[PATCH] i2c: spacemit: fix spurious IRQ handling returning IRQ_HANDLED

[Pei Xiao]

When the interrupt status register reads zero (no interrupt pending
from this device), the handler should return IRQ_NONE. Returning
IRQ_HANDLED incorrectly claims the interrupt was serviced, which can
prevent other devices sharing the same IRQ line from receiving their
interrupts.

Fix this by returning IRQ_NONE instead of IRQ_HANDLED when the
status register is zero.

Fixes: 5ea558473fa3 ("i2c: spacemit: add support for SpacemiT K1 SoC")
Signed-off-by: Pei Xiao <xiaopei01 at kylinos.cn>
---
 drivers/i2c/busses/i2c-k1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-k1.c b/drivers/i2c/busses/i2c-k1.c
index c2d090f6ba80..487f23fde725 100644
--- a/drivers/i2c/busses/i2c-k1.c
+++ b/drivers/i2c/busses/i2c-k1.c
@@ -728,7 +728,7 @@ static irqreturn_t spacemit_i2c_irq_handler(int irq, void *devid)
 
 	status = readl(i2c->base + SPACEMIT_ISR);
 	if (!status)
-		return IRQ_HANDLED;
+		return IRQ_NONE;
 
 	i2c->status = status;
 
-- 
2.25.1