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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 <m.szyprowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marek Szyprowski 2017-04-03 08:21:01 +02:00 committed by Greg Kroah-Hartman
parent 500fcc08a3
commit 469f813ffe
1 changed files with 0 additions and 4 deletions
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4
drivers/tty/serial/samsung.c
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@ -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;