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tty: serial: amba-pl011: remove set but unused variable

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Fix the following warning:
drivers/tty/serial/amba-pl011.c: In function check_apply_cts_event_workaround:
drivers/tty/serial/amba-pl011.c:1461:15: warning: variable dummy_read set but not used [-Wunused-but-set-variable]

The data read is useless and can be dropped.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Link: https://lore.kernel.org/r/1575619526-34482-1-git-send-email-wangxiongfeng2@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xiongfeng Wang 2019-12-06 16:05:26 +08:00 committed by Greg Kroah-Hartman
parent 98aee0c944
commit 94345aee28
1 changed files with 2 additions and 4 deletions
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6
drivers/tty/serial/amba-pl011.c
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@ -1452,8 +1452,6 @@ static void pl011_modem_status(struct uart_amba_port *uap)
static void check_apply_cts_event_workaround(struct uart_amba_port *uap)
{
unsigned int dummy_read;
if (!uap->vendor->cts_event_workaround)
return;
@ -1465,8 +1463,8 @@ static void check_apply_cts_event_workaround(struct uart_amba_port *uap)
* single apb access will incur 2 pclk(133.12Mhz) delay,
* so add 2 dummy reads
*/
dummy_read = pl011_read(uap, REG_ICR);
dummy_read = pl011_read(uap, REG_ICR);
pl011_read(uap, REG_ICR);
pl011_read(uap, REG_ICR);
}
static irqreturn_t pl011_int(int irq, void *dev_id)