[PATCH 2/2] spi: xilinx: Return IRQ_NONE if no interrupts were detected

[Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>]

Return IRQ_NONE from the interrupt handler if the handler is running, but
no interrupt was detected. This allows the system to recover in case of an
interrupt storm due to an invalid interrupt configuration or faulty
hardware.

Signed-off-by: Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
---
 drivers/spi/spi-xilinx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index 334f423..f8280f3 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -341,9 +341,10 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id)
 
 	if (ipif_isr & XSPI_INTR_TX_EMPTY) {	/* Transmission completed */
 		complete(&xspi->done);
+		return IRQ_HANDLED;
 	}
 
-	return IRQ_HANDLED;
+	return IRQ_NONE;
 }
 
 static int xilinx_spi_find_buffer_size(struct xilinx_spi *xspi)
-- 
2.1.4

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