[RESEND PATCH] irqchip/stm32-exti: Use the hwspin_lock_timeout_in_atomic() API

[RESEND PATCH] irqchip/stm32-exti: Use the hwspin_lock_timeout_in_atomic() API

[Alexandre Torgue]

From: Fabien Dessenne <fabien.dessenne@st.com>

Now that the hwspin_lock_timeout_in_atomic() API is available use it.

Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c
index faa8482c8246..c7ab69694931 100644
--- a/drivers/irqchip/irq-stm32-exti.c
+++ b/drivers/irqchip/irq-stm32-exti.c
@@ -25,7 +25,6 @@
 #define IRQS_PER_BANK 32
 
 #define HWSPNLCK_TIMEOUT	1000 /* usec */
-#define HWSPNLCK_RETRY_DELAY	100  /* usec */
 
 struct stm32_exti_bank {
 	u32 imr_ofst;
@@ -277,55 +276,24 @@ static int stm32_exti_set_type(struct irq_data *d,
 	return 0;
 }
 
-static int stm32_exti_hwspin_lock(struct stm32_exti_chip_data *chip_data)
-{
-	int ret, timeout = 0;
-
-	if (!chip_data->host_data->hwlock)
-		return 0;
-
-	/*
-	 * Use the x_raw API since we are under spin_lock protection.
-	 * Do not use the x_timeout API because we are under irq_disable
-	 * mode (see __setup_irq())
-	 */
-	do {
-		ret = hwspin_trylock_raw(chip_data->host_data->hwlock);
-		if (!ret)
-			return 0;
-
-		udelay(HWSPNLCK_RETRY_DELAY);
-		timeout += HWSPNLCK_RETRY_DELAY;
-	} while (timeout < HWSPNLCK_TIMEOUT);
-
-	if (ret == -EBUSY)
-		ret = -ETIMEDOUT;
-
-	if (ret)
-		pr_err("%s can't get hwspinlock (%d)\n", __func__, ret);
-
-	return ret;
-}
-
-static void stm32_exti_hwspin_unlock(struct stm32_exti_chip_data *chip_data)
-{
-	if (chip_data->host_data->hwlock)
-		hwspin_unlock_raw(chip_data->host_data->hwlock);
-}
-
 static int stm32_irq_set_type(struct irq_data *d, unsigned int type)
 {
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct stm32_exti_chip_data *chip_data = gc->private;
 	const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
+	struct hwspinlock *hwlock = chip_data->host_data->hwlock;
 	u32 rtsr, ftsr;
 	int err;
 
 	irq_gc_lock(gc);
 
-	err = stm32_exti_hwspin_lock(chip_data);
-	if (err)
-		goto unlock;
+	if (hwlock) {
+		err = hwspin_lock_timeout_in_atomic(hwlock, HWSPNLCK_TIMEOUT);
+		if (err) {
+			pr_err("%s can't get hwspinlock (%d)\n", __func__, err);
+			goto unlock;
+		}
+	}
 
 	rtsr = irq_reg_readl(gc, stm32_bank->rtsr_ofst);
 	ftsr = irq_reg_readl(gc, stm32_bank->ftsr_ofst);
@@ -338,7 +306,8 @@ static int stm32_irq_set_type(struct irq_data *d, unsigned int type)
 	irq_reg_writel(gc, ftsr, stm32_bank->ftsr_ofst);
 
 unspinlock:
-	stm32_exti_hwspin_unlock(chip_data);
+	if (hwlock)
+		hwspin_unlock_in_atomic(hwlock);
 unlock:
 	irq_gc_unlock(gc);
 
@@ -504,15 +473,20 @@ static int stm32_exti_h_set_type(struct irq_data *d, unsigned int type)
 {
 	struct stm32_exti_chip_data *chip_data = irq_data_get_irq_chip_data(d);
 	const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
+	struct hwspinlock *hwlock = chip_data->host_data->hwlock;
 	void __iomem *base = chip_data->host_data->base;
 	u32 rtsr, ftsr;
 	int err;
 
 	raw_spin_lock(&chip_data->rlock);
 
-	err = stm32_exti_hwspin_lock(chip_data);
-	if (err)
-		goto unlock;
+	if (hwlock) {
+		err = hwspin_lock_timeout_in_atomic(hwlock, HWSPNLCK_TIMEOUT);
+		if (err) {
+			pr_err("%s can't get hwspinlock (%d)\n", __func__, err);
+			goto unlock;
+		}
+	}
 
 	rtsr = readl_relaxed(base + stm32_bank->rtsr_ofst);
 	ftsr = readl_relaxed(base + stm32_bank->ftsr_ofst);
@@ -525,7 +499,8 @@ static int stm32_exti_h_set_type(struct irq_data *d, unsigned int type)
 	writel_relaxed(ftsr, base + stm32_bank->ftsr_ofst);
 
 unspinlock:
-	stm32_exti_hwspin_unlock(chip_data);
+	if (hwlock)
+		hwspin_unlock_in_atomic(hwlock);
 unlock:
 	raw_spin_unlock(&chip_data->rlock);
 
-- 
2.17.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [RESEND PATCH] irqchip/stm32-exti: Use the hwspin_lock_timeout_in_atomic() API

[Marc Zyngier]

On Mon, 6 Jul 2020 10:11:15 +0200, Alexandre Torgue wrote:
> Now that the hwspin_lock_timeout_in_atomic() API is available use it.
> 
> Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
> Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
> 
> diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c
> index faa8482c8246..c7ab69694931 100644
> --- a/drivers/irqchip/irq-stm32-exti.c
> +++ b/drivers/irqchip/irq-stm32-exti.c
> @@ -25,7 +25,6 @@
>  #define IRQS_PER_BANK 32
> 
> [...]

Applied to irq/irqchip-5.9, thanks!

[1/1] irqchip/stm32-exti: Use the hwspin_lock_timeout_in_atomic() API
      commit: e5c19cf32b68d8c59cd3e94e257ab030f07db7d6

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.



_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel