diff options
| author | Aaron Brice <aaron.brice@datasoft.com> | 2016-10-06 15:13:04 -0700 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2017-01-11 15:36:43 +0100 |
| commit | a650cbfc7e981ba24313da0338f4482bef514d44 (patch) | |
| tree | f2b2fcd71c99e644719f052ca4d55d207ef029c1 | |
| parent | 64086f8ac3e56e50dc60ebd53bde81a15f2f1f2f (diff) | |
tty: serial: fsl_lpuart: Fix Tx DMA edge case
In the case where head == 0 on the circular buffer, there should be one
DMA buffer, not two. The second zero-length buffer would break the
lpuart driver, transfer would never complete.
Signed-off-by: Aaron Brice <aaron.brice@datasoft.com>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 662e1cb2f3a8..d45087665a6e 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -331,7 +331,7 @@ 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 { |