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sc16is7xx: move RTS delay to workqueue 

Instead of spinning under port->lock let's just sleep
inside the kthread.  It should be equivalent as TX cannot
proceed when thread is blocked.

Signed-off-by: Jakub Kicinski <kubakici@wp.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jakub Kicinski 2015-05-29 21:20:30 +02:00 committed by Greg Kroah-Hartman
parent 9e6f4ca3e5
commit dbe5a40cba
1 changed files with 6 additions and 8 deletions
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14
drivers/tty/serial/sc16is7xx.c
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@ -650,9 +650,13 @@ static irqreturn_t sc16is7xx_irq(int irq, void *dev_id)
static void sc16is7xx_tx_proc(struct kthread_work *ws)
{
struct sc16is7xx_one *one = to_sc16is7xx_one(ws, tx_work);
struct uart_port *port = &(to_sc16is7xx_one(ws, tx_work)->port);
sc16is7xx_handle_tx(&one->port);
if ((port->rs485.flags & SER_RS485_ENABLED) &&
(port->rs485.delay_rts_before_send > 0))
msleep(port->rs485.delay_rts_before_send);
sc16is7xx_handle_tx(port);
}
static void sc16is7xx_stop_tx(struct uart_port* port)
@ -677,12 +681,6 @@ static void sc16is7xx_start_tx(struct uart_port *port)
struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
/* handle rs485 */
if ((port->rs485.flags & SER_RS485_ENABLED) &&
(port->rs485.delay_rts_before_send > 0)) {
mdelay(port->rs485.delay_rts_before_send);
}
queue_kthread_work(&s->kworker, &one->tx_work);
}