Commit 28f27dcb authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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USB: oti6858: use port write fifo 



Kill private write fifo and use port fifo instead (protected under
port lock).

Compile-only tested.

Signed-off-by: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent e3c1803f

drivers/usb/serial/oti6858.c

+25 −37
Original line number Diff line number Diff line
@@ -76,8 +76,6 @@ static struct usb_driver oti6858_driver = { 


static int debug;



#define OTI6858_FIFO_SIZE		1024



/* requests */

#define	OTI6858_REQ_GET_STATUS		(USB_DIR_IN | USB_TYPE_VENDOR | 0x00)

#define	OTI6858_REQ_T_GET_STATUS	0x01
@@ -180,7 +178,6 @@ static struct usb_serial_driver oti6858_device = { 
struct oti6858_private {

	spinlock_t lock;



	struct kfifo write_fifo;

	struct oti6858_control_pkt status;



	struct {
@@ -293,9 +290,12 @@ static void send_data(struct work_struct *work) 
		return;

	}

	priv->flags.write_urb_in_use = 1;



	count = kfifo_len(&priv->write_fifo);

	spin_unlock_irqrestore(&priv->lock, flags);



	spin_lock_irqsave(&port->lock, flags);

	count = kfifo_len(&port->write_fifo);

	spin_unlock_irqrestore(&port->lock, flags);



	if (count > port->bulk_out_size)

		count = port->bulk_out_size;
@@ -329,9 +329,9 @@ static void send_data(struct work_struct *work) 
		return;

	}



	count = kfifo_out_locked(&priv->write_fifo,

	count = kfifo_out_locked(&port->write_fifo,

					port->write_urb->transfer_buffer,

					count, &priv->lock);

					count, &port->lock);

	port->write_urb->transfer_buffer_length = count;

	port->write_urb->dev = port->serial->dev;

	result = usb_submit_urb(port->write_urb, GFP_NOIO);
@@ -354,11 +354,6 @@ static int oti6858_startup(struct usb_serial *serial) 
		priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL);

		if (!priv)

			break;

		if (kfifo_alloc(&priv->write_fifo, OTI6858_FIFO_SIZE,

								GFP_KERNEL)) {

			kfree(priv);

			break;

		}



		spin_lock_init(&priv->lock);

		init_waitqueue_head(&priv->intr_wait);
@@ -375,7 +370,6 @@ static int oti6858_startup(struct usb_serial *serial) 


	for (--i; i >= 0; --i) {

		priv = usb_get_serial_port_data(serial->port[i]);

		kfifo_free(&priv->write_fifo);

		kfree(priv);

		usb_set_serial_port_data(serial->port[i], NULL);

	}
@@ -385,14 +379,12 @@ static int oti6858_startup(struct usb_serial *serial) 
static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,

			const unsigned char *buf, int count)

{

	struct oti6858_private *priv = usb_get_serial_port_data(port);



	dbg("%s(port = %d, count = %d)", __func__, port->number, count);



	if (!count)

		return count;



	count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);

	count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);



	return count;

}
@@ -400,15 +392,14 @@ static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 
static int oti6858_write_room(struct tty_struct *tty)

{

	struct usb_serial_port *port = tty->driver_data;

	struct oti6858_private *priv = usb_get_serial_port_data(port);

	int room = 0;

	unsigned long flags;



	dbg("%s(port = %d)", __func__, port->number);



	spin_lock_irqsave(&priv->lock, flags);

	room = kfifo_avail(&priv->write_fifo);

	spin_unlock_irqrestore(&priv->lock, flags);

	spin_lock_irqsave(&port->lock, flags);

	room = kfifo_avail(&port->write_fifo);

	spin_unlock_irqrestore(&port->lock, flags);



	return room;

}
@@ -416,15 +407,14 @@ static int oti6858_write_room(struct tty_struct *tty) 
static int oti6858_chars_in_buffer(struct tty_struct *tty)

{

	struct usb_serial_port *port = tty->driver_data;

	struct oti6858_private *priv = usb_get_serial_port_data(port);

	int chars = 0;

	unsigned long flags;



	dbg("%s(port = %d)", __func__, port->number);



	spin_lock_irqsave(&priv->lock, flags);

	chars = kfifo_len(&priv->write_fifo);

	spin_unlock_irqrestore(&priv->lock, flags);

	spin_lock_irqsave(&port->lock, flags);

	chars = kfifo_len(&port->write_fifo);

	spin_unlock_irqrestore(&port->lock, flags);



	return chars;

}
@@ -615,10 +605,10 @@ static void oti6858_close(struct usb_serial_port *port) 


	dbg("%s(port = %d)", __func__, port->number);



	spin_lock_irqsave(&priv->lock, flags);

	spin_lock_irqsave(&port->lock, flags);

	/* clear out any remaining data in the buffer */

	kfifo_reset_out(&priv->write_fifo);

	spin_unlock_irqrestore(&priv->lock, flags);

	kfifo_reset_out(&port->write_fifo);

	spin_unlock_irqrestore(&port->lock, flags);



	dbg("%s(): after buf_clear()", __func__);
@@ -760,18 +750,12 @@ static int oti6858_ioctl(struct tty_struct *tty, struct file *file, 


static void oti6858_release(struct usb_serial *serial)

{

	struct oti6858_private *priv;

	int i;



	dbg("%s()", __func__);



	for (i = 0; i < serial->num_ports; ++i) {

		priv = usb_get_serial_port_data(serial->port[i]);

		if (priv) {

			kfifo_free(&priv->write_fifo);

			kfree(priv);

		}

	}

	for (i = 0; i < serial->num_ports; ++i)

		kfree(usb_get_serial_port_data(serial->port[i]));

}



static void oti6858_read_int_callback(struct urb *urb)
@@ -864,10 +848,14 @@ static void oti6858_read_int_callback(struct urb *urb) 
		}

	} else if (!transient) {

		unsigned long flags;

		int count;



		spin_lock_irqsave(&port->lock, flags);

		count = kfifo_len(&port->write_fifo);

		spin_unlock_irqrestore(&port->lock, flags);



		spin_lock_irqsave(&priv->lock, flags);

		if (priv->flags.write_urb_in_use == 0

				&& kfifo_len(&priv->write_fifo) != 0) {

		if (priv->flags.write_urb_in_use == 0 && count != 0) {

			schedule_delayed_work(&priv->delayed_write_work, 0);

			resubmit = 0;

		}

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