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spi: fsl-espi: Only process interrupts for expected events

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[ Upstream commit b867eef4cf ]

The SPIE register contains counts for the TX FIFO so any time the irq
handler was invoked we would attempt to process the RX/TX fifos. Use the
SPIM value to mask the events so that we only process interrupts that
were expected.

This was a latent issue exposed by commit 3282a3da25 ("powerpc/64:
Implement soft interrupt replay in C").

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20200904002812.7300-1-chris.packham@alliedtelesis.co.nz
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chris Packham 2020-09-04 12:28:12 +12:00 committed by Greg Kroah-Hartman
parent 8cc5eb809a
commit 157ccdf7eb
1 changed files with 3 additions and 2 deletions
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5
drivers/spi/spi-fsl-espi.c
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@ -555,13 +555,14 @@ static void fsl_espi_cpu_irq(struct fsl_espi *espi, u32 events)
static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
{
struct fsl_espi *espi = context_data;
u32 events;
u32 events, mask;
spin_lock(&espi->lock);
/* Get interrupt events(tx/rx) */
events = fsl_espi_read_reg(espi, ESPI_SPIE);
if (!events) {
mask = fsl_espi_read_reg(espi, ESPI_SPIM);
if (!(events & mask)) {
spin_unlock(&espi->lock);
return IRQ_NONE;
}