[PATCH 3/4] serial: imx: fix the wrong number of scatterlist entries when xmit->head is 0
Huang Shijie
b32955 at freescale.com
Fri Oct 11 06:31:00 EDT 2013
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 at freescale.com>
---
drivers/tty/serial/imx.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index c6c3b16..cadf7e5 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -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,
--
1.7.2.rc3
More information about the linux-arm-kernel
mailing list