From: Pradeep Goudagunta Date: Fri, 6 Jun 2014 11:18:09 +0000 (+0530) Subject: serial: tegra: ack the rx dma desc after transfer terminated X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=b31245b9420731cc62bb1eea0a2240b3e90a2e78;p=deliverable%2Flinux.git serial: tegra: ack the rx dma desc after transfer terminated The Rx dma descriptor allocated without the DMA_ACK flags so that once after tarnsfer done or terminated, client can ack the descriptor to free it for later use. If the Rx DMA is terminated for some reason then rx-dma descriptor is not getting acked which causes the memory leak and list of usage desc to grow continuously. Hence, acknowledge the rx-dma descriptor once transfer is terminated to avoid memory leak and desc list to grow. Signed-off-by: Laxman Dewangan Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index 117d8d1382f9..53d7c31ce098 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -602,6 +602,7 @@ static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup, dmaengine_terminate_all(tup->rx_dma_chan); dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state); + async_tx_ack(tup->rx_dma_desc); count = tup->rx_bytes_requested - state.residue; /* If we are here, DMA is stopped */