linux-kernel - Re: [PATCH v2] spi: stm32-qspi: Update spi registering

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Date:   Sun, 16 Jan 2022 13:52:05 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     patrice.chotard@...s.st.com
Cc:     Mark Brown <broonie@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        linux-spi@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        christophe.kerello@...s.st.com, stable@...r.kernel.org
Subject: Re: [PATCH v2] spi: stm32-qspi: Update spi registering

On Wed, Jan 12, 2022 at 03:44:24PM +0100, patrice.chotard@...s.st.com wrote:
> diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c
> index 514337c86d2c..09839a3dbb26 100644
> --- a/drivers/spi/spi-stm32-qspi.c
> +++ b/drivers/spi/spi-stm32-qspi.c
> @@ -688,7 +688,7 @@ static int stm32_qspi_probe(struct platform_device *pdev)
>  	struct resource *res;
>  	int ret, irq;
>  
> -	ctrl = spi_alloc_master(dev, sizeof(*qspi));
> +	ctrl = devm_spi_alloc_master(dev, sizeof(*qspi));
>  	if (!ctrl)
>  		return -ENOMEM;
>  
> @@ -784,7 +784,7 @@ static int stm32_qspi_probe(struct platform_device *pdev)
>  	pm_runtime_enable(dev);
>  	pm_runtime_get_noresume(dev);
>  
> -	ret = devm_spi_register_master(dev, ctrl);
> +	ret = spi_register_master(ctrl);
>  	if (ret)
>  		goto err_pm_runtime_free;
>

Unfortunately this patch is still not correct:  It introduces a
double free in the probe error path.

You need to remove this...

err_master_put:
	spi_master_put(qspi->ctrl);

...and replace all the gotos in stm32_qspi_probe() which jump
to the err_master_put label with a return statement.

Thanks,

Lukas