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authorHuang Shijie <b32955@freescale.com>2013-10-11 18:31:00 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-16 13:19:54 -0700
commit947c74eba85bff743bc15adbdd9193ffff60c29f (patch)
tree5bd87c7ebff2080ce785ec4b0aaff51e2533e55a /drivers/tty
parent1ce43e58d4d57acc9782d97270ec70a91a177abc (diff)
downloadblackbird-op-linux-947c74eba85bff743bc15adbdd9193ffff60c29f.tar.gz
blackbird-op-linux-947c74eba85bff743bc15adbdd9193ffff60c29f.zip
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>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/imx.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index c6c3b160dac7..cadf7e5848b2 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,
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