[PATCH 4.19 16/86] spi: spi-fsl-dspi: Exit the ISR with IRQ_NONE when its not ours

[Greg Kroah-Hartman]

From: Vladimir Oltean <olteanv@xxxxxxxxx>

commit d41f36a6464a85c06ad920703d878e4491d2c023 upstream.

The DSPI interrupt can be shared between two controllers at least on the
LX2160A. In that case, the driver for one controller might misbehave and
consume the other's interrupt. Fix this by actually checking if any of
the bits in the status register have been asserted.

Fixes: 13aed2392741 ("spi: spi-fsl-dspi: use IRQF_SHARED mode to request IRQ")
Signed-off-by: Vladimir Oltean <olteanv@xxxxxxxxx>
Link: https://lore.kernel.org/r/20190822212450.21420-2-olteanv@xxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/spi/spi-fsl-dspi.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -878,9 +878,11 @@ static irqreturn_t dspi_interrupt(int ir
 					trans_mode);
 			}
 		}
+
+		return IRQ_HANDLED;
 	}
 
-	return IRQ_HANDLED;
+	return IRQ_NONE;
 }
 
 static const struct of_device_id fsl_dspi_dt_ids[] = {