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spi: stm32: clear only asserted irq flags on interrupt

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[ Upstream commit ae1ba50f1e706dfd7ce402ac52c1f1f10becad68 ]

Previously the stm32h7 interrupt thread cleared all non-masked interrupts.
If an interrupt was to occur during the handling of another interrupt its
flag would be unset, resulting in a lost interrupt.
This patches fixes the issue by clearing only the currently set interrupt
flags.

Signed-off-by: Tobias Schramm <t.schramm@manjaro.org>
Link: https://lore.kernel.org/r/20200804195136.1485392-1-t.schramm@manjaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tobias Schramm 2020-08-04 21:51:36 +02:00 committed by Greg Kroah-Hartman
parent d63728afe9
commit e4351ad44d
1 changed files with 1 additions and 1 deletions
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2
drivers/spi/spi-stm32.c
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@ -962,7 +962,7 @@ static irqreturn_t stm32h7_spi_irq_thread(int irq, void *dev_id)
if (!spi->cur_usedma && (spi->rx_buf && (spi->rx_len > 0))) if (!spi->cur_usedma && (spi->rx_buf && (spi->rx_len > 0)))
stm32h7_spi_read_rxfifo(spi, false); stm32h7_spi_read_rxfifo(spi, false);
writel_relaxed(mask, spi->base + STM32H7_SPI_IFCR); writel_relaxed(sr & mask, spi->base + STM32H7_SPI_IFCR);
spin_unlock_irqrestore(&spi->lock, flags); spin_unlock_irqrestore(&spi->lock, flags);