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serial: 8250: Deduplicate rs485 active_timer assignment 

When rs485 transmission over an 8250 port stops, __stop_tx() assigns
active_timer = NULL before calling __stop_tx_rs485().

That function in turn either assigns active_timer = stop_tx_timer and
rearms the timer (in case a delay_rts_after_send needs to be observed)
or directly calls __do_stop_tx_rs485().

Move the assignment active_timer = NULL to __stop_tx_rs485() into the
branch which directly calls __do_stop_tx_rs485(), thereby avoiding a
duplicate assignment and simplifying the code.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Matwey V. Kornilov <matwey@sai.msu.ru>
Link: https://lore.kernel.org/r/bca638405550eaf92f0c6060b553b687f35885e0.1582895077.git.lukas@wunner.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lukas Wunner 2020-02-28 14:31:05 +01:00 committed by Greg Kroah-Hartman
parent 6d3e54e195
commit 41a70b7f47
1 changed files with 1 additions and 2 deletions
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3
drivers/tty/serial/8250/8250_port.c
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@ -1498,6 +1498,7 @@ static void __stop_tx_rs485(struct uart_8250_port *p)
p->port.rs485.delay_rts_after_send); p->port.rs485.delay_rts_after_send);
} else { } else {
__do_stop_tx_rs485(p); __do_stop_tx_rs485(p);
em485->active_timer = NULL;
} }
} }
@ -1522,8 +1523,6 @@ static inline void __stop_tx(struct uart_8250_port *p)
if ((lsr & BOTH_EMPTY) != BOTH_EMPTY) if ((lsr & BOTH_EMPTY) != BOTH_EMPTY)
return; return;
em485->active_timer = NULL;
__stop_tx_rs485(p); __stop_tx_rs485(p);
} }
__do_stop_tx(p); __do_stop_tx(p);