diff options
| author | Huang Shijie <b32955@freescale.com> | 2013-10-11 12:31:00 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-16 22:19:54 +0200 |
| commit | 947c74eba85bff743bc15adbdd9193ffff60c29f (patch) | |
| tree | 5bd87c7ebff2080ce785ec4b0aaff51e2533e55a /drivers/tty | |
| parent | serial: imx: check the DMA for imx_tx_empty (diff) | |
| download | linux-947c74eba85bff743bc15adbdd9193ffff60c29f.tar.xz 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.c | 2 |
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, |