spi: spi-fsl-dspi: Exit the ISR with IRQ_NONE when it's not ours

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@gmail.com>
Link: https://lore.kernel.org/r/20190822212450.21420-2-olteanv@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index 6da70a62e1964893e3361237e02d2424b97e31ec..befabddf897a4b87c21f8fce6b65a96f7db26ae2 100644 (file)
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -886,9 +886,11 @@ static irqreturn_t dspi_interrupt(int irq, void *dev_id)
                                        trans_mode);
                        }
                }
+
+               return IRQ_HANDLED;
        }
 
-       return IRQ_HANDLED;
+       return IRQ_NONE;
 }
 
 static const struct of_device_id fsl_dspi_dt_ids[] = {