From: Vignesh Raghavendra vigneshr@ti.com
stable inclusion from linux-4.19.149 commit 69077bd8f19a34a5a3bb05fd8bc032aa7983ef80
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[ Upstream commit 7cf4df30a98175033e9849f7f16c46e96ba47f41 ]
Terminate and flush DMA internal buffers, before pushing RX data to higher layer. Otherwise, this will lead to data corruption, as driver would end up pushing stale buffer data to higher layer while actual data is still stuck inside DMA hardware and has yet not arrived at the memory. While at that, replace deprecated dmaengine_terminate_all() with dmaengine_terminate_async().
Signed-off-by: Vignesh Raghavendra vigneshr@ti.com Link: https://lore.kernel.org/r/20200319110344.21348-2-vigneshr@ti.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/tty/serial/8250/8250_omap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index a7e555e413a6..cbd006fb7fbb 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -781,7 +781,10 @@ static void __dma_rx_do_complete(struct uart_8250_port *p) dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state);
count = dma->rx_size - state.residue; - + if (count < dma->rx_size) + dmaengine_terminate_async(dma->rxchan); + if (!count) + goto unlock; ret = tty_insert_flip_string(tty_port, dma->rx_buf, count);
p->port.icount.rx += ret; @@ -843,7 +846,6 @@ static void omap_8250_rx_dma_flush(struct uart_8250_port *p) spin_unlock_irqrestore(&priv->rx_dma_lock, flags);
__dma_rx_do_complete(p); - dmaengine_terminate_all(dma->rxchan); }
static int omap_8250_rx_dma(struct uart_8250_port *p)