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

BugLink: https://bugs.launchpad.net/bugs/1848046
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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index 53335ccc98f61812d30e78eea8e036b28314cfe0..545fc8189fb0af39b98fc762511d2b417fea437c 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[] = {