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Date: Thu, 16 Apr 2026 16:11:53 -0600
From: Keith Busch <kbusch@kernel.org>
To: Tao Jiang <tanroame.kyle@gmail.com>
Cc: linux-nvme@lists.infradead.org, axboe@kernel.dk, hch@lst.de,
	sagi@grimberg.me, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] nvme-pci: add quirk for Memblaze Pblaze5 (0x1c5f:0x0555)
Message-ID: <aeFeqc0poJuRPK-y@kbusch-mbp>
References: <1776274035-1604-1-git-send-email-tanroame.kyle@gmail.com>
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In-Reply-To: <1776274035-1604-1-git-send-email-tanroame.kyle@gmail.com>

On Thu, Apr 16, 2026 at 01:27:15AM +0800, Tao Jiang wrote:
> The Memblaze Pblaze5 NVMe device (PCI ID 0x1c5f:0x0555)
> is detected as a controller on recent kernels (tested on 5.15.85
> and 6.8.4), but no namespace is exposed.
> 
> Tools like lsblk and fdisk do not report any block device.
> 
> dmesg shows:
>   nvme nvme0: missing or invalid SUBNQN field.
> 
> The device works correctly on older kernels (e.g. 4.19), suggesting
> a compatibility issue with newer namespace handling.
> 
> This indicates the device does not properly support the
> Namespace Descriptor List feature.
> 
> Applying NVME_QUIRK_NO_NS_DESC_LIST allows the namespace to be
> discovered correctly.

Thanks, applied to nvme-7.1.