UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

serial: imx: simplify check that prevents starting PIO when DMA is in use 

The original code looks as follows:

	if (sport->dma_is_enabled) {
		... make sure TX DMA is running, i.e. .dma_is_txing = 1
	}

	if (sport->dma_is_txing)
		return;

As .dma_is_txing can only be true if .dma_is_enabled is, the return can
go at the end of the first if body without an additional check.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Uwe Kleine-König 2018-03-02 11:07:22 +01:00 committed by Greg Kroah-Hartman
parent 686351f342
commit 0c54922384
1 changed files with 1 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/tty/serial/imx.c
View File

@ -504,10 +504,9 @@ static inline void imx_transmit_buffer(struct imx_port *sport)
imx_uart_writel(sport, temp, UCR1);
imx_dma_tx(sport);
}
}
if (sport->dma_is_txing)
return;
}
while (!uart_circ_empty(xmit) &&
!(imx_uart_readl(sport, uts_reg(sport)) & UTS_TXFULL)) {