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Commit bbcb2b90 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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USB: serial: allow drivers to define bulk buffer sizes 



Allow drivers to define custom bulk in/out buffer sizes in struct
usb_serial_driver. If not set, fall back to the default buffer size
which matches the endpoint size.

Three drivers are currently freeing the pre-allocated buffers and
allocating larger ones to achieve this at port probe (ftdi_sio) or even
at port open (ipaq and iuu_phoenix), which needless to say is suboptimal.

Signed-off-by: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 317149c6

drivers/usb/serial/ftdi_sio.c

+1 −15
Original line number Diff line number Diff line
@@ -768,9 +768,6 @@ static const char *ftdi_chip_name[] = { 
};





/* Constants for read urb and write urb */

#define BUFSZ 512



/* Used for TIOCMIWAIT */

#define FTDI_STATUS_B0_MASK	(FTDI_RS0_CTS | FTDI_RS0_DSR | FTDI_RS0_RI | FTDI_RS0_RLSD)

#define FTDI_STATUS_B1_MASK	(FTDI_RS_BI)
@@ -821,6 +818,7 @@ static struct usb_serial_driver ftdi_sio_device = { 
	.usb_driver = 		&ftdi_driver,

	.id_table =		id_table_combined,

	.num_ports =		1,

	.bulk_in_size =		512,

	.probe =		ftdi_sio_probe,

	.port_probe =		ftdi_sio_port_probe,

	.port_remove =		ftdi_sio_port_remove,
@@ -1552,18 +1550,6 @@ static int ftdi_sio_port_probe(struct usb_serial_port *port) 
	if (quirk && quirk->port_probe)

		quirk->port_probe(priv);



	/* Increase the size of read buffers */

	kfree(port->bulk_in_buffer);

	port->bulk_in_buffer = kmalloc(BUFSZ, GFP_KERNEL);

	if (!port->bulk_in_buffer) {

		kfree(priv);

		return -ENOMEM;

	}

	if (port->read_urb) {

		port->read_urb->transfer_buffer = port->bulk_in_buffer;

		port->read_urb->transfer_buffer_length = BUFSZ;

	}



	priv->port = port;



	/* Free port's existing write urb and transfer buffer. */

drivers/usb/serial/ipaq.c

+2 −26
Original line number Diff line number Diff line
@@ -571,6 +571,8 @@ static struct usb_serial_driver ipaq_device = { 
	.description =		"PocketPC PDA",

	.usb_driver = 		&ipaq_driver,

	.id_table =		ipaq_id_table,

	.bulk_in_size =		URBDATA_SIZE,

	.bulk_out_size =	URBDATA_SIZE,

	.open =			ipaq_open,

	.close =		ipaq_close,

	.attach =		ipaq_startup,
@@ -628,32 +630,6 @@ static int ipaq_open(struct tty_struct *tty, 
		priv->free_len += PACKET_SIZE;

	}



	/*

	 * Lose the small buffers usbserial provides. Make larger ones.

	 */



	kfree(port->bulk_in_buffer);

	kfree(port->bulk_out_buffer);

	/* make sure the generic serial code knows */

	port->bulk_out_buffer = NULL;



	port->bulk_in_buffer = kmalloc(URBDATA_SIZE, GFP_KERNEL);

	if (port->bulk_in_buffer == NULL)

		goto enomem;



	port->bulk_out_buffer = kmalloc(URBDATA_SIZE, GFP_KERNEL);

	if (port->bulk_out_buffer == NULL) {

		/* the buffer is useless, free it */

		kfree(port->bulk_in_buffer);

		port->bulk_in_buffer = NULL;

		goto enomem;

	}

	port->read_urb->transfer_buffer = port->bulk_in_buffer;

	port->write_urb->transfer_buffer = port->bulk_out_buffer;

	port->read_urb->transfer_buffer_length = URBDATA_SIZE;

	port->bulk_out_size = port->write_urb->transfer_buffer_length

							= URBDATA_SIZE;



	msleep(1000*initial_wait);



	/*

drivers/usb/serial/iuu_phoenix.c

+2 −28
Original line number Diff line number Diff line
@@ -1044,34 +1044,6 @@ static int iuu_open(struct tty_struct *tty, struct usb_serial_port *port) 
	if (buf == NULL)

		return -ENOMEM;



	/* fixup the endpoint buffer size */

	kfree(port->bulk_out_buffer);

	port->bulk_out_buffer = kmalloc(512, GFP_KERNEL);

	port->bulk_out_size = 512;

	kfree(port->bulk_in_buffer);

	port->bulk_in_buffer = kmalloc(512, GFP_KERNEL);

	port->bulk_in_size = 512;



	if (!port->bulk_out_buffer || !port->bulk_in_buffer) {

		kfree(port->bulk_out_buffer);

		kfree(port->bulk_in_buffer);

		kfree(buf);

		return -ENOMEM;

	}



	usb_fill_bulk_urb(port->write_urb, port->serial->dev,

			  usb_sndbulkpipe(port->serial->dev,

					  port->bulk_out_endpointAddress),

			  port->bulk_out_buffer, 512,

			  NULL, NULL);





	usb_fill_bulk_urb(port->read_urb, port->serial->dev,

			  usb_rcvbulkpipe(port->serial->dev,

					  port->bulk_in_endpointAddress),

			  port->bulk_in_buffer, 512,

			  NULL, NULL);



	priv->poll = 0;



	/* initialize writebuf */
@@ -1277,6 +1249,8 @@ static struct usb_serial_driver iuu_device = { 
		   },

	.id_table = id_table,

	.num_ports = 1,

	.bulk_in_size = 512,

	.bulk_out_size = 512,

	.port_probe = iuu_create_sysfs_attrs,

	.port_remove = iuu_remove_sysfs_attrs,

	.open = iuu_open,

drivers/usb/serial/usb-serial.c

+6 −2
Original line number Diff line number Diff line
@@ -901,6 +901,8 @@ int usb_serial_probe(struct usb_interface *interface, 
			dev_err(&interface->dev, "No free urbs available\n");

			goto probe_error;

		}

		buffer_size = serial->type->bulk_in_size;

		if (!buffer_size)

			buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);

		port->bulk_in_size = buffer_size;

		port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
@@ -927,6 +929,8 @@ int usb_serial_probe(struct usb_interface *interface, 
		}

		if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))

			goto probe_error;

		buffer_size = serial->type->bulk_out_size;

		if (!buffer_size)

			buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);

		port->bulk_out_size = buffer_size;

		port->bulk_out_endpointAddress = endpoint->bEndpointAddress;

include/linux/usb/serial.h

+5 −0
Original line number Diff line number Diff line
@@ -179,6 +179,8 @@ static inline void usb_set_serial_data(struct usb_serial *serial, void *data) 
 * @id_table: pointer to a list of usb_device_id structures that define all

 *	of the devices this structure can support.

 * @num_ports: the number of different ports this device will have.

 * @bulk_in_size: bytes to allocate for bulk-in buffer (0 = end-point size)

 * @bulk_out_size: bytes to allocate for bulk-out buffer (0 = end-point size)

 * @calc_num_ports: pointer to a function to determine how many ports this

 *	device has dynamically.  It will be called after the probe()

 *	callback is called, but before attach()
@@ -223,6 +225,9 @@ struct usb_serial_driver { 
	struct usb_dynids	dynids;

	int			max_in_flight_urbs;



	size_t			bulk_in_size;

	size_t			bulk_out_size;



	int (*probe)(struct usb_serial *serial, const struct usb_device_id *id);

	int (*attach)(struct usb_serial *serial);

	int (*calc_num_ports) (struct usb_serial *serial);