endpoint(struct device *dev, > if (ret < 0) > goto out_err; > > - ret = v4l2_async_notifier_add_subdev(notifier, asd); > + ret = __v4l2_async_notifier_add_subdev(notifier, asd); > if (ret < 0) { > /* not an error if asd already exists */ > if (ret == -EEXIST) > diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h > index 25c9ebd3f963..ef4ac3559be9 100644 > --- a/include/media/v4l2-async.h > +++ b/include/media/v4l2-async.h > @@ -138,17 +138,22 @@ void v4l2_async_debug_init(struct dentry *debugfs_dir); > void v4l2_async_notifier_init(struct v4l2_async_notifier *notifier); > > /** > - * v4l2_async_notifier_add_subdev - Add an async subdev to the > + * __v4l2_async_notifier_add_subdev - Add an async subdev to the > * notifier's master asd list. > * > * @notifier: pointer to &struct v4l2_async_notifier > * @asd: pointer to &struct v4l2_async_subdev > * > + * \warning: Drivers should avoid using this function and instead use one of: > + * @v4l2_async_notifier_add_fwnode_subdev, > + * @v4l2_async_notifier_add_fwnode_remote_subdev or > + * @v4l2_async_notifier_add_i2c_subdev. > + * > * Call this function before registering a notifier to link the provided @asd to > * the notifiers master @asd_list. The @asd must be allocated with k*alloc() as > * it will be freed by the framework when the notifier is destroyed. > */ > -int v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier, > +int __v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier, > struct v4l2_async_subdev *asd); > > /** >