Coverity reports the Unchecked return value (CHECKED_RETURN) warning:
Calling dmaengine_tx_status without checking return value.
So here add the return value check for dmaengine_tx_status() function to
make coverity happy.
Fixes: cf9aa72d2f91 ("tty: serial: fsl_lpuart: optimize the timer based EOP logic")
Signed-off-by: Sherry Sun <sherry.sun@xxxxxxx>
---
drivers/tty/serial/fsl_lpuart.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 92a3bd0f4158..f2a47a8c5b85 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1286,13 +1286,19 @@ static void lpuart_dma_rx_complete(void *arg)
static void lpuart_timer_func(struct timer_list *t)
{
struct lpuart_port *sport = from_timer(sport, t, lpuart_timer);
+ enum dma_status dmastat;
struct dma_chan *chan = sport->dma_rx_chan;
struct circ_buf *ring = &sport->rx_ring;
struct dma_tx_state state;
unsigned long flags;
int count;
- dmaengine_tx_status(chan, sport->dma_rx_cookie, &state);
+ dmastat = dmaengine_tx_status(chan, sport->dma_rx_cookie, &state);
+ if (dmastat == DMA_ERROR) {
+ dev_err(sport->port.dev, "Rx DMA transfer failed!\n");
+ return;
+ }
+
ring->head = sport->rx_sgl.length - state.residue;
count = CIRC_CNT(ring->head, ring->tail, sport->rx_sgl.length);
--
2.17.1
