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-rw-r--r--drivers/counter/stm32-timer-cnt.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
index cd50dc12bd02..2295be3f309a 100644
--- a/drivers/counter/stm32-timer-cnt.c
+++ b/drivers/counter/stm32-timer-cnt.c
@@ -32,6 +32,7 @@ struct stm32_timer_cnt {
struct regmap *regmap;
struct clk *clk;
u32 ceiling;
+ u32 max_arr;
bool enabled;
struct stm32_timer_regs bak;
};
@@ -191,6 +192,9 @@ static ssize_t stm32_count_ceiling_write(struct counter_device *counter,
if (ret)
return ret;
+ if (ceiling > priv->max_arr)
+ return -ERANGE;
+
/* TIMx_ARR register shouldn't be buffered (ARPE=0) */
regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_ARPE, 0);
regmap_write(priv->regmap, TIM_ARR, ceiling);
@@ -371,6 +375,7 @@ static int stm32_timer_cnt_probe(struct platform_device *pdev)
priv->regmap = ddata->regmap;
priv->clk = ddata->clk;
priv->ceiling = ddata->max_arr;
+ priv->max_arr = ddata->max_arr;
priv->counter.name = dev_name(dev);
priv->counter.parent = dev;