From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qk1-f171.google.com (mail-qk1-f171.google.com [209.85.222.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 270EA2E7F0D for ; Tue, 7 Oct 2025 16:21:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.222.171 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759854079; cv=none; b=G6gOAP2u50eC8XUl9kxGCOwq9m6BJCBRxhCG9pahv/S56M2/oLvCQ7HKRsMOWCuXV71kBtm8Ps9asrsy4g6ByXhJnZD+J2Yiz1oJxajeYy2lUXVGIdymWom1nzUN8i3rW7FBOCN6vM3uMRIaXjQvGebjxB+vvBiVAuILS5Vt26Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759854079; c=relaxed/simple; bh=rUj4e7mW96AJXx7tHHanond6R8M9cTYxkixXGkn/ZsY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=lF1+vNIOBniWZVn2RqxUtUfoinrF8udxQ0j2o21mobyVfKdF28joW0g5rIhrs+estmgRKW3Dg1q1h6O8j2VTlfKmKT9BuCoem2spd8mK43JQq0VRRWflqWXZMtuuJKCX+t7GTR93eamFJ4KGjQYt0LjZ/BvUD4OJZR/sWB1pbD0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca; spf=pass smtp.mailfrom=ziepe.ca; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b=gYtJcW2m; arc=none smtp.client-ip=209.85.222.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="gYtJcW2m" Received: by mail-qk1-f171.google.com with SMTP id af79cd13be357-854585036e8so668617485a.1 for ; Tue, 07 Oct 2025 09:21:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; t=1759854073; x=1760458873; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=nG7dBmqQ7oC7V9KJ7eaX85jqj65+GaLqPAyJt86l2UE=; b=gYtJcW2mx3N37KZa7zBTQNLno+q9ti46KzWNXwNLcmj90jHk6WIDmBEELERQGJ/Dk8 e1Xtf6UFxXjkO92uGPc6l/1u/NJlK7sQbWwxhnhBFSGXz1hhR9mQEovkfGufJq8FyBn2 BCuRF+gLqLEruO8xKMBJuwe9jEblze6wr8szxPK7lX33G3OOL6+KIeozdfUGULYJnGtI fI+F6Au4dpfa0KfKUaVhjFegApmp+V4k8L4j85J3UVtmyokprrsjl0mh1vh1vgE0VKQC fYFt6MIicyOm3vqpT28dl6xP69UiHpHADpOrdmIP85f9jwl0Fj6FGnvEGLxqB4U4kOUO GcSg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759854073; x=1760458873; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=nG7dBmqQ7oC7V9KJ7eaX85jqj65+GaLqPAyJt86l2UE=; b=E7lgFbhCiW5TBIRlJZyDt9MAEuTQj+5H6Yfh1mlk70SP73aSuXPjSHOjJZuYygbMXu QA8FTM/rJ1Frh4/SII/bhI1ObTL/r4CFZAlFYi49sq2Jjs/xfpqq2dD4oScypKLSnPOd PimScU5qEZjS3uh6dfrPtQBmCuHPVMregdMflMG+eh3WhJKYxhzm69xHiGbJLbq15C14 uf+1wRoyZeOKoW9II+mxJHWcZ6yVZSkWjgi+uqM2lQ88QMSZSKekNS+DZx6k5AAR4Nhq OTweT1iyQuP/31OsnZnhFeiW+4lC2i3EBnvuYJOekxU1pPS3ukR9ZlxlWdJJ+y3aIgEO iFtA== X-Forwarded-Encrypted: i=1; AJvYcCUmPAqHfmNHFSfQKj+YCEFins+wOlwYmWOGKuoncNUPbz+Ks7NY8tqSCAgfEQTkz6az4XESSyXMZysS@vger.kernel.org X-Gm-Message-State: AOJu0YwJ+pE5XTqcBt7wK8OWr2NJ7OFNJ29hJHn0BVKkxYknY/sMDnFA TYx34s0IKeUOiz1VGAbj6kevbFtu1C5QcRgHCp6v4I1zOAnNdRSnfWM/eUdl2ZAY2kA= X-Gm-Gg: ASbGncv6NP6cn8xO9Xp23GhZ3RPtZ26+llD7lGEIMSegiKQBNtp6/Ikp0B5tcjSf5QF Nkd0xq3+SLG4qMYuxMG7Y2KRi8Em/8IFN6PufNHFO74T1T+2p2+o/ghKN+u+RUOlWM94oKYMUjH xQGLqzVfL/ij8d1jJrSsLG/HKSQ3HBOfRaCKQbYEkl8C8PgNzZbno4oCNif6IZborGoQ0XZR3my w3C5IixW4vh7cH7gQBFqQwWFHRQhw/KqRD1m3quBENlkwNaJ3OGbCFlbo5T9U2ZG/AVkkYOqX9X pMQg4kvqASG8tRcEi6b//r0igFWkPQWZQGftDQG32uhDDWp8VlgzxD3ySH9PkPdwHnR97X7sIde dtOIE0lEvQV93h9bjqVeIgrS1BY+miRekvTsk6SEbIQQ0bKSsYvfD9wq2llAp1e1q3mooDdHXiM dA/gubixn6/rjbRmoF X-Google-Smtp-Source: AGHT+IGIL2y2zEPuHipwkl4TUjLIYPddwo9T+ngD6WTBuoJAHtLmSJLiAwgUmeLquPIwJcA51YE2Rw== X-Received: by 2002:a05:620a:7085:b0:858:f75a:c922 with SMTP id af79cd13be357-883502b7b36mr60557285a.6.1759854072907; Tue, 07 Oct 2025 09:21:12 -0700 (PDT) Received: from ziepe.ca (hlfxns017vw-47-55-120-4.dhcp-dynamic.fibreop.ns.bellaliant.net. [47.55.120.4]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8777a7e02e7sm1561434385a.62.2025.10.07.09.21.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Oct 2025 09:21:12 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1v6AR5-0000000Feae-1YWw; Tue, 07 Oct 2025 13:21:11 -0300 Date: Tue, 7 Oct 2025 13:21:11 -0300 From: Jason Gunthorpe To: Gerd Bayer Cc: Tariq Toukan , Saeed Mahameed , Leon Romanovsky , Shay Drori , Mark Bloch , Andrew Lunn , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alex Vesker , Feras Daoud , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, Niklas Schnelle , linux-s390@vger.kernel.org Subject: Re: [PATCH net v2] net/mlx5: Avoid deadlock between PCI error recovery and health reporter Message-ID: <20251007162111.GA3604844@ziepe.ca> References: <20251007144826.2825134-1-gbayer@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251007144826.2825134-1-gbayer@linux.ibm.com> On Tue, Oct 07, 2025 at 04:48:26PM +0200, Gerd Bayer wrote: > - task: kmcheck > mlx5_unload_one() tries to acquire devlink lock while the PCI error > recovery code has set pdev->block_cfg_access by way of > pci_cfg_access_lock() This seems wrong, arch code shouldn't invoke the driver's error handler while hodling pci_dev_lock(). Or at least if we do want to do this the locking should be documented and some lockdep map should be added to pci_cfg_access_lock() and the normal AER path.. Jason