From 469f813ffe1ab74a9115dbd06ea3026e50ea6a54 Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Mon, 3 Apr 2017 08:21:01 +0200 Subject: serial: samsung: Remove useless spinlock Spinlock taken only for dma_map_single() for TX buffer is completely useless and doesn't protect anything, so remove it to simplify the code. Signed-off-by: Marek Szyprowski Reviewed-by: Krzysztof Kozlowski Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/samsung.c | 4 ---- 1 file changed, 4 deletions(-) (limited to 'drivers/tty/serial/samsung.c') diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index ca0bcd7fd61f..8aca18c4cdea 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -906,13 +906,9 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p) goto err_free_rx; } - spin_lock_irqsave(&p->port.lock, flags); - /* TX buffer */ dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf, UART_XMIT_SIZE, DMA_TO_DEVICE); - - spin_unlock_irqrestore(&p->port.lock, flags); if (dma_mapping_error(p->port.dev, dma->tx_addr)) { ret = -EIO; goto err_unmap_rx; -- cgit v1.2.3