USB: pl2303: switch to generic write implementation
Replace custom fifo-based write implementation with the generic
kfifo-based one.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 77e9680..28037c1 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -40,16 +40,6 @@
#define PL2303_CLOSING_WAIT (30*HZ)
-#define PL2303_BUF_SIZE 1024
-#define PL2303_TMP_BUF_SIZE 1024
-
-struct pl2303_buf {
- unsigned int buf_size;
- char *buf_buf;
- char *buf_get;
- char *buf_put;
-};
-
static const struct usb_device_id id_table[] = {
{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
@@ -157,173 +147,12 @@
struct pl2303_private {
spinlock_t lock;
- struct pl2303_buf *buf;
- int write_urb_in_use;
wait_queue_head_t delta_msr_wait;
u8 line_control;
u8 line_status;
enum pl2303_type type;
};
-/*
- * pl2303_buf_alloc
- *
- * Allocate a circular buffer and all associated memory.
- */
-static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
-{
- struct pl2303_buf *pb;
-
- if (size == 0)
- return NULL;
-
- pb = kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
- if (pb == NULL)
- return NULL;
-
- pb->buf_buf = kmalloc(size, GFP_KERNEL);
- if (pb->buf_buf == NULL) {
- kfree(pb);
- return NULL;
- }
-
- pb->buf_size = size;
- pb->buf_get = pb->buf_put = pb->buf_buf;
-
- return pb;
-}
-
-/*
- * pl2303_buf_free
- *
- * Free the buffer and all associated memory.
- */
-static void pl2303_buf_free(struct pl2303_buf *pb)
-{
- if (pb) {
- kfree(pb->buf_buf);
- kfree(pb);
- }
-}
-
-/*
- * pl2303_buf_clear
- *
- * Clear out all data in the circular buffer.
- */
-static void pl2303_buf_clear(struct pl2303_buf *pb)
-{
- if (pb != NULL)
- pb->buf_get = pb->buf_put;
- /* equivalent to a get of all data available */
-}
-
-/*
- * pl2303_buf_data_avail
- *
- * Return the number of bytes of data available in the circular
- * buffer.
- */
-static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
-{
- if (pb == NULL)
- return 0;
-
- return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size;
-}
-
-/*
- * pl2303_buf_space_avail
- *
- * Return the number of bytes of space available in the circular
- * buffer.
- */
-static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
-{
- if (pb == NULL)
- return 0;
-
- return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size;
-}
-
-/*
- * pl2303_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 pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
- unsigned int count)
-{
- unsigned int len;
-
- if (pb == NULL)
- return 0;
-
- len = pl2303_buf_space_avail(pb);
- if (count > len)
- count = len;
-
- if (count == 0)
- return 0;
-
- len = pb->buf_buf + pb->buf_size - pb->buf_put;
- if (count > len) {
- memcpy(pb->buf_put, buf, len);
- memcpy(pb->buf_buf, buf+len, count - len);
- pb->buf_put = pb->buf_buf + count - len;
- } else {
- memcpy(pb->buf_put, buf, count);
- if (count < len)
- pb->buf_put += count;
- else /* count == len */
- pb->buf_put = pb->buf_buf;
- }
-
- return count;
-}
-
-/*
- * pl2303_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 pl2303_buf_get(struct pl2303_buf *pb, char *buf,
- unsigned int count)
-{
- unsigned int len;
-
- if (pb == NULL)
- return 0;
-
- len = pl2303_buf_data_avail(pb);
- if (count > len)
- count = len;
-
- if (count == 0)
- return 0;
-
- len = pb->buf_buf + pb->buf_size - pb->buf_get;
- if (count > len) {
- memcpy(buf, pb->buf_get, len);
- memcpy(buf+len, pb->buf_buf, count - len);
- pb->buf_get = pb->buf_buf + count - len;
- } else {
- memcpy(buf, pb->buf_get, count);
- if (count < len)
- pb->buf_get += count;
- else /* count == len */
- pb->buf_get = pb->buf_buf;
- }
-
- return count;
-}
-
static int pl2303_vendor_read(__u16 value, __u16 index,
struct usb_serial *serial, unsigned char *buf)
{
@@ -372,11 +201,6 @@
if (!priv)
goto cleanup;
spin_lock_init(&priv->lock);
- priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
- if (priv->buf == NULL) {
- kfree(priv);
- goto cleanup;
- }
init_waitqueue_head(&priv->delta_msr_wait);
priv->type = type;
usb_set_serial_port_data(serial->port[i], priv);
@@ -404,7 +228,6 @@
kfree(buf);
for (--i; i >= 0; --i) {
priv = usb_get_serial_port_data(serial->port[i]);
- pl2303_buf_free(priv->buf);
kfree(priv);
usb_set_serial_port_data(serial->port[i], NULL);
}
@@ -422,102 +245,6 @@
return retval;
}
-static void pl2303_send(struct usb_serial_port *port)
-{
- int count, result;
- struct pl2303_private *priv = usb_get_serial_port_data(port);
- unsigned long flags;
-
- dbg("%s - port %d", __func__, port->number);
-
- spin_lock_irqsave(&priv->lock, flags);
-
- if (priv->write_urb_in_use) {
- spin_unlock_irqrestore(&priv->lock, flags);
- return;
- }
-
- count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
- port->bulk_out_size);
-
- if (count == 0) {
- spin_unlock_irqrestore(&priv->lock, flags);
- return;
- }
-
- priv->write_urb_in_use = 1;
-
- spin_unlock_irqrestore(&priv->lock, flags);
-
- usb_serial_debug_data(debug, &port->dev, __func__, count,
- port->write_urb->transfer_buffer);
-
- port->write_urb->transfer_buffer_length = count;
- result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
- if (result) {
- dev_err(&port->dev, "%s - failed submitting write urb,"
- " error %d\n", __func__, result);
- priv->write_urb_in_use = 0;
- /* TODO: reschedule pl2303_send */
- }
-
- usb_serial_port_softint(port);
-}
-
-static int pl2303_write(struct tty_struct *tty, struct usb_serial_port *port,
- const unsigned char *buf, int count)
-{
- struct pl2303_private *priv = usb_get_serial_port_data(port);
- unsigned long flags;
-
- dbg("%s - port %d, %d bytes", __func__, port->number, count);
-
- if (!count)
- return count;
-
- spin_lock_irqsave(&priv->lock, flags);
- count = pl2303_buf_put(priv->buf, buf, count);
- spin_unlock_irqrestore(&priv->lock, flags);
-
- pl2303_send(port);
-
- return count;
-}
-
-static int pl2303_write_room(struct tty_struct *tty)
-{
- struct usb_serial_port *port = tty->driver_data;
- struct pl2303_private *priv = usb_get_serial_port_data(port);
- int room = 0;
- unsigned long flags;
-
- dbg("%s - port %d", __func__, port->number);
-
- spin_lock_irqsave(&priv->lock, flags);
- room = pl2303_buf_space_avail(priv->buf);
- spin_unlock_irqrestore(&priv->lock, flags);
-
- dbg("%s - returns %d", __func__, room);
- return room;
-}
-
-static int pl2303_chars_in_buffer(struct tty_struct *tty)
-{
- struct usb_serial_port *port = tty->driver_data;
- struct pl2303_private *priv = usb_get_serial_port_data(port);
- int chars = 0;
- unsigned long flags;
-
- dbg("%s - port %d", __func__, port->number);
-
- spin_lock_irqsave(&priv->lock, flags);
- chars = pl2303_buf_data_avail(priv->buf);
- spin_unlock_irqrestore(&priv->lock, flags);
-
- dbg("%s - returns %d", __func__, chars);
- return chars;
-}
-
static void pl2303_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
@@ -729,15 +456,14 @@
static void pl2303_close(struct usb_serial_port *port)
{
- struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
dbg("%s - port %d", __func__, port->number);
- spin_lock_irqsave(&priv->lock, flags);
+ spin_lock_irqsave(&port->lock, flags);
/* clear out any remaining data in the buffer */
- pl2303_buf_clear(priv->buf);
- spin_unlock_irqrestore(&priv->lock, flags);
+ kfifo_reset_out(&port->write_fifo);
+ spin_unlock_irqrestore(&port->lock, flags);
/* shutdown our urbs */
dbg("%s - shutting down urbs", __func__);
@@ -951,10 +677,7 @@
for (i = 0; i < serial->num_ports; ++i) {
priv = usb_get_serial_port_data(serial->port[i]);
- if (priv) {
- pl2303_buf_free(priv->buf);
- kfree(priv);
- }
+ kfree(priv);
}
}
@@ -1086,47 +809,6 @@
tty_kref_put(tty);
}
-static void pl2303_write_bulk_callback(struct urb *urb)
-{
- struct usb_serial_port *port = urb->context;
- struct pl2303_private *priv = usb_get_serial_port_data(port);
- int result;
- int status = urb->status;
-
- dbg("%s - port %d", __func__, port->number);
-
- switch (status) {
- case 0:
- /* success */
- break;
- case -ECONNRESET:
- case -ENOENT:
- case -ESHUTDOWN:
- /* this urb is terminated, clean up */
- dbg("%s - urb shutting down with status: %d", __func__,
- status);
- priv->write_urb_in_use = 0;
- return;
- default:
- /* error in the urb, so we have to resubmit it */
- dbg("%s - Overflow in write", __func__);
- dbg("%s - nonzero write bulk status received: %d", __func__,
- status);
- port->write_urb->transfer_buffer_length = 1;
- result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
- if (result)
- dev_err(&urb->dev->dev, "%s - failed resubmitting write"
- " urb, error %d\n", __func__, result);
- else
- return;
- }
-
- priv->write_urb_in_use = 0;
-
- /* send any buffered data */
- pl2303_send(port);
-}
-
/* All of the device info needed for the PL2303 SIO serial converter */
static struct usb_serial_driver pl2303_device = {
.driver = {
@@ -1142,7 +824,6 @@
.close = pl2303_close,
.dtr_rts = pl2303_dtr_rts,
.carrier_raised = pl2303_carrier_raised,
- .write = pl2303_write,
.ioctl = pl2303_ioctl,
.break_ctl = pl2303_break_ctl,
.set_termios = pl2303_set_termios,
@@ -1150,9 +831,6 @@
.tiocmset = pl2303_tiocmset,
.process_read_urb = pl2303_process_read_urb,
.read_int_callback = pl2303_read_int_callback,
- .write_bulk_callback = pl2303_write_bulk_callback,
- .write_room = pl2303_write_room,
- .chars_in_buffer = pl2303_chars_in_buffer,
.attach = pl2303_startup,
.release = pl2303_release,
};