diff options
| author | Dirk Behme | 2014-12-09 10:11:27 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2015-01-09 23:23:07 +0100 |
| commit | 82e86ae941194e6b6278ff67aad257b018e0684f (patch) | |
| tree | 9a9b4b80400cb3de2f8d58750f78f93a566068f0 /drivers/tty/serial/imx.c | |
| parent | serial: imx: unmap sg in case of dmaengine_prep_slave_sg() failure (diff) | |
| download | kernel-qcow2-linux-82e86ae941194e6b6278ff67aad257b018e0684f.tar.gz kernel-qcow2-linux-82e86ae941194e6b6278ff67aad257b018e0684f.tar.xz kernel-qcow2-linux-82e86ae941194e6b6278ff67aad257b018e0684f.zip | |
serial: imx: unmap scatter gather list in imx_flush_buffer
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>
Diffstat (limited to 'drivers/tty/serial/imx.c')
| -rw-r--r-- | drivers/tty/serial/imx.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index b4cf24c64a15..952730ab9067 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -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; } } |