USB: io_ti: use kfifo to implement write buffering
Kill custom fifo implementation. Compile-only tested. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Johan Hovold
Greg Kroah-Hartman
Родитель
a3a30f10f5
Коммит
d733cec1ab
|
|
@ -36,6 +36,7 @@
|
|||
#include <linux/spinlock.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/serial.h>
|
||||
#include <linux/kfifo.h>
|
||||
#include <linux/ioctl.h>
|
||||
#include <linux/firmware.h>
|
||||
#include <linux/uaccess.h>
|
||||
|
|
@ -83,14 +84,6 @@ struct product_info {
|
|||
__u8 hardware_type; /* Type of hardware */
|
||||
} __attribute__((packed));
|
||||
|
||||
/* circular buffer */
|
||||
struct edge_buf {
|
||||
unsigned int buf_size;
|
||||
char *buf_buf;
|
||||
char *buf_get;
|
||||
char *buf_put;
|
||||
};
|
||||
|
||||
struct edgeport_port {
|
||||
__u16 uart_base;
|
||||
__u16 dma_address;
|
||||
|
|
@ -114,7 +107,7 @@ struct edgeport_port {
|
|||
spinlock_t ep_lock;
|
||||
int ep_read_urb_state;
|
||||
int ep_write_urb_in_use;
|
||||
struct edge_buf *ep_out_buf;
|
||||
struct kfifo write_fifo;
|
||||
};
|
||||
|
||||
struct edgeport_serial {
|
||||
|
|
@ -244,17 +237,6 @@ static void edge_send(struct tty_struct *tty);
|
|||
static int edge_create_sysfs_attrs(struct usb_serial_port *port);
|
||||
static int edge_remove_sysfs_attrs(struct usb_serial_port *port);
|
||||
|
||||
/* circular buffer */
|
||||
static struct edge_buf *edge_buf_alloc(unsigned int size);
|
||||
static void edge_buf_free(struct edge_buf *eb);
|
||||
static void edge_buf_clear(struct edge_buf *eb);
|
||||
static unsigned int edge_buf_data_avail(struct edge_buf *eb);
|
||||
static unsigned int edge_buf_space_avail(struct edge_buf *eb);
|
||||
static unsigned int edge_buf_put(struct edge_buf *eb, const char *buf,
|
||||
unsigned int count);
|
||||
static unsigned int edge_buf_get(struct edge_buf *eb, char *buf,
|
||||
unsigned int count);
|
||||
|
||||
|
||||
static int ti_vread_sync(struct usb_device *dev, __u8 request,
|
||||
__u16 value, __u16 index, u8 *data, int size)
|
||||
|
|
@ -585,7 +567,7 @@ static void chase_port(struct edgeport_port *port, unsigned long timeout,
|
|||
add_wait_queue(&tty->write_wait, &wait);
|
||||
for (;;) {
|
||||
set_current_state(TASK_INTERRUPTIBLE);
|
||||
if (edge_buf_data_avail(port->ep_out_buf) == 0
|
||||
if (kfifo_len(&port->write_fifo) == 0
|
||||
|| timeout == 0 || signal_pending(current)
|
||||
|| !usb_get_intfdata(port->port->serial->interface))
|
||||
/* disconnect */
|
||||
|
|
@ -597,7 +579,7 @@ static void chase_port(struct edgeport_port *port, unsigned long timeout,
|
|||
set_current_state(TASK_RUNNING);
|
||||
remove_wait_queue(&tty->write_wait, &wait);
|
||||
if (flush)
|
||||
edge_buf_clear(port->ep_out_buf);
|
||||
kfifo_reset_out(&port->write_fifo);
|
||||
spin_unlock_irqrestore(&port->ep_lock, flags);
|
||||
tty_kref_put(tty);
|
||||
|
||||
|
|
@ -2084,7 +2066,6 @@ static int edge_write(struct tty_struct *tty, struct usb_serial_port *port,
|
|||
const unsigned char *data, int count)
|
||||
{
|
||||
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
|
||||
unsigned long flags;
|
||||
|
||||
dbg("%s - port %d", __func__, port->number);
|
||||
|
||||
|
|
@ -2098,10 +2079,8 @@ static int edge_write(struct tty_struct *tty, struct usb_serial_port *port,
|
|||
if (edge_port->close_pending == 1)
|
||||
return -ENODEV;
|
||||
|
||||
spin_lock_irqsave(&edge_port->ep_lock, flags);
|
||||
count = edge_buf_put(edge_port->ep_out_buf, data, count);
|
||||
spin_unlock_irqrestore(&edge_port->ep_lock, flags);
|
||||
|
||||
count = kfifo_in_locked(&edge_port->write_fifo, data, count,
|
||||
&edge_port->ep_lock);
|
||||
edge_send(tty);
|
||||
|
||||
return count;
|
||||
|
|
@ -2124,7 +2103,7 @@ static void edge_send(struct tty_struct *tty)
|
|||
return;
|
||||
}
|
||||
|
||||
count = edge_buf_get(edge_port->ep_out_buf,
|
||||
count = kfifo_out(&edge_port->write_fifo,
|
||||
port->write_urb->transfer_buffer,
|
||||
port->bulk_out_size);
|
||||
|
||||
|
|
@ -2180,7 +2159,7 @@ static int edge_write_room(struct tty_struct *tty)
|
|||
return 0;
|
||||
|
||||
spin_lock_irqsave(&edge_port->ep_lock, flags);
|
||||
room = edge_buf_space_avail(edge_port->ep_out_buf);
|
||||
room = kfifo_avail(&edge_port->write_fifo);
|
||||
spin_unlock_irqrestore(&edge_port->ep_lock, flags);
|
||||
|
||||
dbg("%s - returns %d", __func__, room);
|
||||
|
|
@ -2202,7 +2181,7 @@ static int edge_chars_in_buffer(struct tty_struct *tty)
|
|||
return 0;
|
||||
|
||||
spin_lock_irqsave(&edge_port->ep_lock, flags);
|
||||
chars = edge_buf_data_avail(edge_port->ep_out_buf);
|
||||
chars = kfifo_len(&edge_port->write_fifo);
|
||||
spin_unlock_irqrestore(&edge_port->ep_lock, flags);
|
||||
|
||||
dbg("%s - returns %d", __func__, chars);
|
||||
|
|
@ -2659,8 +2638,8 @@ static int edge_startup(struct usb_serial *serial)
|
|||
goto cleanup;
|
||||
}
|
||||
spin_lock_init(&edge_port->ep_lock);
|
||||
edge_port->ep_out_buf = edge_buf_alloc(EDGE_OUT_BUF_SIZE);
|
||||
if (edge_port->ep_out_buf == NULL) {
|
||||
if (kfifo_alloc(&edge_port->write_fifo, EDGE_OUT_BUF_SIZE,
|
||||
GFP_KERNEL)) {
|
||||
dev_err(&serial->dev->dev, "%s - Out of memory\n",
|
||||
__func__);
|
||||
kfree(edge_port);
|
||||
|
|
@ -2677,7 +2656,7 @@ static int edge_startup(struct usb_serial *serial)
|
|||
cleanup:
|
||||
for (--i; i >= 0; --i) {
|
||||
edge_port = usb_get_serial_port_data(serial->port[i]);
|
||||
edge_buf_free(edge_port->ep_out_buf);
|
||||
kfifo_free(&edge_port->write_fifo);
|
||||
kfree(edge_port);
|
||||
usb_set_serial_port_data(serial->port[i], NULL);
|
||||
}
|
||||
|
|
@ -2708,7 +2687,7 @@ static void edge_release(struct usb_serial *serial)
|
|||
|
||||
for (i = 0; i < serial->num_ports; ++i) {
|
||||
edge_port = usb_get_serial_port_data(serial->port[i]);
|
||||
edge_buf_free(edge_port->ep_out_buf);
|
||||
kfifo_free(&edge_port->write_fifo);
|
||||
kfree(edge_port);
|
||||
}
|
||||
kfree(usb_get_serial_data(serial));
|
||||
|
|
@ -2758,182 +2737,6 @@ static int edge_remove_sysfs_attrs(struct usb_serial_port *port)
|
|||
}
|
||||
|
||||
|
||||
/* Circular Buffer */
|
||||
|
||||
/*
|
||||
* edge_buf_alloc
|
||||
*
|
||||
* Allocate a circular buffer and all associated memory.
|
||||
*/
|
||||
|
||||
static struct edge_buf *edge_buf_alloc(unsigned int size)
|
||||
{
|
||||
struct edge_buf *eb;
|
||||
|
||||
|
||||
if (size == 0)
|
||||
return NULL;
|
||||
|
||||
eb = kmalloc(sizeof(struct edge_buf), GFP_KERNEL);
|
||||
if (eb == NULL)
|
||||
return NULL;
|
||||
|
||||
eb->buf_buf = kmalloc(size, GFP_KERNEL);
|
||||
if (eb->buf_buf == NULL) {
|
||||
kfree(eb);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
eb->buf_size = size;
|
||||
eb->buf_get = eb->buf_put = eb->buf_buf;
|
||||
|
||||
return eb;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* edge_buf_free
|
||||
*
|
||||
* Free the buffer and all associated memory.
|
||||
*/
|
||||
|
||||
static void edge_buf_free(struct edge_buf *eb)
|
||||
{
|
||||
if (eb) {
|
||||
kfree(eb->buf_buf);
|
||||
kfree(eb);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* edge_buf_clear
|
||||
*
|
||||
* Clear out all data in the circular buffer.
|
||||
*/
|
||||
|
||||
static void edge_buf_clear(struct edge_buf *eb)
|
||||
{
|
||||
if (eb != NULL)
|
||||
eb->buf_get = eb->buf_put;
|
||||
/* equivalent to a get of all data available */
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* edge_buf_data_avail
|
||||
*
|
||||
* Return the number of bytes of data available in the circular
|
||||
* buffer.
|
||||
*/
|
||||
|
||||
static unsigned int edge_buf_data_avail(struct edge_buf *eb)
|
||||
{
|
||||
if (eb == NULL)
|
||||
return 0;
|
||||
return ((eb->buf_size + eb->buf_put - eb->buf_get) % eb->buf_size);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* edge_buf_space_avail
|
||||
*
|
||||
* Return the number of bytes of space available in the circular
|
||||
* buffer.
|
||||
*/
|
||||
|
||||
static unsigned int edge_buf_space_avail(struct edge_buf *eb)
|
||||
{
|
||||
if (eb == NULL)
|
||||
return 0;
|
||||
return ((eb->buf_size + eb->buf_get - eb->buf_put - 1) % eb->buf_size);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* edge_buf_put
|
||||
*
|
||||
* Copy data data from a user buffer and put it into the circular buffer.
|
||||
* Restrict to the amount of space available.
|
||||
*
|
||||
* Return the number of bytes copied.
|
||||
*/
|
||||
|
||||
static unsigned int edge_buf_put(struct edge_buf *eb, const char *buf,
|
||||
unsigned int count)
|
||||
{
|
||||
unsigned int len;
|
||||
|
||||
|
||||
if (eb == NULL)
|
||||
return 0;
|
||||
|
||||
len = edge_buf_space_avail(eb);
|
||||
if (count > len)
|
||||
count = len;
|
||||
|
||||
if (count == 0)
|
||||
return 0;
|
||||
|
||||
len = eb->buf_buf + eb->buf_size - eb->buf_put;
|
||||
if (count > len) {
|
||||
memcpy(eb->buf_put, buf, len);
|
||||
memcpy(eb->buf_buf, buf+len, count - len);
|
||||
eb->buf_put = eb->buf_buf + count - len;
|
||||
} else {
|
||||
memcpy(eb->buf_put, buf, count);
|
||||
if (count < len)
|
||||
eb->buf_put += count;
|
||||
else /* count == len */
|
||||
eb->buf_put = eb->buf_buf;
|
||||
}
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* edge_buf_get
|
||||
*
|
||||
* Get data from the circular buffer and copy to the given buffer.
|
||||
* Restrict to the amount of data available.
|
||||
*
|
||||
* Return the number of bytes copied.
|
||||
*/
|
||||
|
||||
static unsigned int edge_buf_get(struct edge_buf *eb, char *buf,
|
||||
unsigned int count)
|
||||
{
|
||||
unsigned int len;
|
||||
|
||||
|
||||
if (eb == NULL)
|
||||
return 0;
|
||||
|
||||
len = edge_buf_data_avail(eb);
|
||||
if (count > len)
|
||||
count = len;
|
||||
|
||||
if (count == 0)
|
||||
return 0;
|
||||
|
||||
len = eb->buf_buf + eb->buf_size - eb->buf_get;
|
||||
if (count > len) {
|
||||
memcpy(buf, eb->buf_get, len);
|
||||
memcpy(buf+len, eb->buf_buf, count - len);
|
||||
eb->buf_get = eb->buf_buf + count - len;
|
||||
} else {
|
||||
memcpy(buf, eb->buf_get, count);
|
||||
if (count < len)
|
||||
eb->buf_get += count;
|
||||
else /* count == len */
|
||||
eb->buf_get = eb->buf_buf;
|
||||
}
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
|
||||
static struct usb_serial_driver edgeport_1port_device = {
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче