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spi: stm32h7: fix race condition at end of transfer

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[ Upstream commit 135dd873d3c76d812ae64c668adef3f2c59ed27f ]

The caller of stm32_spi_transfer_one(), spi_transfer_one_message(),
is waiting for us to call spi_finalize_current_transfer() and will
eventually schedule a new transfer, if available.
We should guarantee that the spi controller is really available
before calling spi_finalize_current_transfer().

Move the call to spi_finalize_current_transfer() _after_ the call
to stm32_spi_disable().

Signed-off-by: Antonio Borneo <antonio.borneo@st.com>
Signed-off-by: Alain Volmat <alain.volmat@st.com>
Link: https://lore.kernel.org/r/1597043558-29668-2-git-send-email-alain.volmat@st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Antonio Borneo 2020-08-10 09:12:34 +02:00 • committed by Greg Kroah-Hartman
commit 3c15a3c4b1
1 changed files with 1 additions and 1 deletions
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2
drivers/spi/spi-stm32.c
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@ -967,8 +967,8 @@ static irqreturn_t stm32h7_spi_irq_thread(int irq, void *dev_id)
spin_unlock_irqrestore(&spi->lock, flags);
if (end) {
spi_finalize_current_transfer(master);
stm32h7_spi_disable(spi);
spi_finalize_current_transfer(master);
}
return IRQ_HANDLED;