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[2620:137:e000::1:20]) by mx.google.com with ESMTP id b13-20020a63d80d000000b0055ba5ea2de1si4120464pgh.855.2023.07.07.07.25.35; Fri, 07 Jul 2023 07:25:53 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@ibm.com header.s=pp1 header.b=P4VC7ea8; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=NONE dis=NONE) header.from=ibm.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232960AbjGGOJr (ORCPT + 99 others); Fri, 7 Jul 2023 10:09:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45704 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229625AbjGGOJe (ORCPT ); Fri, 7 Jul 2023 10:09:34 -0400 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 294592724; Fri, 7 Jul 2023 07:09:17 -0700 (PDT) Received: from pps.filterd (m0353725.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 367E5LO0030616; Fri, 7 Jul 2023 14:09:05 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=message-id : subject : from : to : cc : date : in-reply-to : references : content-type : content-transfer-encoding : mime-version; s=pp1; bh=WP+aDYQCMiQoLxOSTdmYncJ2HhDH6cvv4gluci3VNBY=; b=P4VC7ea8wugV4R+1oGl0tAgeFnwXNDwXB7q6cz7AcC5xkiFO1JtGNo65LRuISLFqBP9J PJFNj6sbyZYeQYUpZUBiBn5pBjRimNTE9iuGxRCBQf7c6Zq9SR94uchg2VFdhjaBWpNo jY2PhTzZfml3KYhj/xDw3OUuA9vjnwFX139qigYBe3av7ZxfwnhtrTBRNa+V1iHLgDBN mCJCKIL+WTANANvllQZsoYgw/qu0FB0ywSclfCz82MdDEGoPorJ+TRzjqaZPLZN2L36V cWVsR2pByG0RLtilHZI4WMT4KT9GnBnpRbnAD1xpTGRvCZ+24fv+OU/rzhDHFUZI3KPs 3A== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3rpm5h03ch-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 07 Jul 2023 14:09:05 +0000 Received: from m0353725.ppops.net (m0353725.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 367E6tD5004051; Fri, 7 Jul 2023 14:09:04 GMT Received: from ppma03ams.nl.ibm.com (62.31.33a9.ip4.static.sl-reverse.com [169.51.49.98]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3rpm5h03bh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 07 Jul 2023 14:09:04 +0000 Received: from pps.filterd (ppma03ams.nl.ibm.com [127.0.0.1]) by ppma03ams.nl.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 3677Rtuf000704; Fri, 7 Jul 2023 14:09:02 GMT Received: from smtprelay03.fra02v.mail.ibm.com ([9.218.2.224]) by ppma03ams.nl.ibm.com (PPS) with ESMTPS id 3rjbs4v1t4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 07 Jul 2023 14:09:02 +0000 Received: from smtpav03.fra02v.mail.ibm.com (smtpav03.fra02v.mail.ibm.com [10.20.54.102]) by smtprelay03.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 367E8x2w18088486 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 7 Jul 2023 14:08:59 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 16AAE2004B; Fri, 7 Jul 2023 14:08:59 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8653320040; Fri, 7 Jul 2023 14:08:58 +0000 (GMT) Received: from [9.171.85.13] (unknown [9.171.85.13]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 7 Jul 2023 14:08:58 +0000 (GMT) Message-ID: <1f6e3432f8626d8f3d2de99e7f2f51c1fdf4e58c.camel@linux.ibm.com> Subject: Re: [PATCH net v2 1/3] s390/ism: Fix locking for forwarding of IRQs and events to clients From: Niklas Schnelle To: Alexandra Winter , Paolo Abeni , Wenjia Zhang , Jan Karcher , Stefan Raspl , "David S. Miller" Cc: linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Date: Fri, 07 Jul 2023 16:08:58 +0200 In-Reply-To: <8ec43fe6-218c-189f-4a90-73e482a0c5ff@linux.ibm.com> References: <20230707105622.3332261-1-schnelle@linux.ibm.com> <20230707105622.3332261-2-schnelle@linux.ibm.com> <8ec43fe6-218c-189f-4a90-73e482a0c5ff@linux.ibm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.48.4 (3.48.4-1.fc38) MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: xWMWUQAhh9Zpub-YQrgtSRWEpABfv7YL X-Proofpoint-GUID: VUM-j-B8HsF6V94jRfKi7eRS1zEG34ns X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-07_09,2023-07-06_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 mlxlogscore=999 priorityscore=1501 impostorscore=0 phishscore=0 clxscore=1015 spamscore=0 suspectscore=0 mlxscore=0 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2307070130 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2023-07-07 at 15:37 +0200, Alexandra Winter wrote: >=20 > On 07.07.23 12:56, Niklas Schnelle wrote: > [...] > > Instead of expanding the use of the clients_lock further add a separate > > array in struct ism_dev which references clients subscribed to the > > device's events and IRQs. This array is protected by ism->lock which is > > already taken in ism_handle_irq() and can be taken outside the IRQ > > handler when adding/removing subscribers or the accessing >=20 > typo? s/the accessing/accessing the/g >=20 > > ism->sba_client_arr[]. This also means that the clients_lock is no > > longer taken in IRQ context. > >=20 >=20 > [...] >=20 > > @@ -554,6 +577,7 @@ static void ism_dev_add_work_func(struct work_struc= t *work) > > add_work); > > =20 > > client->add(client->tgt_ism); > > + ism_setup_forwarding(client, client->tgt_ism); > > atomic_dec(&client->tgt_ism->add_dev_cnt); > > wake_up(&client->tgt_ism->waitq); > > } > > @@ -691,7 +715,11 @@ static void ism_dev_remove_work_func(struct work_s= truct *work) > > { > > struct ism_client *client =3D container_of(work, struct ism_client, > > remove_work); > > + unsigned long flags; > > =20 > > + spin_lock_irqsave(&client->tgt_ism->lock, flags); > > + client->tgt_ism->subs[client->id] =3D NULL; > > + spin_unlock_irqrestore(&client->tgt_ism->lock, flags); > > client->remove(client->tgt_ism); > > atomic_dec(&client->tgt_ism->free_clients_cnt); > > wake_up(&client->tgt_ism->waitq); >=20 > I am not sure I like the new split. here you fix ism_dev_add_work_func() = and ism_dev_remove_work_func(), > that you remove in the next patch. But looks functionally ok to me. >=20 >=20 > Reviewed-by: Alexandra Winter Thanks for your review. Yeah it's the price we pay for working intermediate states. I think if you hadn't already invested the time to look at the conmbined patch it might still be easier to review the split patches.