tty/serial: at91: fix typo and indentation

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 22 insertions, 18 deletions

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 9e0c63676f0a..846552bff67d 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -738,7 +738,11 @@ static void atmel_complete_tx_dma(void *arg)
         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
                 uart_write_wakeup(port);
 
-        /* Do we really need this? */
+        /*
+         * xmit is a circular buffer so, if we have just send data from
+         * xmit->tail to the end of xmit->buf, now we have to transmit the
+         * remaining data from the beginning of xmit->buf to xmit->head.
+         */
         if (!uart_circ_empty(xmit))
                 tasklet_schedule(&atmel_port->tasklet);
 
@@ -797,11 +801,11 @@ static void atmel_tx_dma(struct uart_port *port)
                 BUG_ON(!sg_dma_len(sg));
 
                 desc = dmaengine_prep_slave_sg(chan,
-                                                sg,
-                                                1,
-                                                DMA_MEM_TO_DEV,
-                                                DMA_PREP_INTERRUPT |
-                                                DMA_CTRL_ACK);
+                                               sg,
+                                               1,
+                                               DMA_MEM_TO_DEV,
+                                               DMA_PREP_INTERRUPT |
+                                               DMA_CTRL_ACK);
                 if (!desc) {
                         dev_err(port->dev, "Failed to send via dma!\n");
                         return;
@@ -1025,13 +1029,13 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
         /* UART circular rx buffer is an aligned page. */
         BUG_ON((int)port->state->xmit.buf & ~PAGE_MASK);
         sg_set_page(&atmel_port->sg_rx,
-                        virt_to_page(ring->buf),
-                        ATMEL_SERIAL_RINGSIZE,
-                        (int)ring->buf & ~PAGE_MASK);
-                        nent = dma_map_sg(port->dev,
-                                        &atmel_port->sg_rx,
-                                        1,
-                                        DMA_FROM_DEVICE);
+                    virt_to_page(ring->buf),
+                    ATMEL_SERIAL_RINGSIZE,
+                    (int)ring->buf & ~PAGE_MASK);
+        nent = dma_map_sg(port->dev,
+                          &atmel_port->sg_rx,
+                          1,
+                          DMA_FROM_DEVICE);
 
         if (!nent) {
                 dev_dbg(port->dev, "need to release resource of dma\n");
@@ -1060,11 +1064,11 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
          * each one is half ring buffer size
          */
         desc = dmaengine_prep_dma_cyclic(atmel_port->chan_rx,
-                                sg_dma_address(&atmel_port->sg_rx),
-                                sg_dma_len(&atmel_port->sg_rx),
-                                sg_dma_len(&atmel_port->sg_rx)/2,
-                                DMA_DEV_TO_MEM,
-                                DMA_PREP_INTERRUPT);
+                                         sg_dma_address(&atmel_port->sg_rx),
+                                         sg_dma_len(&atmel_port->sg_rx),
+                                         sg_dma_len(&atmel_port->sg_rx)/2,
+                                         DMA_DEV_TO_MEM,
+                                         DMA_PREP_INTERRUPT);
         desc->callback = atmel_complete_rx_dma;
         desc->callback_param = port;
         atmel_port->desc_rx = desc;