Re: [PATCH 2/2] PCI: mt7621: add sentinel to quirks table

From: Lorenzo Pieralisi <lpieralisi@kernel.org>
To: John Thomson <git@johnthomson.fastmail.com.au>
Cc: "Sergio Paracuellos" <sergio.paracuellos@gmail.com>,
	"Kishon Vijay Abraham I" <kishon@ti.com>,
	"Vinod Koul" <vkoul@kernel.org>, "Rob Herring" <robh@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Arınç ÜNAL" <arinc.unal@arinc9.com>,
	linux-phy@lists.infradead.org, linux-pci@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] PCI: mt7621: add sentinel to quirks table
Date: Mon, 5 Dec 2022 17:26:00 +0100	[thread overview]
Message-ID: <Y44bmGfgEJNd8VhK@lpieralisi> (raw)
In-Reply-To: <20221104205242.3440388-3-git@johnthomson.fastmail.com.au>

Always capitalize the sentence in the subject.

"PCI: mt7621: Add sentinel to quirks table"

On Sat, Nov 05, 2022 at 06:52:42AM +1000, John Thomson wrote:
> With mt7621 soc_dev_attr fixed to register the soc as a device,
> kernel will experience an oops in soc_device_match_attr

Can we reword this please ? What you are describing *exposes* the
bug but it is not describing the bug per-se.

The bug is related to a missing sentinel in the struct
soc_device_attribute array and that's true regardless of whether it is
actually triggered or not.

Please update the commit log promptly and I shall send it upstream.

Thanks,
Lorenzo

> This quirk test was introduced in the staging driver in
> commit b483b4e4d3f6 ("staging: mt7621-pci: add quirks for 'E2' revision
> using 'soc_device_attribute'"), and the staging driver was moved in
> commit 2bdd5238e756 ("PCI: mt7621: Add MediaTek MT7621 PCIe host
> controller driver") for the 5.16 kernel
> 
> Link: https://lore.kernel.org/lkml/26ebbed1-0fe9-4af9-8466-65f841d0b382@app.fastmail.com
> Fixes: b483b4e4d3f6 ("staging: mt7621-pci: add quirks for 'E2' revision
> using 'soc_device_attribute'")
> Signed-off-by: John Thomson <git@johnthomson.fastmail.com.au>
> ---
>  drivers/pci/controller/pcie-mt7621.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pcie-mt7621.c b/drivers/pci/controller/pcie-mt7621.c
> index 4bd1abf26008..ee7aad09d627 100644
> --- a/drivers/pci/controller/pcie-mt7621.c
> +++ b/drivers/pci/controller/pcie-mt7621.c
> @@ -466,7 +466,8 @@ static int mt7621_pcie_register_host(struct pci_host_bridge *host)
>  }
>  
>  static const struct soc_device_attribute mt7621_pcie_quirks_match[] = {
> -	{ .soc_id = "mt7621", .revision = "E2" }
> +	{ .soc_id = "mt7621", .revision = "E2" },
> +	{ /* sentinel */ }
>  };
>  
>  static int mt7621_pcie_probe(struct platform_device *pdev)
> -- 
> 2.37.2
> 