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serial: mxs-auart: unmap the scatter list before we copy the data 

We should first unmap the DMA scatter list for receiving data, and
then copy the data from the DMA buffer.

The old code misses unmap the scatter list for RX. This patch fixes it.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Tested-by: Lauri Hintsala <lauri.hintsala@bluegiga.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Huang Shijie 2012-11-22 15:06:30 +08:00 committed by Greg Kroah-Hartman
parent a5919442bc
commit d7ffb93290
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/mxs-auart.c
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@ -461,6 +461,8 @@ static void dma_rx_callback(void *arg)
int count;
u32 stat;
dma_unmap_sg(s->dev, &s->rx_sgl, 1, DMA_FROM_DEVICE);
stat = readl(s->port.membase + AUART_STAT);
stat &= ~(AUART_STAT_OERR | AUART_STAT_BERR |
AUART_STAT_PERR | AUART_STAT_FERR);