[PATCH 1/2] pinctrl: sx150x: Return IRQ_NONE if no pending irq

The driver currently reads the interrupt source register, writes the
value back to clear it, and always returns IRQ_HANDLED.
When the IRQ is shared, the handler should not claim interrupts that are
not from this device.

Check for zero interrupt source first. It no interrupt is pending,
return IRQ_NONE and skip the register write.

Signed-off-by: Tsz Shan Chan <[email protected]>
---
 drivers/pinctrl/pinctrl-sx150x.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-sx150x.c b/drivers/pinctrl/pinctrl-sx150x.c
index b59d913513d5..015b1d0744e4 100644
--- a/drivers/pinctrl/pinctrl-sx150x.c
+++ b/drivers/pinctrl/pinctrl-sx150x.c
@@ -550,6 +550,9 @@ static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
 	if (err < 0)
 		return IRQ_NONE;
 
+	if (!val)
+		return IRQ_NONE;
+
 	err = regmap_write(pctl->regmap, pctl->data->reg_irq_src, val);
 	if (err < 0)
 		return IRQ_NONE;

-- 
2.55.0