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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: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Johan Hovold 2010-03-17 23:00:37 +01:00 committed by Greg Kroah-Hartman
parent 317149c655
commit bbcb2b9074
5 changed files with 16 additions and 71 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/usb/serial/ftdi_sio.c
View File

@ -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. */

28
drivers/usb/serial/ipaq.c
View File

@ -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);
/*

30
drivers/usb/serial/iuu_phoenix.c
View File

@ -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,

4
drivers/usb/serial/usb-serial.c
View File

@ -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;

5
include/linux/usb/serial.h
View File

@ -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);