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Commit a0104085 authored by Jakub Kicinski's avatar Jakub Kicinski Committed by Greg Kroah-Hartman
Browse files

sc16is7xx: use kworker for md_proc 



Convert md_proc into general async reconfiguration procedure.

Signed-off-by: default avatarJakub Kicinski <kubakici@wp.pl>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent dbe5a40c

drivers/tty/serial/sc16is7xx.c

+31 −16
Original line number Diff line number Diff line
@@ -301,10 +301,17 @@ struct sc16is7xx_devtype { 
	int	nr_uart;

};



#define SC16IS7XX_RECONF_MD		(1 << 0)



struct sc16is7xx_one_config {

	unsigned int			flags;

};



struct sc16is7xx_one {

	struct uart_port		port;

	struct kthread_work		tx_work;

	struct work_struct		md_work;

	struct kthread_work		reg_work;

	struct sc16is7xx_one_config	config;

};



struct sc16is7xx_port {
@@ -659,6 +666,24 @@ static void sc16is7xx_tx_proc(struct kthread_work *ws) 
	sc16is7xx_handle_tx(port);

}



static void sc16is7xx_reg_proc(struct kthread_work *ws)

{

	struct sc16is7xx_one *one = to_sc16is7xx_one(ws, reg_work);

	struct sc16is7xx_one_config config;

	unsigned long irqflags;



	spin_lock_irqsave(&one->port.lock, irqflags);

	config = one->config;

	memset(&one->config, 0, sizeof(one->config));

	spin_unlock_irqrestore(&one->port.lock, irqflags);



	if (config.flags & SC16IS7XX_RECONF_MD)

		sc16is7xx_port_update(&one->port, SC16IS7XX_MCR_REG,

				      SC16IS7XX_MCR_LOOP_BIT,

				      (one->port.mctrl & TIOCM_LOOP) ?

				      SC16IS7XX_MCR_LOOP_BIT : 0);

}



static void sc16is7xx_stop_tx(struct uart_port* port)

{

	sc16is7xx_port_update(port, SC16IS7XX_IER_REG,
@@ -701,21 +726,13 @@ static unsigned int sc16is7xx_get_mctrl(struct uart_port *port) 
	return TIOCM_DSR | TIOCM_CAR;

}



static void sc16is7xx_md_proc(struct work_struct *ws)

{

	struct sc16is7xx_one *one = to_sc16is7xx_one(ws, md_work);



	sc16is7xx_port_update(&one->port, SC16IS7XX_MCR_REG,

			      SC16IS7XX_MCR_LOOP_BIT,

			      (one->port.mctrl & TIOCM_LOOP) ?

				      SC16IS7XX_MCR_LOOP_BIT : 0);

}



static void sc16is7xx_set_mctrl(struct uart_port *port, unsigned int mctrl)

{

	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);

	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);



	schedule_work(&one->md_work);

	one->config.flags |= SC16IS7XX_RECONF_MD;

	queue_kthread_work(&s->kworker, &one->reg_work);

}



static void sc16is7xx_break_ctl(struct uart_port *port, int break_state)
@@ -1132,10 +1149,9 @@ static int sc16is7xx_probe(struct device *dev, 
		sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_EFCR_REG,

				     SC16IS7XX_EFCR_RXDISABLE_BIT |

				     SC16IS7XX_EFCR_TXDISABLE_BIT);

		/* Initialize queue for start TX */

		/* Initialize kthread work structs */

		init_kthread_work(&s->p[i].tx_work, sc16is7xx_tx_proc);

		/* Initialize queue for changing mode */

		INIT_WORK(&s->p[i].md_work, sc16is7xx_md_proc);

		init_kthread_work(&s->p[i].reg_work, sc16is7xx_reg_proc);

		/* Register port */

		uart_add_one_port(&s->uart, &s->p[i].port);

		/* Go to suspend mode */
@@ -1180,7 +1196,6 @@ static int sc16is7xx_remove(struct device *dev) 
#endif



	for (i = 0; i < s->uart.nr; i++) {

		cancel_work_sync(&s->p[i].md_work);

		uart_remove_one_port(&s->uart, &s->p[i].port);

		sc16is7xx_power(&s->p[i].port, 0);

	}