From mboxrd@z Thu Jan 1 00:00:00 1970 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 Message-ID: <20170705130706.10388-5-romain.perier@collabora.com> References: <20170705130706.10388-1-romain.perier@collabora.com> Return-path: In-Reply-To: <20170705130706.10388-1-romain.perier@collabora.com> Sender: linux-kernel-owner@vger.kernel.org To: Greg Kroah-Hartman Cc: linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Nandor Han , Romain Perier List-Id: linux-serial@vger.kernel.org From: Nandor Han 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 Signed-off-by: Romain Perier --- 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