Re: [PATCH for next v1 1/2] gpio: omap: Replace raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler()

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On 08/02/2021 10:56, Luo Jiaxing wrote:
There is no need to use API with _irqsave in omap_gpio_irq_handler(),
because it already be in a irq-disabled context.

Signed-off-by: Luo Jiaxing <luojiaxing@xxxxxxxxxx>
---
  drivers/gpio/gpio-omap.c | 15 ++++++---------
  1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 41952bb..dc8bbf4 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -560,8 +560,6 @@ static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
  	u32 enabled, isr, edge;
  	unsigned int bit;
  	struct gpio_bank *bank = gpiobank;
-	unsigned long wa_lock_flags;
-	unsigned long lock_flags;
isr_reg = bank->base + bank->regs->irqstatus;
  	if (WARN_ON(!isr_reg))
@@ -572,7 +570,7 @@ static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
  		return IRQ_NONE;
while (1) {
-		raw_spin_lock_irqsave(&bank->lock, lock_flags);
+		raw_spin_lock(&bank->lock);
enabled = omap_get_gpio_irqbank_mask(bank);
  		isr = readl_relaxed(isr_reg) & enabled;
@@ -586,7 +584,7 @@ static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
  		if (edge)
  			omap_clear_gpio_irqbank(bank, edge);
- raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
+		raw_spin_unlock(&bank->lock);
if (!isr)
  			break;
@@ -595,7 +593,7 @@ static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
  			bit = __ffs(isr);
  			isr &= ~(BIT(bit));
- raw_spin_lock_irqsave(&bank->lock, lock_flags);
+			raw_spin_lock(&bank->lock);
  			/*
  			 * Some chips can't respond to both rising and falling
  			 * at the same time.  If this irq was requested with
@@ -606,15 +604,14 @@ static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
  			if (bank->toggle_mask & (BIT(bit)))
  				omap_toggle_gpio_edge_triggering(bank, bit);
- raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
+			raw_spin_unlock(&bank->lock);
- raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
+			raw_spin_lock(&bank->wa_lock);
generic_handle_irq(irq_find_mapping(bank->chip.irq.domain,
  							    bit));
- raw_spin_unlock_irqrestore(&bank->wa_lock,
-						   wa_lock_flags);
+			raw_spin_unlock(&bank->wa_lock);
  		}
  	}
  exit:


NACK.
Who said that this is always hard IRQ handler?
What about RT-kernel or boot with "threadirqs"?

--
Best regards,
grygorii



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