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authorMarek Szyprowski <m.szyprowski@samsung.com>2017-04-03 08:21:01 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-04-08 18:58:52 +0200
commit469f813ffe1ab74a9115dbd06ea3026e50ea6a54 (patch)
tree95c648d13e92bc489adbafddb4c8a782106ed0cd /drivers/tty
parent500fcc08a32bfd54f11951ba81530775df15c474 (diff)
downloadlinux-469f813ffe1ab74a9115dbd06ea3026e50ea6a54.tar.bz2
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>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/samsung.c4
1 files changed, 0 insertions, 4 deletions
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;