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 B574A353EFC for ; Sat, 7 Feb 2026 15:20:06 +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=1770477606; cv=none; b=AJdkJjnyXW7ojadHXCOJ/g6+VrCmy5cO4VVAeUubNHKRSsbpjhemV31H79z9BI+si9XYv7qfKMAlm0jfg64OZuQyk2/I6TdYtUFXVHYtFcsPmlESKVJ3CDrEIWVgDpuJx5HNZL6jjwX28rTyb4FaoiitKBhXgaFF+YeBIDBnT/0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770477606; c=relaxed/simple; bh=HLYa3bR2tSJY7gYFYH4dnDdR19fb/P3rdmm6PLjWmMo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ONjSz5rbMbD4ZkTTWmLkeT9rpT+QTVlEjLRSyjgTKHyrvXX1a9lSt9NqnIkQtopVCmVj3yK7VDkCrF80GC9K6jVQJVxXPPhtgZA2QJiS/+Tq5EKUvFVLbph9YzBNNIdgEi/KhNdbaPcYlICXWGz0aMZ4mryxVB1Iy7W9iTSpiyU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=fpAsRXY1; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="fpAsRXY1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1DB9C116D0; Sat, 7 Feb 2026 15:20:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1770477606; bh=HLYa3bR2tSJY7gYFYH4dnDdR19fb/P3rdmm6PLjWmMo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=fpAsRXY1XbjWbnsMQu19nGubDktnaQVvvdz7hBtDmu++haSmSM9hwjIyc7hePUbC+ DC6pyDg6CIAzhy5vZJlKZ2vCllIMQNQeWhRqif3220+Oaic5OHe7yGlr23oGTi5IIe nQSCwCJFmC/F8JyP4zJ6UXqomZUtV0eOthXBr10k= Date: Sat, 7 Feb 2026 16:20:03 +0100 From: Greg KH To: Mario Limonciello Cc: "stable@vger.kernel.org" , "Kovacs, Alexander" , "Pananchikkal, Renjith" Subject: Re: [6.18.y] Fixes for USB4/NVME hotplugging Message-ID: <2026020755-stuck-rinse-89ff@gregkh> References: <48e48a86-f88a-49e3-a9a0-29f8f43175cf@amd.com> Precedence: bulk X-Mailing-List: stable@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: <48e48a86-f88a-49e3-a9a0-29f8f43175cf@amd.com> On Wed, Feb 04, 2026 at 02:06:15PM -0600, Mario Limonciello wrote: > Hi, > > Some of my colleagues (on CC) have been chasing an issue where some > percentage of the time USB4 NVME enclosures weren't working properly on > hotplug. They narrowed down the PCIe traces and found that it was caused by > a race condition between multiple drivers shortly after link training. > > This issue traces back a while, they reproduced it as far back as 6.14, but > that's mostly because the hardware it was first reproduced on had graphics > enabled in 6.14. Given the root cause, I strongly hardware enabled with > earlier kernels would also reproduce it. Nonetheless the issue has actually > already been fixed though by a series that went into 6.19. > > commit a2f1e22390ac ("PCI/ERR: Ensure error recoverability at all times") > commit 383d89699c50 ("treewide: Drop pci_save_state() after > pci_restore_state()") > > Can we bring this back to 6.18.y too? > > If any questions about the methodology or details, they can add more. Now queued up, thanks. greg k-h