Commit b867eef4 authored by Chris Packham's avatar Chris Packham Committed by Mark Brown

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

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 3282a3da ("powerpc/64:
Implement soft interrupt replay in C").
Signed-off-by: default avatarChris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20200904002812.7300-1-chris.packham@alliedtelesis.co.nzSigned-off-by: default avatarMark Brown <broonie@kernel.org>
parent 50851f50
...@@ -564,13 +564,14 @@ static void fsl_espi_cpu_irq(struct fsl_espi *espi, u32 events) ...@@ -564,13 +564,14 @@ static void fsl_espi_cpu_irq(struct fsl_espi *espi, u32 events)
static irqreturn_t fsl_espi_irq(s32 irq, void *context_data) static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
{ {
struct fsl_espi *espi = context_data; struct fsl_espi *espi = context_data;
u32 events; u32 events, mask;
spin_lock(&espi->lock); spin_lock(&espi->lock);
/* Get interrupt events(tx/rx) */ /* Get interrupt events(tx/rx) */
events = fsl_espi_read_reg(espi, ESPI_SPIE); 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); spin_unlock(&espi->lock);
return IRQ_NONE; return IRQ_NONE;
} }
......
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