[{"id":3680654,"web_url":"http://patchwork.ozlabs.org/comment/3680654/","msgid":"<20260422143114.GD2707369@p1gen4-pw042f0m>","list_archive_url":null,"date":"2026-04-22T14:31:14","subject":"Re: [PATCH v3 3/3] s390/pci: Fix circular/recursive deadlocks in\n PCI-bus and -device release","submitter":{"id":91674,"url":"http://patchwork.ozlabs.org/api/people/91674/","name":"Benjamin Block","email":"bblock@linux.ibm.com"},"content":"On Wed, Apr 22, 2026 at 04:22:13PM +0200, Benjamin Block wrote:\n> When removing PCI device or PCI bus objects there are a couple of\n> call-chains where it is possible that the kernel runs into a circular\n> deadlock involving the central `pci_rescan_remove_lock`.\n> \n--8<--\n> \n> Fixes: 05bc1be6db4b2 (\"s390/pci: create zPCI bus\")\n> Fixes: ab909509850b2 (\"PCI: s390: Fix use-after-free of PCI resources with per-function hotplug\")\n> Reviewed-by: Niklas Schnelle \n> Tested-by: Niklas Schnelle \n> Signed-off-by: Benjamin Block \n> Reference-ID: JUP1193979\n\nAh, damn. This `Reference-ID` wasn't meant to be in the \"final\" email. Sorry.\nI'll re-send without it.","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=ZHPnn/l4;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.105.105.114; helo=tor.lore.kernel.org;\n envelope-from=linux-pci+bounces-52978-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com\n header.b=\"ZHPnn/l4\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=148.163.156.1","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=linux.ibm.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=linux.ibm.com"],"Received":["from tor.lore.kernel.org (tor.lore.kernel.org [172.105.105.114])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g11qx4mM1z1y2d\n\tfor ; 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a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc\n\t:content-transfer-encoding:content-type:date:from:in-reply-to\n\t:message-id:mime-version:references:sender:subject:to; s=pp1;\n\t bh=wc5xyRzLMgKaTWJhLQUu6Av9od0cCpXKLmDnSF8zkrs=; b=ZHPnn/l4QTGL\n\tmsQ/H9O8twR4iULcL+PHfwHwkJgq7+5QjINxiUfxWjayrLBAgXui5FsAIFY//INL\n\tXciWgdsPjpKmNKHzBkZVQSCcxjWpLAFUjj15o3lmq2+Eo1EKI4XZ7WSqojnblTTr\n\tJ+nXFNRN/pkEsgolu+2SAyZGFBM/j1Mca1VmwCzPp/HHTeLnXlq1dQvpEFaijK5+\n\t4WI75RNOIwlB3MIiS76uskTPFSzPkviyngecghMUc6v0pLn9NihqmW8jJJdKfvTO\n\t/ZxHgCH77ni6vMUvB0aJVLdMvcMUJZcA3cmn0HviYC80eUNClR4QG6NS9EAhSMnu\n\tJgDdtIQwjg==","Date":"Wed, 22 Apr 2026 16:31:14 +0200","From":"Benjamin Block ","To":"Bjorn Helgaas ","Cc":"Ionut Nechita ,\n Tobias Schumacher ,\n linux-pci ,\n Gerd Bayer , Vasily Gorbik ,\n Christian Borntraeger ,\n Niklas Schnelle ,\n Sven Schnelle ,\n linux-kernel ,\n Ionut Nechita ,\n Heiko Carstens , Farhan Ali ,\n linux-s390 ,\n Alexander Gordeev ,\n Andreas Krebbel ,\n Matthew Rosato ,\n Julian Ruess ","Subject":"Re: [PATCH v3 3/3] s390/pci: Fix circular/recursive deadlocks in\n PCI-bus and -device release","Message-ID":"<20260422143114.GD2707369@p1gen4-pw042f0m>","References":"\n ","Precedence":"bulk","X-Mailing-List":"linux-pci@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; 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