On Mon, Dec 27, 2021 at 10:45:25AM +0100, Uwe Kleine-König wrote:
> This fixes device lifetime issues where it was possible to free a live
> struct device.
>
> Fixes: f213729f6796 ("counter: new TI eQEP driver")
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Acked-by: William Breathitt Gray <vilhelm.gray@xxxxxxxxx>
> ---
> drivers/counter/ti-eqep.c | 29 +++++++++++++++--------------
> 1 file changed, 15 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/counter/ti-eqep.c b/drivers/counter/ti-eqep.c
> index abeda966e7be..3b49b492d182 100644
> --- a/drivers/counter/ti-eqep.c
> +++ b/drivers/counter/ti-eqep.c
> @@ -368,13 +368,15 @@ static const struct regmap_config ti_eqep_regmap16_config = {
> static int ti_eqep_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> + struct counter_device *counter;
> struct ti_eqep_cnt *priv;
> void __iomem *base;
> int err;
>
> - priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> - if (!priv)
> + counter = devm_counter_alloc(dev, sizeof(*priv));
> + if (!counter)
> return -ENOMEM;
> + priv = counter_priv(counter);
>
> base = devm_platform_ioremap_resource(pdev, 0);
> if (IS_ERR(base))
> @@ -390,16 +392,15 @@ static int ti_eqep_probe(struct platform_device *pdev)
> if (IS_ERR(priv->regmap16))
> return PTR_ERR(priv->regmap16);
>
> - priv->counter.name = dev_name(dev);
> - priv->counter.parent = dev;
> - priv->counter.ops = &ti_eqep_counter_ops;
> - priv->counter.counts = ti_eqep_counts;
> - priv->counter.num_counts = ARRAY_SIZE(ti_eqep_counts);
> - priv->counter.signals = ti_eqep_signals;
> - priv->counter.num_signals = ARRAY_SIZE(ti_eqep_signals);
> - priv->counter.priv = priv;
> + counter->name = dev_name(dev);
> + counter->parent = dev;
> + counter->ops = &ti_eqep_counter_ops;
> + counter->counts = ti_eqep_counts;
> + counter->num_counts = ARRAY_SIZE(ti_eqep_counts);
> + counter->signals = ti_eqep_signals;
> + counter->num_signals = ARRAY_SIZE(ti_eqep_signals);
>
> - platform_set_drvdata(pdev, priv);
> + platform_set_drvdata(pdev, counter);
>
> /*
> * Need to make sure power is turned on. On AM33xx, this comes from the
> @@ -409,7 +410,7 @@ static int ti_eqep_probe(struct platform_device *pdev)
> pm_runtime_enable(dev);
> pm_runtime_get_sync(dev);
>
> - err = counter_register(&priv->counter);
> + err = counter_add(counter);
> if (err < 0) {
> pm_runtime_put_sync(dev);
> pm_runtime_disable(dev);
> @@ -421,10 +422,10 @@ static int ti_eqep_probe(struct platform_device *pdev)
>
> static int ti_eqep_remove(struct platform_device *pdev)
> {
> - struct ti_eqep_cnt *priv = platform_get_drvdata(pdev);
> + struct counter_device *counter = platform_get_drvdata(pdev);
> struct device *dev = &pdev->dev;
>
> - counter_unregister(&priv->counter);
> + counter_unregister(counter);
> pm_runtime_put_sync(dev);
> pm_runtime_disable(dev);
>
> --
> 2.33.0
>
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