static int gs_start_io(struct gs_port *port)
{
struct list_head *head = &port->read_pool;
struct usb_ep *ep = port->port_usb->out;
int status;
unsigned started;
status = gs_alloc_requests(ep, head, RX_QUEUE_SIZE,
RX_BUF_SIZE, gs_read_complete);
if (status)
return status;
status = gs_alloc_requests(port->port_usb->in, &port->write_pool,
TX_QUEUE_SIZE, TX_BUF_SIZE, gs_write_complete);
if (status) {
gs_free_requests(ep, head);
return status;
}
port->n_read = 0;
started = gs_start_rx(port);
if (started) {
tty_wakeup(port->port_tty);
} else {
gs_free_requests(ep, head);
gs_free_requests(port->port_usb->in, &port->write_pool);
status = -EIO;
}
return status;
}
/*
*alloc read and write request for usb io
*and init this request with read and write complete funciton
*/
static int gs_start_io_mine(struct gs_port *port)
{
struct list_head *head = &port->read_pool;
struct usb_ep *ep = port->port_usb->out;
int status;
unsigned started;
/* Allocate RX and TX I/O buffers. We can't easily do this much
* earlier (with GFP_KERNEL) because the requests are coupled to
* endpoints, as are the packet sizes we'll be using. Different
* configurations may use different endpoints with a given port;
* and high speed vs full speed changes packet sizes too.
*/
status = gs_alloc_requests(ep, head, gs_read_complete,
&port->read_allocated);
if (status)
return status;
status = gs_alloc_requests(port->port_usb->in, &port->write_pool,
gs_write_complete, &port->write_allocated);
if (status) {
gs_free_requests(ep, head, &port->read_allocated);
return status;
}
}
/**
* gs_start_io - start USB I/O streams
* @dev: encapsulates endpoints to use
* Context: holding port_lock; port_tty and port_usb are non-null
*
* We only start I/O when something is connected to both sides of
* this port. If nothing is listening on the host side, we may
* be pointlessly filling up our TX buffers and FIFO.
*/
static int gs_start_io(struct gs_port *port)
{
struct list_head *head;
struct usb_ep *ep;
int status;
unsigned started;
if (!port || !port->port_usb) {
pr_err("Error - port or port->usb is NULL.");
return -EIO;
}
head = &port->read_pool;
ep = port->port_usb->out;
/* Allocate RX and TX I/O buffers. We can't easily do this much
* earlier (with GFP_KERNEL) because the requests are coupled to
* endpoints, as are the packet sizes we'll be using. Different
* configurations may use different endpoints with a given port;
* and high speed vs full speed changes packet sizes too.
*/
status = gs_alloc_requests(ep, head, RX_QUEUE_SIZE, RX_BUF_SIZE,
gs_read_complete, &port->read_allocated);
if (status)
return status;
status = gs_alloc_requests(port->port_usb->in, &port->write_pool,
TX_QUEUE_SIZE, TX_BUF_SIZE, gs_write_complete, &port->write_allocated);
if (status) {
gs_free_requests(ep, head, &port->read_allocated);
return status;
}
/* queue read requests */
port->n_read = 0;
started = gs_start_rx(port);
if (!port->port.tty) {
printk(KERN_ERR "usb:[%s] port_usb or port_tty is NULL!! started(%d)\n",
__func__, started);
return -EIO;
}
/* unblock any pending writes into our circular buffer */
if (started) {
tty_wakeup(port->port.tty);
} else {
gs_free_requests(ep, head, &port->read_allocated);
gs_free_requests(port->port_usb->in, &port->write_pool,
&port->write_allocated);
status = -EIO;
}
return status;
}
/**
* gs_start_io - start USB I/O streams
* @dev: encapsulates endpoints to use
* Context: holding port_lock; port_tty and port_usb are non-null
*
* We only start I/O when something is connected to both sides of
* this port. If nothing is listening on the host side, we may
* be pointlessly filling up our TX buffers and FIFO.
*/
static int gs_start_io(struct gs_port *port)
{
struct list_head *head = &port->read_pool;
struct usb_ep *ep = port->port_usb->out;
int status;
unsigned started;
/* Allocate RX and TX I/O buffers. We can't easily do this much
* earlier (with GFP_KERNEL) because the requests are coupled to
* endpoints, as are the packet sizes we'll be using. Different
* configurations may use different endpoints with a given port;
* and high speed vs full speed changes packet sizes too.
*/
status = gs_alloc_requests(ep, head, RX_QUEUE_SIZE, RX_BUF_SIZE,
gs_read_complete, &port->read_allocated);
if (status)
return status;
status = gs_alloc_requests(port->port_usb->in, &port->write_pool,
TX_QUEUE_SIZE, TX_BUF_SIZE, gs_write_complete, &port->write_allocated);
if (status) {
gs_free_requests(ep, head, &port->read_allocated);
return status;
}
/* queue read requests */
port->n_read = 0;
started = gs_start_rx(port);
if (!port->port_usb)
return -EIO;
/* unblock any pending writes into our circular buffer */
#ifndef CONFIG_USB_G_SERIAL_CONSOLE
if (started) {
tty_wakeup(port->port_tty);
} else {
gs_free_requests(ep, head, &port->read_allocated);
gs_free_requests(port->port_usb->in, &port->write_pool,
&port->write_allocated);
status = -EIO;
}
#else
if (!port->port_tty) return status;
if(started){
tty_wakeup(port->port_tty);
} else {
gs_free_requests(ep, head, &port->read_allocated);
gs_free_requests(port->port_usb->in, &port->write_pool,
&port->write_allocated);
status = -EIO;
}
#endif
return status;
}