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serial: imx: unmap scatter gather list in imx_flush_buffer

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First, reformat the code to exit immediately. This allows us to add
more code in more readable format.

In case the TX DMA was still running, remove and disable it's resources.

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dirk Behme 2014-12-09 18:11:27 +09:00 • committed by Greg Kroah-Hartman
parent 2464982174
commit 82e86ae941
1 changed files with 10 additions and 3 deletions
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13
drivers/tty/serial/imx.c
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@ -1250,10 +1250,17 @@ static void imx_shutdown(struct uart_port *port)
static void imx_flush_buffer(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
struct scatterlist *sgl = &sport->tx_sgl[0];
if (sport->dma_is_enabled) {
sport->tx_bytes = 0;
dmaengine_terminate_all(sport->dma_chan_tx);
if (!sport->dma_chan_tx)
return;
sport->tx_bytes = 0;
dmaengine_terminate_all(sport->dma_chan_tx);
if (sport->dma_is_txing) {
dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents,
DMA_TO_DEVICE);
sport->dma_is_txing = false;
}
}