[PATCH 1/5] spi: stm32h7: fix race condition at end of transfer

From: Alain Volmat
Date: Fri Aug 07 2020 - 09:25:37 EST

From: Antonio Borneo <antonio.borneo@xxxxxx>

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@xxxxxx>
Signed-off-by: Alain Volmat <alain.volmat@xxxxxx>
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 4a21feae0103..814a3ec3b8ad 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -971,8 +971,8 @@ 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);
+ spi_finalize_current_transfer(master);