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tty: serial: clean up stop-tx part in altera_uart_tx_chars()

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[ Upstream commit d9c128117d ]

The "stop TX" path in altera_uart_tx_chars() is open-coded, so:
* use uart_circ_empty() to check if the buffer is empty, and
* when true, call altera_uart_stop_tx().

Cc: Tobias Klauser <tklauser@distanz.ch>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Acked-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220920052049.20507-3-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 1307c5d33c ("serial: altera_uart: fix locking in polling mode")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiri Slaby 2022-09-20 07:20:42 +02:00 committed by Greg Kroah-Hartman
parent 6f7d82380f
commit b133b45ba6
1 changed files with 2 additions and 4 deletions
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6
drivers/tty/serial/altera_uart.c
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@ -272,10 +272,8 @@ static void altera_uart_tx_chars(struct altera_uart *pp)
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (xmit->head == xmit->tail) {
pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
altera_uart_update_ctrl_reg(pp);
}
if (uart_circ_empty(xmit))
altera_uart_stop_tx(port);
}
static irqreturn_t altera_uart_interrupt(int irq, void *data)