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SubjectRe: [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@pengutronix.de>

Acked-by: William Breathitt Gray <vilhelm.gray@gmail.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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