From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 BF7D93976A8; Tue, 3 Mar 2026 20:02:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772568124; cv=none; b=qHhg0fntayIdfZRMi/sBAMvGKYGx+yaW+bOk6KOfGuFvZBWpei3mv9bLWEnMwRKlrVR14mXTof72NNZ9wSN+94tlUOj8ALIxjDk3lQPAZ1ozcdzosCV7PsayELlgAwOvAjN6jBaKOPxV2DkV5k8cZEyJEYNGqTTdiRMmM9SCPKw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772568124; c=relaxed/simple; bh=shEgcgOBYfpeEiDXbrKTQf4CKxOx+4pkYVEOFPfGFBo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=uYei+xlJeQDpSYjLsz3jQ/aleD6HBzFQGyZddM0CzNmQazR7zGsXFn1B45Odkw63PAoECSCDh1KAL0wVeIEiEC0DsAHTP7bX5qgjqv9uU3NGetG14eNpPTo5NYm4gxaouwN//+ZlfV4aSzAWN6cYNtOaIYbWCX/poUeqn2GTpEo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XRUU+ktS; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XRUU+ktS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8179DC116C6; Tue, 3 Mar 2026 20:02:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772568124; bh=shEgcgOBYfpeEiDXbrKTQf4CKxOx+4pkYVEOFPfGFBo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=XRUU+ktS1UKqkYC+4C+35UICPjC0TdTngmV3lCzPA2xpggqpjkVXy2cNwqVmbxUpO vrSfxgHfnEM5zeAQjXJjTMA0+pwqwW/BgpJltjIMsz8ngt0DyI/rx5FJlZEs0UmNdk d4PKkN4oiCiRbtTSOlrlZAQVKkaDx1py4huMFjecJFUEEnZOZgpWyTX+x8nDlv9c6U JzKi5RVjjMrBX7DgDlF6ACC7bCIbGdI02duZCVhe2BeFiFx29eowsOGmSyMFOlf/jp AIXrZcUOmGkqXW0sABmOvjO0a4O3c5ao6qZJWsq6F9pWBddG/8khfXrpq9oKY7EmTk vRInyonxGfewg== Date: Tue, 3 Mar 2026 13:02:01 -0700 From: Keith Busch To: Niklas Schnelle Cc: Lukas Wunner , "Ionut Nechita (Wind River)" , linux-pci@vger.kernel.org, helgaas@kernel.org, sebott@linux.ibm.com, bblock@linux.ibm.com, alifm@linux.ibm.com, julianr@linux.ibm.com, dtatulea@nvidia.com, mani@kernel.org, ionut_n2001@yahoo.com, sunlightlinux@gmail.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5 1/1] PCI/IOV: Add reentrant locking in sriov_add_vfs/sriov_del_vfs for complete serialization Message-ID: References: <20260303080903.28693-1-ionut.nechita@windriver.com> <20260303080903.28693-2-ionut.nechita@windriver.com> <286d0488aa72b1741f93f900fd5db5c4334a6f50.camel@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-pci@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: <286d0488aa72b1741f93f900fd5db5c4334a6f50.camel@linux.ibm.com> On Tue, Mar 03, 2026 at 08:56:24PM +0100, Niklas Schnelle wrote: > On Tue, 2026-03-03 at 20:28 +0100, Lukas Wunner wrote: > > Actually, scratch this particular comment. The deadlock in pciehp > > is actually an AB-BA deadlock, not recursive acquisition. > > Hi Lukas, > > Do you have a link to a report or a lockdep splat for this issue? https://lore.kernel.org/all/4c882e25194ba8282b78fe963fec8faae7cf23eb.1529173804.git.lukas@wunner.de/