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Message-ID: <76c3f352-a0fc-f72f-e66e-594f9249cb8c@kaod.org>
Date:   Tue, 15 Feb 2022 10:07:51 +0100
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Subject: Re: [PATCH 03/10] spi: spi-mem: Add driver for Aspeed SMC controllers
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To:     Lukas Wunner <lukas@wunner.de>
CC:     <linux-spi@vger.kernel.org>, <linux-mtd@lists.infradead.org>,
        Mark Brown <broonie@kernel.org>,
        Tudor Ambarus <tudor.ambarus@microchip.com>,
        Pratyush Yadav <p.yadav@ti.com>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        <linux-aspeed@lists.ozlabs.org>, Joel Stanley <joel@jms.id.au>,
        Andrew Jeffery <andrew@aj.id.au>,
        Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>,
        <devicetree@vger.kernel.org>, Rob Herring <robh+dt@kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>
References: <20220214094231.3753686-1-clg@kaod.org>
 <20220214094231.3753686-4-clg@kaod.org> <20220215062743.GA12431@wunner.de>
From:   =?UTF-8?Q?C=c3=a9dric_Le_Goater?= <clg@kaod.org>
In-Reply-To: <20220215062743.GA12431@wunner.de>
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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.