linux-kernel - Re: [PATCH 03/10] spi: spi-mem: Add driver for Aspeed SMC controllers

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Message-ID: <76c3f352-a0fc-f72f-e66e-594f9249cb8c@kaod.org>
Date:   Tue, 15 Feb 2022 10:07:51 +0100
From:   Cédric Le Goater <clg@...d.org>
To:     Lukas Wunner <lukas@...ner.de>
CC:     <linux-spi@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
        Mark Brown <broonie@...nel.org>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Pratyush Yadav <p.yadav@...com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        <linux-aspeed@...ts.ozlabs.org>, Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Chin-Ting Kuo <chin-ting_kuo@...eedtech.com>,
        <devicetree@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/10] spi: spi-mem: Add driver for Aspeed SMC controllers

Hello Lukas,

On 2/15/22 07:27, Lukas Wunner wrote:
> On Mon, Feb 14, 2022 at 10:42:24AM +0100, Cédric Le Goater wrote:
>> +static int aspeed_spi_probe(struct platform_device *pdev)
>> +{
> [...]
>> +	ctlr = spi_alloc_master(dev, sizeof(*aspi));
>> +	if (!ctlr)
>> +		return -ENOMEM;
> 
> Use devm_spi_alloc_master() and remove the "put_controller" error path
> for simplicity.
  
yes.

>> +	ret = devm_spi_register_controller(dev, ctlr);
> [...]
>> +static int aspeed_spi_remove(struct platform_device *pdev)
>> +{
>> +	struct spi_controller *ctlr = platform_get_drvdata(pdev);
>> +	struct aspeed_spi *aspi = spi_controller_get_devdata(ctlr);
>> +
>> +	aspeed_spi_enable(aspi, false);
>> +	spi_unregister_controller(ctlr);
>> +	clk_disable_unprepare(aspi->clk);
>> +	return 0;
>> +}
> 
> You need to move the call to spi_unregister_controller() *before*
> the call to aspeed_spi_enable().  The controller must be fully
> operational until spi_unregister_controller() returns.
> 
> You also need to replace the call to devm_spi_register_controller()
> in aspeed_spi_probe() with spi_register_controller().
> Otherwise you'll unregister the controller twice because you're
> calling spi_unregister_controller() in aspeed_spi_remove().

ok. Understood. Done in v2.

Thanks,

C.