The RXFLR is possible larger than rx_left in Rockchip SPI, fix it.
Signed-off-by: Jon Lin <[email protected]>
---
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 a451dacab5cf..1f5e613b67d9 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -291,7 +291,7 @@ 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
--
2.17.1
