linux-kernel - Re: [PATCH v2] 8250_pci.c: Update NI specific devices class to multi serial

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Message-ID: <20190115133118.GA31202@infradead.org>
Date:   Tue, 15 Jan 2019 05:31:18 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Guan Yung Tseng <guan.yung.tseng@...com>
Cc:     gregkh@...uxfoundation.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] 8250_pci.c: Update NI specific devices class to multi
 serial

On Tue, Jan 15, 2019 at 06:10:05PM +0800, Guan Yung Tseng wrote:
> +/*
> + * NI Serial devices incorrectly identify themselves
> + * PCI_CLASS_COMMUNICATION_OTHER, instead of what
> + * they really are: PCI_CLASS_COMMUNICATION_MULTISERIAL
> + */
> +static int pci_ni_probe(struct pci_dev *dev)
> +{
> +	dev->class = PCI_CLASS_COMMUNICATION_MULTISERIAL << 8 |
> +			(dev->class & 0xff);
> +	return 0;
> +}

This looks odd.  dev->class should just contain the class code read from
config space.  I think you need to work around this in the places that
check the classcode instead and add a quirk for these devices.