diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c
index dab37fbfab82..6b19bffbad78 100644
--- a/drivers/irqchip/irq-stm32-exti.c
+++ b/drivers/irqchip/irq-stm32-exti.c
@@ -716,7 +716,6 @@ stm32_exti_chip_data *stm32_exti_chip_init(struct stm32_exti_host_data *h_data,
 	const struct stm32_exti_bank *stm32_bank;
 	struct stm32_exti_chip_data *chip_data;
 	void __iomem *base = h_data->base;
-	u32 irqs_mask;
 
 	stm32_bank = h_data->drv_data->exti_banks[bank_idx];
 	chip_data = &h_data->chips_data[bank_idx];
@@ -725,10 +724,6 @@ stm32_exti_chip_data *stm32_exti_chip_init(struct stm32_exti_host_data *h_data,
 
 	raw_spin_lock_init(&chip_data->rlock);
 
-	/* Determine number of irqs supported */
-	writel_relaxed(~0UL, base + stm32_bank->rtsr_ofst);
-	irqs_mask = readl_relaxed(base + stm32_bank->rtsr_ofst);
-
 	/*
 	 * This IP has no reset, so after hot reboot we should
 	 * clear registers to avoid residue