From patchwork Wed Dec 18 00:01:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zijun Hu X-Patchwork-Id: 13912731 Received: from mr85p00im-ztdg06011201.me.com (mr85p00im-ztdg06011201.me.com [17.58.23.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6910F14B06A for ; Wed, 18 Dec 2024 00:02:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=17.58.23.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734480160; cv=none; b=bBTIf0fS5XlB/BI8u7tpAW+DA5Z3hbtUjrMNgTknHDnI9H/cyDHVjF9iBI0m3x3LLa/tNwgUBsmNiildxyPn+I157enTIKrjKSuM9ktO1dyqGu4DZWkCO4cGX31+7L4pD9OUAp8qurD9IAJEhcSfwjL5B4ilNQ65KuCafAKkRhw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734480160; c=relaxed/simple; bh=G49zBKYjNI4Lr2O92y6LMZppduNJ4fYsvssXA+rD8DU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=jL6W5YORT+MB89oOG4j+ixOI7uxrR/qlCqXqpG2VypQ8T4JP5iu8fQsR8PvngQ/qVf3brFrWrayHWbM+sLjYjHqzr9adFj3gci2380cIcLf/W24OamsBpKf6iDWKUE3tU0PE1r55zZKR1Q0v27kFSTr246O2ZIKGAi9k47yxx9A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=icloud.com; spf=pass smtp.mailfrom=icloud.com; dkim=pass (2048-bit key) header.d=icloud.com header.i=@icloud.com header.b=UUS7809b; arc=none smtp.client-ip=17.58.23.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=icloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=icloud.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=icloud.com header.i=@icloud.com header.b="UUS7809b" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=icloud.com; s=1a1hai; t=1734480159; bh=cOPHgek+7txVXNgAZKPNrM641zXSkIkTh3Riom+d1rc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To: x-icloud-hme; b=UUS7809bi9IRKOia8eeN3oT/j6sb15b2Vi7Enta+6kp4t2V/5dZxUjS1kqTvSSJgf 2cZjz9wXoOL09iuJjZjp8+g6jF/TabqAOvQRnHBTR0WsB9aheiJh5E0VsDVyx6hgE8 XxrvNZa/NHnD+eQX5OAY3jJtr1P9HM5jalMIXyhz6f0jykggvUJ+bfBtlYfHtlvCCN uBRVoWCVVF9O2U0U3QpRs+t5kYhVXeEPqaY6nPQqiNGTl8s0nzNa0VaswDwghGp0ZQ hPyygVZqVJtBkLJ7YnyoXWAVolS6MtxRN3ORxfvOowRm4o1mctO6IEqYUEOdFNXUqw kJF12GbrrvZFA== Received: from [192.168.1.26] (mr38p00im-dlb-asmtp-mailmevip.me.com [17.57.152.18]) by mr85p00im-ztdg06011201.me.com (Postfix) with ESMTPSA id 3EE7996020B; Wed, 18 Dec 2024 00:02:31 +0000 (UTC) From: Zijun Hu Date: Wed, 18 Dec 2024 08:01:33 +0800 Subject: [PATCH v4 3/8] driver core: Move true expression out of if condition in 3 device finding APIs Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241218-class_fix-v4-3-3c40f098356b@quicinc.com> References: <20241218-class_fix-v4-0-3c40f098356b@quicinc.com> In-Reply-To: <20241218-class_fix-v4-0-3c40f098356b@quicinc.com> To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Tejun Heo , Josef Bacik , Jens Axboe , Boris Burkov , Davidlohr Bueso , Jonathan Cameron , Dave Jiang , Alison Schofield , Vishal Verma , Ira Weiny , Dan Williams Cc: Zijun Hu , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-block@vger.kernel.org, linux-cxl@vger.kernel.org, Zijun Hu , Fan Ni , Jonathan Cameron X-Mailer: b4 0.14.2 X-Proofpoint-ORIG-GUID: CDH0732C4YUMOuSX6q14K8VHFeZp09I8 X-Proofpoint-GUID: CDH0732C4YUMOuSX6q14K8VHFeZp09I8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2024-12-17_12,2024-12-17_03,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 suspectscore=0 malwarescore=0 adultscore=0 bulkscore=0 clxscore=1015 spamscore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2308100000 definitions=main-2412170183 X-Apple-Remote-Links: v=1;h=KCk=;charset=UTF-8 From: Zijun Hu For bus_find_device(), driver_find_device(), and device_find_child(), all of their function body have pattern below: { struct klist_iter i; struct device *dev; ... while ((dev = next_device(&i))) if (match(dev, data) && get_device(dev)) break; ... } The expression 'get_device(dev)' in the if condition always returns true since @dev != NULL. Move the expression to if body to make logic of these APIs more clearer. Reviewed-by: Fan Ni Reviewed-by: Jonathan Cameron Signed-off-by: Zijun Hu --- drivers/base/bus.c | 7 +++++-- drivers/base/core.c | 7 +++++-- drivers/base/driver.c | 7 +++++-- 3 files changed, 15 insertions(+), 6 deletions(-) diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 657c93c38b0dc2a2247e5f482fadd3a9376a58e8..73a56f376d3a05962ce0931a2fe8b4d8839157f2 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -402,9 +402,12 @@ struct device *bus_find_device(const struct bus_type *bus, klist_iter_init_node(&sp->klist_devices, &i, (start ? &start->p->knode_bus : NULL)); - while ((dev = next_device(&i))) - if (match(dev, data) && get_device(dev)) + while ((dev = next_device(&i))) { + if (match(dev, data)) { + get_device(dev); break; + } + } klist_iter_exit(&i); subsys_put(sp); return dev; diff --git a/drivers/base/core.c b/drivers/base/core.c index 8bdbc9e657e832a063542391426f570ccb5c18b9..69bb6bf4bd12395226ee3c99e2f63d15c7e342a5 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -4089,9 +4089,12 @@ struct device *device_find_child(struct device *parent, const void *data, return NULL; klist_iter_init(&parent->p->klist_children, &i); - while ((child = next_device(&i))) - if (match(child, data) && get_device(child)) + while ((child = next_device(&i))) { + if (match(child, data)) { + get_device(child); break; + } + } klist_iter_exit(&i); return child; } diff --git a/drivers/base/driver.c b/drivers/base/driver.c index b4eb5b89c4ee7bc35458fc75730b16a6d1e804d3..6f033a741aa7ce6138d1c61e49e72b2a3eb85e06 100644 --- a/drivers/base/driver.c +++ b/drivers/base/driver.c @@ -160,9 +160,12 @@ struct device *driver_find_device(const struct device_driver *drv, klist_iter_init_node(&drv->p->klist_devices, &i, (start ? &start->p->knode_driver : NULL)); - while ((dev = next_device(&i))) - if (match(dev, data) && get_device(dev)) + while ((dev = next_device(&i))) { + if (match(dev, data)) { + get_device(dev); break; + } + } klist_iter_exit(&i); return dev; }