spi: xilinx: Return IRQ_NONE if no interrupts were detected

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@metafoo.de>
Acked-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index e62eb9ace825cfb3a97082ad5e65973abe8e26fe..bc7100b93dfcf0c24213f479f9a5fffc41666315 100644 (file)
--- 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)