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serial: tegra: ack the rx dma desc after transfer terminated

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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 <ldewangan@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pradeep Goudagunta 2014-06-06 16:48:09 +05:30 committed by Greg Kroah-Hartman
parent 5e3dbfca3b
commit b31245b942
1 changed files with 1 additions and 0 deletions
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1
drivers/tty/serial/serial-tegra.c
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@ -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 */