[PATCH v2 3/6] spi: tegra210-quad: Protect curr_xfer assignment in tegra_qspi_setup_transfer_one

[Breno Leitao <leitao@debian.org>]

When the timeout handler processes a completed transfer and signals
completion, the transfer thread can immediately set up the next transfer
and assign curr_xfer to point to it.

If a delayed ISR from the previous transfer then runs, it checks if
(!tqspi->curr_xfer) (currently without the lock also -- to be fixed
soon) to detect stale interrupts, but this check passes because
curr_xfer now points to the new transfer. The ISR then incorrectly
processes the new transfer's context.

Protect the curr_xfer assignment with the spinlock to ensure the ISR
either sees NULL (and bails out) or sees the new value only after the
assignment is complete.

Fixes: 921fc1838fb0 ("spi: tegra210-quad: Add support for Tegra210 QSPI controller")
Signed-off-by: Breno Leitao <leitao@debian.org>
---
 drivers/spi/spi-tegra210-quad.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/spi/spi-tegra210-quad.c b/drivers/spi/spi-tegra210-quad.c
index ee291b9e9e9c0..15c110c00aca5 100644
--- a/drivers/spi/spi-tegra210-quad.c
+++ b/drivers/spi/spi-tegra210-quad.c
@@ -839,6 +839,7 @@ static u32 tegra_qspi_setup_transfer_one(struct spi_device *spi, struct spi_tran
 	u32 command1, command2, speed = t->speed_hz;
 	u8 bits_per_word = t->bits_per_word;
 	u32 tx_tap = 0, rx_tap = 0;
+	unsigned long flags;
 	int req_mode;
 
 	if (!has_acpi_companion(tqspi->dev) && speed != tqspi->cur_speed) {
@@ -846,10 +847,12 @@ static u32 tegra_qspi_setup_transfer_one(struct spi_device *spi, struct spi_tran
 		tqspi->cur_speed = speed;
 	}
 
+	spin_lock_irqsave(&tqspi->lock, flags);
 	tqspi->cur_pos = 0;
 	tqspi->cur_rx_pos = 0;
 	tqspi->cur_tx_pos = 0;
 	tqspi->curr_xfer = t;
+	spin_unlock_irqrestore(&tqspi->lock, flags);
 
 	if (is_first_of_msg) {
 		tegra_qspi_mask_clear_irq(tqspi);

-- 
2.47.3