linux-kernel - [PATCH AUTOSEL 5.4 10/38] spi: stm32h7: fix race condition at end of transfer

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Date:   Mon, 24 Aug 2020 12:37:22 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Antonio Borneo <antonio.borneo@...com>,
        Alain Volmat <alain.volmat@...com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-spi@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 10/38] spi: stm32h7: fix race condition at end of transfer

From: Antonio Borneo <antonio.borneo@...com>

[ 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@...com>
Signed-off-by: Alain Volmat <alain.volmat@...com>
Link: https://lore.kernel.org/r/1597043558-29668-2-git-send-email-alain.volmat@st.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spi-stm32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index db4c1584327c1..cb54471456145 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -966,8 +966,8 @@ 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;
-- 
2.25.1