From: Vladimir Oltean olteanv@gmail.com
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 --- drivers/spi/spi-fsl-dspi.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index 43809fad250b..1b003dba86f9 100644 --- a/drivers/spi/spi-fsl-dspi.c +++ b/drivers/spi/spi-fsl-dspi.c @@ -878,9 +878,11 @@ 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[] = {