From 2631d1bd96569d9a000645cc9955f229e0fbde5b Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Fri, 23 Aug 2019 00:24:50 +0300 Subject: 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 Link: https://lore.kernel.org/r/20190822212450.21420-2-olteanv@gmail.com Signed-off-by: Mark Brown Cc: stable@vger.kernel.org Cc: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/spi/spi-fsl-dspi.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index 6da70a62e196..befabddf897a 100644 --- 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[] = { -- cgit v1.2.3