From: Jon Lin <jon.lin@xxxxxxxxxxxxxx>
[ Upstream commit 4294e4accf8d695ea5605f6b189008b692e3e82c ]
The RXFLR is possible larger than rx_left in Rockchip SPI, fix it.
Fixes: 01b59ce5dac8 ("spi: rockchip: use irq rather than polling")
Signed-off-by: Jon Lin <jon.lin@xxxxxxxxxxxxxx>
Tested-by: Emil Renner Berthing <kernel@xxxxxxxx>
Reviewed-by: Heiko Stuebner <heiko@xxxxxxxxx>
Reviewed-by: Emil Renner Berthing <kernel@xxxxxxxx>
Link: https://lore.kernel.org/r/20200723004356.6390-3-jon.lin@xxxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/spi/spi-rockchip.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 2cc6d9951b52e..008b64f4e031a 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -286,7 +286,7 @@ static void rockchip_spi_pio_writer(struct rockchip_spi *rs)
static void rockchip_spi_pio_reader(struct rockchip_spi *rs)
{
u32 words = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
- u32 rx_left = rs->rx_left - words;
+ u32 rx_left = (rs->rx_left > words) ? rs->rx_left - words : 0;
/* the hardware doesn't allow us to change fifo threshold
* level while spi is enabled, so instead make sure to leave
--
2.25.1
