serial: imx: drop useless member from driver data

The wait queue was only initialized and then checked if it contains
active jobs but a job is never added. The last real user was removed
with commit 9d297239b8cb ("serial: imx-serial - update UART IMX driver
to use cyclic DMA").

Further there is no need to release the lock for the check if the port
should be woken up, (and IMHO there never was) so drop the unlock/lock
pair in dma_tx_callback(), too.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 80934e7..3964ae5 100644 (file)
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -226,7 +226,6 @@ struct imx_port {
        dma_cookie_t            rx_cookie;
        unsigned int            tx_bytes;
        unsigned int            dma_tx_nents;
-       wait_queue_head_t       dma_wait;
        unsigned int            saved_reg[10];
        bool                    context_saved;
 };
@@ -498,20 +497,12 @@ static void dma_tx_callback(void *data)
 
        sport->dma_is_txing = 0;
 
-       spin_unlock_irqrestore(&sport->port.lock, flags);
-
        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
                uart_write_wakeup(&sport->port);
 
-       if (waitqueue_active(&sport->dma_wait)) {
-               wake_up(&sport->dma_wait);
-               dev_dbg(sport->port.dev, "exit in %s.\n", __func__);
-               return;
-       }
-
-       spin_lock_irqsave(&sport->port.lock, flags);
        if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port))
                imx_dma_tx(sport);
+
        spin_unlock_irqrestore(&sport->port.lock, flags);
 }
 
@@ -1208,8 +1199,6 @@ static void imx_enable_dma(struct imx_port *sport)
 {
        unsigned long temp;
 
-       init_waitqueue_head(&sport->dma_wait);
-
        /* set UCR1 */
        temp = readl(sport->port.membase + UCR1);
        temp |= UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN;