From nobody Thu Dec 18 07:12:21 2025 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (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 1AEF37E0ED for ; Fri, 14 Mar 2025 05:46:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741931190; cv=none; b=KD/PbIGte5dMHry9n06PyMDzryLr/sneA+UtoUbPDmBhCmHF/iDjL9r74NJH0Fnkxag+DSybQ3fUkEAxQ+biK/Na4wxOjLlSr2GbSDVkj0i3Njw7iBaymsDzaVGg1QG5KuxqMMk6/MHt7RlnECLG3yWGMjzt0P1vE03N5V+WwqY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741931190; c=relaxed/simple; bh=JfkqTO4XQAFJC3G9pkhdVDCoq+KaJL7gqWaGsD8ehVc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=csVZ7bukaetoiWjR+phIYOxGhAFeP3gKFNVU6NOSXClb9q4kvJ1zH52Gs4oRmZegbjC2FJcZia9zxYZyzlq7iV1mw4VgxKmAgniGnEYd/Szq4nG2G/aEuDlQB/6HlDW4J4PGEAckxggAj5P8s6ONi6wemYKHDbh+nukhy4sMsX0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=RLZFBQDo; arc=none smtp.client-ip=148.163.156.1 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="RLZFBQDo" Received: from pps.filterd (m0353729.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 52DNP6oG030794; Fri, 14 Mar 2025 05:46:13 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=XxU5XP2xQsKie4KRP nlKDhPgga75rXA+r7mJnNP2BIg=; b=RLZFBQDoalag5e52aYMwO2wI6p2VeWEEd vNh7pCFGhr99sxv9kkeDmpI3CMCI7c0ykWU7uh1gLDCyHbVGPbtHmKQVJsC4UQRN JBHfcBdu/paCRr2yaIe6nczjkFh+/bsqslsy8F3juMu7ak/G4ozK89LVPBo8l5PB 3IuLMM1sQjdCxAHfK+B8CzIgHhU+7XKrdExLswgDFO7hisG22aJYLJny6sx1uU8X qwqEEcVcj0B35FZ+1exbguKx33PQlLTHxdJ7Jvldv0uGj4omoVpCJ+2QLNQBCb+8 l9Q28NoAFjYsJKl7B2b+w+IOzdq5ygJA71wWm/FAlCwBL7gvPYZmA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 45byd8vf8f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 14 Mar 2025 05:46:12 +0000 (GMT) Received: from m0353729.ppops.net (m0353729.ppops.net [127.0.0.1]) by pps.reinject (8.18.0.8/8.18.0.8) with ESMTP id 52E5kCqP031459; Fri, 14 Mar 2025 05:46:12 GMT Received: from ppma13.dal12v.mail.ibm.com (dd.9e.1632.ip4.static.sl-reverse.com [50.22.158.221]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 45byd8vf8b-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 14 Mar 2025 05:46:12 +0000 (GMT) Received: from pps.filterd (ppma13.dal12v.mail.ibm.com [127.0.0.1]) by ppma13.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 52E3Yt6G026010; Fri, 14 Mar 2025 05:46:11 GMT Received: from smtprelay07.fra02v.mail.ibm.com ([9.218.2.229]) by ppma13.dal12v.mail.ibm.com (PPS) with ESMTPS id 45atspnfed-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 14 Mar 2025 05:46:11 +0000 Received: from smtpav03.fra02v.mail.ibm.com (smtpav03.fra02v.mail.ibm.com [10.20.54.102]) by smtprelay07.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 52E5k7JG43057504 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 14 Mar 2025 05:46:08 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D09E120040; Fri, 14 Mar 2025 05:46:07 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7DAB12004B; Fri, 14 Mar 2025 05:46:04 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com.com (unknown [9.39.22.126]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 14 Mar 2025 05:46:04 +0000 (GMT) From: Shrikanth Hegde To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org Cc: sshegde@linux.ibm.com, npiggin@gmail.com, christophe.leroy@csgroup.eu, mpe@ellerman.id.au, peterz@infradead.org, fbarrat@linux.ibm.com, ajd@linux.ibm.com, mahesh@linux.ibm.com, oohall@gmail.com, hbathini@linux.ibm.com, dhowells@redhat.com, haren@linux.ibm.com, linux-kernel@vger.kernel.org Subject: [PATCH 1/6] powerpc: eeh: use lock guard for mutex Date: Fri, 14 Mar 2025 11:15:39 +0530 Message-ID: <20250314054544.1998928-2-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250314054544.1998928-1-sshegde@linux.ibm.com> References: <20250314054544.1998928-1-sshegde@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: gI0BauemxDdfq9atzbIq9HRczMRkM8KE X-Proofpoint-ORIG-GUID: l4a9ydR15iQ03wLKOtFxoTMspxWvenl8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-14_01,2025-03-13_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 spamscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 bulkscore=0 phishscore=0 lowpriorityscore=0 suspectscore=0 mlxlogscore=804 clxscore=1015 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2503140041 Content-Type: text/plain; charset="utf-8" use guard(mutex) for scope based resource management of mutex. This would make the code simpler and easier to maintain. More details on lock guards can be found at https://lore.kernel.org/all/20230612093537.614161713@infradead.org/T/#u Signed-off-by: Shrikanth Hegde --- arch/powerpc/kernel/eeh.c | 20 +++++++------------- 1 file changed, 7 insertions(+), 13 deletions(-) diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c index 83fe99861eb1..929474c0ec77 100644 --- a/arch/powerpc/kernel/eeh.c +++ b/arch/powerpc/kernel/eeh.c @@ -1208,16 +1208,16 @@ int eeh_dev_open(struct pci_dev *pdev) struct eeh_dev *edev; int ret =3D -ENODEV; =20 - mutex_lock(&eeh_dev_mutex); + guard(mutex)(&eeh_dev_mutex); =20 /* No PCI device ? */ if (!pdev) - goto out; + return ret; =20 /* No EEH device or PE ? */ edev =3D pci_dev_to_eeh_dev(pdev); if (!edev || !edev->pe) - goto out; + return ret; =20 /* * The PE might have been put into frozen state, but we @@ -1227,16 +1227,12 @@ int eeh_dev_open(struct pci_dev *pdev) */ ret =3D eeh_pe_change_owner(edev->pe); if (ret) - goto out; + return ret; =20 /* Increase PE's pass through count */ atomic_inc(&edev->pe->pass_dev_cnt); - mutex_unlock(&eeh_dev_mutex); =20 return 0; -out: - mutex_unlock(&eeh_dev_mutex); - return ret; } EXPORT_SYMBOL_GPL(eeh_dev_open); =20 @@ -1252,22 +1248,20 @@ void eeh_dev_release(struct pci_dev *pdev) { struct eeh_dev *edev; =20 - mutex_lock(&eeh_dev_mutex); + guard(mutex)(&eeh_dev_mutex); =20 /* No PCI device ? */ if (!pdev) - goto out; + return; =20 /* No EEH device ? */ edev =3D pci_dev_to_eeh_dev(pdev); if (!edev || !edev->pe || !eeh_pe_passed(edev->pe)) - goto out; + return; =20 /* Decrease PE's pass through count */ WARN_ON(atomic_dec_if_positive(&edev->pe->pass_dev_cnt) < 0); eeh_pe_change_owner(edev->pe); -out: - mutex_unlock(&eeh_dev_mutex); } EXPORT_SYMBOL(eeh_dev_release); =20 --=20 2.39.3