[PATCH v3 20/23] counter: stm32-timer-cnt: Convert to new counter registration

Uwe Kleine-König
2021-12-29T15:45:52Z

This fixes device lifetime issues where it was possible to free a live
struct device.

Fixes: ad29937e206f ("counter: Add STM32 Timer quadrature encoder")
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
drivers/counter/stm32-timer-cnt.c | 30 ++++++++++++++++++------------
1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
index 4b05b198a8d8..5779ae7c73cf 100644
--- a/drivers/counter/stm32-timer-cnt.c
+++ b/drivers/counter/stm32-timer-cnt.c
@@ -29,7 +29,6 @@ struct stm32_timer_regs {
};

struct stm32_timer_cnt {
- struct counter_device counter;
struct regmap *regmap;
struct clk *clk;
u32 max_arr;
@@ -317,31 +316,38 @@ static int stm32_timer_cnt_probe(struct platform_device *pdev)
struct stm32_timers *ddata = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
struct stm32_timer_cnt *priv;
+ struct counter_device *counter;
+ int ret;

if (IS_ERR_OR_NULL(ddata))
return -EINVAL;

- 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);
+
priv->regmap = ddata->regmap;
priv->clk = ddata->clk;
priv->max_arr = ddata->max_arr;

- priv->counter.name = dev_name(dev);
- priv->counter.parent = dev;
- priv->counter.ops = &stm32_timer_cnt_ops;
- priv->counter.counts = &stm32_counts;
- priv->counter.num_counts = 1;
- priv->counter.signals = stm32_signals;
- priv->counter.num_signals = ARRAY_SIZE(stm32_signals);
- priv->counter.priv = priv;
+ counter->name = dev_name(dev);
+ counter->parent = dev;
+ counter->ops = &stm32_timer_cnt_ops;
+ counter->counts = &stm32_counts;
+ counter->num_counts = 1;
+ counter->signals = stm32_signals;
+ counter->num_signals = ARRAY_SIZE(stm32_signals);

platform_set_drvdata(pdev, priv);

/* Register Counter device */
- return devm_counter_register(dev, &priv->counter);
+ ret = devm_counter_add(dev, counter);
+ if (ret < 0)
+ dev_err_probe(dev, ret, "Failed to add counter\n");
+
+ return ret;
}

static int __maybe_unused stm32_timer_cnt_suspend(struct device *dev)
--
2.34.1