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

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Date:   Mon, 5 Dec 2022 17:26:00 +0100
From:   Lorenzo Pieralisi <lpieralisi@...nel.org>
To:     John Thomson <git@...nthomson.fastmail.com.au>
Cc:     Sergio Paracuellos <sergio.paracuellos@...il.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arınç ÜNAL <arinc.unal@...nc9.com>,
        linux-phy@...ts.infradead.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] PCI: mt7621: add sentinel to quirks table

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@...nthomson.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
>