Merge tag 'spi-fix-v4.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

[cascardo/linux.git] / drivers / tty / serial / fsl_lpuart.c

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index de9d510..76103f2 100644 (file)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -328,7 +328,7 @@ static void lpuart_dma_tx(struct lpuart_port *sport)
 
        sport->dma_tx_bytes = uart_circ_chars_pending(xmit);
 
-       if (xmit->tail < xmit->head) {
+       if (xmit->tail < xmit->head || xmit->head == 0) {
                sport->dma_tx_nents = 1;
                sg_init_one(sgl, xmit->buf + xmit->tail, sport->dma_tx_bytes);
        } else {
@@ -359,7 +359,6 @@ static void lpuart_dma_tx(struct lpuart_port *sport)
        sport->dma_tx_in_progress = true;
        sport->dma_tx_cookie = dmaengine_submit(sport->dma_tx_desc);
        dma_async_issue_pending(sport->dma_tx_chan);
-
 }
 
 static void lpuart_dma_tx_complete(void *arg)