From: Stefan Agner Date: Sat, 10 Jan 2015 08:33:46 +0000 (+0100) Subject: serial: fsl_lpuart: update RX timer on successful DMA transfer X-Git-Tag: v4.0-rc1~81^2~57 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=011f5bde62890c39440859c8077a0a5a6aca316d;p=linux.git serial: fsl_lpuart: update RX timer on successful DMA transfer To end a DMA transfer which did not consume a whole buffer (e.g. one character only), a RX timer is used. When lots of data are received the DMA transfer will complete and setup another DMA transfer, which in turn might complete again. In this cases, it is not necessary to abort the DMA transfers using the RX timer. This change pushes the RX timer timeout into the future each time a DMA transfer completed. Aborting the DMA was not very harmful, since the next received character lead to setup of another RX DMA. Signed-off-by: Stefan Agner Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 0ea0af76cb9a..914f9a2a0157 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -462,6 +462,7 @@ static void lpuart_dma_rx_complete(void *arg) unsigned long flags; async_tx_ack(sport->dma_rx_desc); + mod_timer(&sport->lpuart_timer, jiffies + sport->dma_rx_timeout); spin_lock_irqsave(&sport->port.lock, flags);