Hi Jiri,
On 22.11.2019 13:08, Jiri Slaby wrote:
> On 22. 11. 19, 13:04, Chen Wandun wrote:
>> Fixes gcc '-Wunused-but-set-variable' warning:
>>
>> drivers/tty/serial/samsung_tty.c: In function s3c24xx_serial_rx_chars_dma:
>> drivers/tty/serial/samsung_tty.c:549:24: warning: variable ufstat set but not used [-Wunused-but-set-variable]
>>
>> Signed-off-by: Chen Wandun <chenwandun@xxxxxxxxxx>
>> ---
>> drivers/tty/serial/samsung_tty.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
>> index 83fd516..ab3c7d1 100644
>> --- a/drivers/tty/serial/samsung_tty.c
>> +++ b/drivers/tty/serial/samsung_tty.c
>> @@ -546,7 +546,7 @@ static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport);
>>
>> static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
>> {
>> - unsigned int utrstat, ufstat, received;
>> + unsigned int utrstat, received;
>> struct s3c24xx_uart_port *ourport = dev_id;
>> struct uart_port *port = &ourport->port;
>> struct s3c24xx_uart_dma *dma = ourport->dma;
>> @@ -556,7 +556,7 @@ static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
>> struct dma_tx_state state;
>>
>> utrstat = rd_regl(port, S3C2410_UTRSTAT);
>> - ufstat = rd_regl(port, S3C2410_UFSTAT);
>> + rd_regl(port, S3C2410_UFSTAT);
> The question (CCed some samsung people) is whether we have to spend the
> cycles reading the register at all? Does it have side-effects?
Reading this register doesn't have any side effects, so it is safe to
remove rd_regl(port, S3C2410_UFSTAT) at all in this function. Tested on
Exynos5422-based OdroidXU3 board.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
