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serial: imx: TX DMA: clean up sg initialization 

Inverting the logic of the if statement for the sg initialization
makes the if statement easier and better to read.

No functional change.

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dirk Behme 2014-12-09 18:11:25 +09:00 committed by Greg Kroah-Hartman
parent 55c3cb1358
commit 7942f8577f
1 changed files with 4 additions and 4 deletions
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8
drivers/tty/serial/imx.c
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@ -539,15 +539,15 @@ static void imx_dma_tx(struct imx_port *sport)
sport->tx_bytes = uart_circ_chars_pending(xmit);
if (xmit->tail > xmit->head && xmit->head > 0) {
if (xmit->tail < xmit->head) {
sport->dma_tx_nents = 1;
sg_init_one(sgl, xmit->buf + xmit->tail, sport->tx_bytes);
} else {
sport->dma_tx_nents = 2;
sg_init_table(sgl, 2);
sg_set_buf(sgl, xmit->buf + xmit->tail,
UART_XMIT_SIZE - xmit->tail);
sg_set_buf(sgl + 1, xmit->buf, xmit->head);
} else {
sport->dma_tx_nents = 1;
sg_init_one(sgl, xmit->buf + xmit->tail, sport->tx_bytes);
}
ret = dma_map_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);