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serial: imx: dma_unmap_sg buffers on shutdown 

This properly unmaps DMA SG on device shutdown.

Reported-by: Nandor Han <nandor.han@ge.com>
Suggested-by: Nandor Han <nandor.han@ge.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sebastian Reichel 2018-05-07 23:36:10 +02:00 committed by Greg Kroah-Hartman
parent 676a31d8cb
commit 7722c24091
1 changed files with 10 additions and 2 deletions
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12
drivers/tty/serial/imx.c
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@ -1425,10 +1425,18 @@ static void imx_uart_shutdown(struct uart_port *port)
u32 ucr1, ucr2;
if (sport->dma_is_enabled) {
sport->dma_is_rxing = 0;
sport->dma_is_txing = 0;
dmaengine_terminate_sync(sport->dma_chan_tx);
if (sport->dma_is_txing) {
dma_unmap_sg(sport->port.dev, &sport->tx_sgl[0],
sport->dma_tx_nents, DMA_TO_DEVICE);
sport->dma_is_txing = 0;
}
dmaengine_terminate_sync(sport->dma_chan_rx);
if (sport->dma_is_rxing) {
dma_unmap_sg(sport->port.dev, &sport->rx_sgl,
1, DMA_FROM_DEVICE);
sport->dma_is_rxing = 0;
}
spin_lock_irqsave(&sport->port.lock, flags);
imx_uart_stop_tx(port);