linux-kernel - Re: [PATCH v2 18/23] counter: ftm-quaddec: Convert to new counter registration

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Date:   Wed, 29 Dec 2021 17:33:40 +0900
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     Lars-Peter Clausen <lars@...afoo.de>, kernel@...gutronix.de,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-iio@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Syed Nayyar Waris <syednwaris@...il.com>,
        Patrick Havelange <patrick.havelange@...ensium.com>
Subject: Re: [PATCH v2 18/23] counter: ftm-quaddec: Convert to new counter
 registration

On Mon, Dec 27, 2021 at 10:45:21AM +0100, Uwe Kleine-König wrote:
> This fixes device lifetime issues where it was possible to free a live
> struct device.
> 
> Fixes: a3b9a99980d9 ("counter: add FlexTimer Module Quadrature decoder counter driver")
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Acked-by: William Breathitt Gray <vilhelm.gray@...il.com>

> ---
>  drivers/counter/104-quad-8.c  |  7 ++++---
>  drivers/counter/ftm-quaddec.c | 27 +++++++++++++--------------
>  2 files changed, 17 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c
> index 4315b14f239e..680c7ba943a4 100644
> --- a/drivers/counter/104-quad-8.c
> +++ b/drivers/counter/104-quad-8.c
> @@ -1084,7 +1084,8 @@ static struct counter_count quad8_counts[] = {
>  
>  static irqreturn_t quad8_irq_handler(int irq, void *private)
>  {
> -	struct quad8 *const priv = private;
> +	struct counter_device *counter = private;
> +	struct quad8 *const priv = counter_priv(counter);
>  	const unsigned long base = priv->base;
>  	unsigned long irq_status;
>  	unsigned long channel;
> @@ -1115,7 +1116,7 @@ static irqreturn_t quad8_irq_handler(int irq, void *private)
>  			continue;
>  		}
>  
> -		counter_push_event(&priv->counter, event, channel);
> +		counter_push_event(counter, event, channel);
>  	}
>  
>  	/* Clear pending interrupts on device */
> @@ -1192,7 +1193,7 @@ static int quad8_probe(struct device *dev, unsigned int id)
>  	outb(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, base[id] + QUAD8_REG_CHAN_OP);
>  
>  	err = devm_request_irq(dev, irq[id], quad8_irq_handler, IRQF_SHARED,
> -			       counter->name, priv);
> +			       counter->name, counter);
>  	if (err)
>  		return err;
>  
> diff --git a/drivers/counter/ftm-quaddec.c b/drivers/counter/ftm-quaddec.c
> index f5d92df6a611..c636183b1337 100644
> --- a/drivers/counter/ftm-quaddec.c
> +++ b/drivers/counter/ftm-quaddec.c
> @@ -26,7 +26,6 @@
>  	})
>  
>  struct ftm_quaddec {
> -	struct counter_device counter;
>  	struct platform_device *pdev;
>  	void __iomem *ftm_base;
>  	bool big_endian;
> @@ -259,15 +258,16 @@ static struct counter_count ftm_quaddec_counts = {
>  
>  static int ftm_quaddec_probe(struct platform_device *pdev)
>  {
> +	struct counter_device *counter;
>  	struct ftm_quaddec *ftm;
> -
>  	struct device_node *node = pdev->dev.of_node;
>  	struct resource *io;
>  	int ret;
>  
> -	ftm = devm_kzalloc(&pdev->dev, sizeof(*ftm), GFP_KERNEL);
> -	if (!ftm)
> +	counter = devm_counter_alloc(&pdev->dev, sizeof(*ftm));
> +	if (!counter)
>  		return -ENOMEM;
> +	ftm = counter_priv(counter);
>  
>  	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	if (!io) {
> @@ -283,14 +283,13 @@ static int ftm_quaddec_probe(struct platform_device *pdev)
>  		dev_err(&pdev->dev, "Failed to map memory region\n");
>  		return -EINVAL;
>  	}
> -	ftm->counter.name = dev_name(&pdev->dev);
> -	ftm->counter.parent = &pdev->dev;
> -	ftm->counter.ops = &ftm_quaddec_cnt_ops;
> -	ftm->counter.counts = &ftm_quaddec_counts;
> -	ftm->counter.num_counts = 1;
> -	ftm->counter.signals = ftm_quaddec_signals;
> -	ftm->counter.num_signals = ARRAY_SIZE(ftm_quaddec_signals);
> -	ftm->counter.priv = ftm;
> +	counter->name = dev_name(&pdev->dev);
> +	counter->parent = &pdev->dev;
> +	counter->ops = &ftm_quaddec_cnt_ops;
> +	counter->counts = &ftm_quaddec_counts;
> +	counter->num_counts = 1;
> +	counter->signals = ftm_quaddec_signals;
> +	counter->num_signals = ARRAY_SIZE(ftm_quaddec_signals);
>  
>  	mutex_init(&ftm->ftm_quaddec_mutex);
>  
> @@ -300,9 +299,9 @@ static int ftm_quaddec_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> -	ret = devm_counter_register(&pdev->dev, &ftm->counter);
> +	ret = devm_counter_add(&pdev->dev, counter);
>  	if (ret)
> -		return ret;
> +		return dev_err_probe(&pdev->dev, ret, "Failed to add counter\n");
>  
>  	return 0;
>  }
> -- 
> 2.33.0
> 

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