Commit 947c74eb authored Oct 11, 2013 by Huang Shijie Committed by Greg Kroah-Hartman Oct 16, 2013

serial: imx: fix the wrong number of scatterlist entries when xmit->head is 0



When the (xmit->tail > xmit->head) is true and the xmit->head is 0,
we only need one DMA scatterlist in actually. Current code uses two DMA
scatterlists in this case, this is obviously wrong.

This patch fixes it.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 1ce43e58

drivers/tty/serial/imx.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -532,7 +532,7 @@ static void dma_tx_work(struct work_struct *w)
		return;
		}

		if (xmit->tail > xmit->head) {
		if (xmit->tail > xmit->head && xmit->head > 0) {
		sport->dma_tx_nents = 2;
		sg_init_table(sgl, 2);
		sg_set_buf(sgl, xmit->buf + xmit->tail,