linux-kernel - Re: [PATCH v7 1/5] net: wan: Add support for QMC HDLC

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Date: Thu, 14 Mar 2024 10:05:37 +1100
From: Michael Ellerman <mpe@...erman.id.au>
To: Herve Codina <herve.codina@...tlin.com>, Vadim Fedorenko
 <vadim.fedorenko@...ux.dev>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo
 Abeni <pabeni@...hat.com>, Herve Codina <herve.codina@...tlin.com>, Yury
 Norov <yury.norov@...il.com>, Andy Shevchenko
 <andriy.shevchenko@...ux.intel.com>, Rasmus Villemoes
 <linux@...musvillemoes.dk>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, Andrew Lunn <andrew@...n.ch>, Mark Brown
 <broonie@...nel.org>, Ratheesh Kannoth <rkannoth@...vell.com>, Christophe
 Leroy <christophe.leroy@...roup.eu>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v7 1/5] net: wan: Add support for QMC HDLC

Hi Herve,

Herve Codina <herve.codina@...tlin.com> writes:
> The QMC HDLC driver provides support for HDLC using the QMC (QUICC
> Multichannel Controller) to transfer the HDLC data.
..
>  
> diff --git a/drivers/net/wan/fsl_qmc_hdlc.c b/drivers/net/wan/fsl_qmc_hdlc.c
> new file mode 100644
> index 000000000000..5fd7ed325f5b
> --- /dev/null
> +++ b/drivers/net/wan/fsl_qmc_hdlc.c
> @@ -0,0 +1,419 @@
..
> +static int qmc_hdlc_remove(struct platform_device *pdev)
> +{
> +	struct qmc_hdlc *qmc_hdlc = platform_get_drvdata(pdev);
> +
> +	unregister_hdlc_device(qmc_hdlc->netdev);
> +	free_netdev(qmc_hdlc->netdev);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id qmc_hdlc_id_table[] = {
> +	{ .compatible = "fsl,qmc-hdlc" },
> +	{} /* sentinel */
> +};
> +MODULE_DEVICE_TABLE(of, qmc_hdlc_driver);

This breaks when building as a module (eg. ppc32_allmodconfig):

  In file included from ../include/linux/device/driver.h:21,
                   from ../include/linux/device.h:32,
                   from ../include/linux/dma-mapping.h:8,
                   from ../drivers/net/wan/fsl_qmc_hdlc.c:13:
  ../drivers/net/wan/fsl_qmc_hdlc.c:405:25: error: ‘qmc_hdlc_driver’ undeclared here (not in a function); did you mean ‘qmc_hdlc_probe’?
    405 | MODULE_DEVICE_TABLE(of, qmc_hdlc_driver);
        |                         ^~~~~~~~~~~~~~~

IIUIC it should be pointing to the table, not the driver, so:

diff --git a/drivers/net/wan/fsl_qmc_hdlc.c b/drivers/net/wan/fsl_qmc_hdlc.c
index 5fd7ed325f5b..705c3681fb92 100644
--- a/drivers/net/wan/fsl_qmc_hdlc.c
+++ b/drivers/net/wan/fsl_qmc_hdlc.c
@@ -402,7 +402,7 @@ static const struct of_device_id qmc_hdlc_id_table[] = {
        { .compatible = "fsl,qmc-hdlc" },
        {} /* sentinel */
 };
-MODULE_DEVICE_TABLE(of, qmc_hdlc_driver);
+MODULE_DEVICE_TABLE(of, qmc_hdlc_id_table);

 static struct platform_driver qmc_hdlc_driver = {
        .driver = {

Which then builds correctly.

cheers