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USB: serial: omninet: clean up port setup 

These devices use the second bulk-out endpoint for writing. Instead of
using the resources of the second port structure setup by core, use the
new endpoint-remap functionality to simply ignore the first bulk-out
endpoint. This specifically avoids allocating resources for the unused
endpoint.

Note that the disconnect callback was always redundant as all URBs would
have been killed by USB core on disconnect.

Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2017-03-16 17:13:48 +01:00
parent 9525402023
commit 2dc1071b34
1 changed files with 21 additions and 26 deletions
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47
drivers/usb/serial/omninet.c
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@ -36,7 +36,8 @@ static void omninet_write_bulk_callback(struct urb *urb);
static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count);
static int omninet_write_room(struct tty_struct *tty);
static void omninet_disconnect(struct usb_serial *serial);
static int omninet_calc_num_ports(struct usb_serial *serial,
struct usb_serial_endpoints *epds);
static int omninet_port_probe(struct usb_serial_port *port);
static int omninet_port_remove(struct usb_serial_port *port);
@ -54,15 +55,14 @@ static struct usb_serial_driver zyxel_omninet_device = {
},
.description = "ZyXEL - omni.net lcd plus usb",
.id_table = id_table,
.num_ports = 1,
.num_bulk_out = 2,
.calc_num_ports = omninet_calc_num_ports,
.port_probe = omninet_port_probe,
.port_remove = omninet_port_remove,
.write = omninet_write,
.write_room = omninet_write_room,
.write_bulk_callback = omninet_write_bulk_callback,
.process_read_urb = omninet_process_read_urb,
.disconnect = omninet_disconnect,
};
static struct usb_serial_driver * const serial_drivers[] = {
@ -103,6 +103,16 @@ struct omninet_data {
__u8 od_outseq; /* Sequence number for bulk_out URBs */
};
static int omninet_calc_num_ports(struct usb_serial *serial,
struct usb_serial_endpoints *epds)
{
/* We need only the second bulk-out for our single-port device. */
epds->bulk_out[0] = epds->bulk_out[1];
epds->num_bulk_out = 1;
return 1;
}
static int omninet_port_probe(struct usb_serial_port *port)
{
struct omninet_data *od;
@ -150,13 +160,9 @@ static void omninet_process_read_urb(struct urb *urb)
static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count)
{
struct usb_serial *serial = port->serial;
struct usb_serial_port *wport = serial->port[1];
struct omninet_data *od = usb_get_serial_port_data(port);
struct omninet_header *header = (struct omninet_header *)
wport->write_urb->transfer_buffer;
port->write_urb->transfer_buffer;
int result;
if (count == 0) {
@ -171,11 +177,11 @@ static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
count = (count > OMNINET_PAYLOADSIZE) ? OMNINET_PAYLOADSIZE : count;
memcpy(wport->write_urb->transfer_buffer + OMNINET_HEADERLEN,
memcpy(port->write_urb->transfer_buffer + OMNINET_HEADERLEN,
buf, count);
usb_serial_debug_data(&port->dev, __func__, count,
wport->write_urb->transfer_buffer);
port->write_urb->transfer_buffer);
header->oh_seq = od->od_outseq++;
header->oh_len = count;
@ -183,11 +189,11 @@ static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
header->oh_pad = 0x00;
/* send the data out the bulk port, always 64 bytes */
wport->write_urb->transfer_buffer_length = OMNINET_BULKOUTSIZE;
port->write_urb->transfer_buffer_length = OMNINET_BULKOUTSIZE;
result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (result) {
set_bit(0, &wport->write_urbs_free);
set_bit(0, &port->write_urbs_free);
dev_err_console(port,
"%s - failed submitting write urb, error %d\n",
__func__, result);
@ -201,13 +207,10 @@ static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
static int omninet_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
struct usb_serial_port *wport = serial->port[1];
int room = 0; /* Default: no room */
if (test_bit(0, &wport->write_urbs_free))
room = wport->bulk_out_size - OMNINET_HEADERLEN;
if (test_bit(0, &port->write_urbs_free))
room = port->bulk_out_size - OMNINET_HEADERLEN;
dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
@ -231,14 +234,6 @@ static void omninet_write_bulk_callback(struct urb *urb)
usb_serial_port_softint(port);
}
static void omninet_disconnect(struct usb_serial *serial)
{
struct usb_serial_port *wport = serial->port[1];
usb_kill_urb(wport->write_urb);
}
module_usb_serial_driver(serial_drivers, id_table);
MODULE_AUTHOR(DRIVER_AUTHOR);