From: Johan Hovold <jhovold@xxxxxxxxx>
Use generic read implementation and use process_read_urb to do device
specific processing (handle line status).
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/serial/pl2303.c | 84 +++++++++++++------------------------------
1 files changed, 25 insertions(+), 59 deletions(-)
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 7aff622..77e9680 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -770,10 +770,8 @@ static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
pl2303_set_termios(tty, port, &tmp_termios);
dbg("%s - submitting read urb", __func__);
- result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+ result = usb_serial_generic_submit_read_urb(port, GFP_KERNEL);
if (result) {
- dev_err(&port->dev, "%s - failed submitting read urb,"
- " error %d\n", __func__, result);
pl2303_close(port);
return -EPROTO;
}
@@ -1037,13 +1035,31 @@ exit:
__func__, retval);
}
-static void pl2303_push_data(struct tty_struct *tty,
- struct usb_serial_port *port, struct urb *urb,
- u8 line_status)
+static void pl2303_process_read_urb(struct urb *urb)
{
+ struct usb_serial_port *port = urb->context;
+ struct pl2303_private *priv = usb_get_serial_port_data(port);
+ struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
- /* get tty_flag from status */
char tty_flag = TTY_NORMAL;
+ unsigned long flags;
+ u8 line_status;
+ int i;
+
+ /* update line status */
+ spin_lock_irqsave(&priv->lock, flags);
+ line_status = priv->line_status;
+ priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
+ spin_unlock_irqrestore(&priv->lock, flags);
+ wake_up_interruptible(&priv->delta_msr_wait);
+
+ if (!urb->actual_length)
+ return;
+
+ tty = tty_port_tty_get(&port->port);
+ if (!tty)
+ return;
+
/* break takes precedence over parity, */
/* which takes precedence over framing errors */
if (line_status & UART_BREAK_ERROR)
@@ -1061,63 +1077,13 @@ static void pl2303_push_data(struct tty_struct *tty,
if (tty_flag == TTY_NORMAL && !(port->port.console && port->sysrq))
tty_insert_flip_string(tty, data, urb->actual_length);
else {
- int i;
for (i = 0; i < urb->actual_length; ++i)
if (!usb_serial_handle_sysrq_char(tty, port, data[i]))
tty_insert_flip_char(tty, data[i], tty_flag);
}
- tty_flip_buffer_push(tty);
-}
-
-static void pl2303_read_bulk_callback(struct urb *urb)
-{
- struct usb_serial_port *port = urb->context;
- struct pl2303_private *priv = usb_get_serial_port_data(port);
- struct tty_struct *tty;
- unsigned long flags;
- int result;
- int status = urb->status;
- u8 line_status;
-
- dbg("%s - port %d", __func__, port->number);
-
- if (status) {
- dbg("%s - urb status = %d", __func__, status);
- if (status == -EPROTO) {
- /* PL2303 mysteriously fails with -EPROTO reschedule
- * the read */
- dbg("%s - caught -EPROTO, resubmitting the urb",
- __func__);
- result = usb_submit_urb(urb, GFP_ATOMIC);
- if (result)
- dev_err(&urb->dev->dev, "%s - failed"
- " resubmitting read urb, error %d\n",
- __func__, result);
- return;
- }
- dbg("%s - unable to handle the error, exiting.", __func__);
- return;
- }
- usb_serial_debug_data(debug, &port->dev, __func__,
- urb->actual_length, urb->transfer_buffer);
-
- spin_lock_irqsave(&priv->lock, flags);
- line_status = priv->line_status;
- priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
- spin_unlock_irqrestore(&priv->lock, flags);
- wake_up_interruptible(&priv->delta_msr_wait);
-
- tty = tty_port_tty_get(&port->port);
- if (tty && urb->actual_length) {
- pl2303_push_data(tty, port, urb, line_status);
- }
+ tty_flip_buffer_push(tty);
tty_kref_put(tty);
- /* Schedule the next read _if_ we are still open */
- result = usb_submit_urb(urb, GFP_ATOMIC);
- if (result && result != -EPERM)
- dev_err(&urb->dev->dev, "%s - failed resubmitting"
- " read urb, error %d\n", __func__, result);
}
static void pl2303_write_bulk_callback(struct urb *urb)
@@ -1182,7 +1148,7 @@ static struct usb_serial_driver pl2303_device = {
.set_termios = pl2303_set_termios,
.tiocmget = pl2303_tiocmget,
.tiocmset = pl2303_tiocmset,
- .read_bulk_callback = pl2303_read_bulk_callback,
+ .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,
--
1.7.1
--
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