Messages in this thread Patch in this message | | | From | Romain Perier <> | Subject | [PATCH v2 4/6] serial: imx: unmap sg buffers when DMA channel is released | Date | Wed, 5 Jul 2017 15:07:04 +0200 |
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From: Nandor Han <nandor.han@ge.com>
This commits unmaps sg buffers when the DMA channel is released. It also sets to zero `dma_is_rxing` and `dma_is_txing` to state that the corresponding channels cannot transmit/receive data, as these are disabled.
Signed-off-by: Nandor Han <nandor.han@ge.com> Signed-off-by: Romain Perier <romain.perier@collabora.com> --- drivers/tty/serial/imx.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index dd3ebb4..3112d88 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -367,6 +367,12 @@ static void imx_stop_tx_dma(struct imx_port *sport) temp = readl(sport->port.membase + UCR1); temp &= ~UCR1_TDMAEN; writel(temp, sport->port.membase + UCR1); + + 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; + } } static void imx_stop_rx_dma(struct imx_port *sport) @@ -376,6 +382,12 @@ static void imx_stop_rx_dma(struct imx_port *sport) temp = readl(sport->port.membase + UCR1); temp &= ~(UCR1_RDMAEN | UCR1_ATDMAEN); writel(temp, sport->port.membase + UCR1); + + if (sport->dma_is_rxing) { + dma_unmap_sg(sport->port.dev, &sport->rx_sgl, 1, + DMA_FROM_DEVICE); + sport->dma_is_rxing = 0; + } } /* -- 1.8.3.1
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