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path: root/drivers/usb/serial/keyspan_pda.c
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Diffstat (limited to 'drivers/usb/serial/keyspan_pda.c')
-rw-r--r--drivers/usb/serial/keyspan_pda.c66
1 files changed, 5 insertions, 61 deletions
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c
index d5c0c6ab4966..a40615674a68 100644
--- a/drivers/usb/serial/keyspan_pda.c
+++ b/drivers/usb/serial/keyspan_pda.c
@@ -12,59 +12,6 @@
*
* See Documentation/usb/usb-serial.txt for more information on using this
* driver
- *
- * (09/07/2001) gkh
- * cleaned up the Xircom support. Added ids for Entregra device which is
- * the same as the Xircom device. Enabled the code to be compiled for
- * either Xircom or Keyspan devices.
- *
- * (08/11/2001) Cristian M. Craciunescu
- * support for Xircom PGSDB9
- *
- * (05/31/2001) gkh
- * switched from using spinlock to a semaphore, which fixes lots of
- * problems.
- *
- * (04/08/2001) gb
- * Identify version on module load.
- *
- * (11/01/2000) Adam J. Richter
- * usb_device_id table support
- *
- * (10/05/2000) gkh
- * Fixed bug with urb->dev not being set properly, now that the usb
- * core needs it.
- *
- * (08/28/2000) gkh
- * Added locks for SMP safeness.
- * Fixed MOD_INC and MOD_DEC logic and the ability to open a port more
- * than once.
- *
- * (07/20/2000) borchers
- * - keyspan_pda_write no longer sleeps if it is called on interrupt time;
- * PPP and the line discipline with stty echo on can call write on
- * interrupt time and this would cause an oops if write slept
- * - if keyspan_pda_write is in an interrupt, it will not call
- * usb_control_msg (which sleeps) to query the room in the device
- * buffer, it simply uses the current room value it has
- * - if the urb is busy or if it is throttled keyspan_pda_write just
- * returns 0, rather than sleeping to wait for this to change; the
- * write_chan code in n_tty.c will sleep if needed before calling
- * keyspan_pda_write again
- * - if the device needs to be unthrottled, write now queues up the
- * call to usb_control_msg (which sleeps) to unthrottle the device
- * - the wakeups from keyspan_pda_write_bulk_callback are queued rather
- * than done directly from the callback to avoid the race in write_chan
- * - keyspan_pda_chars_in_buffer also indicates its buffer is full if the
- * urb status is -EINPROGRESS, meaning it cannot write at the moment
- *
- * (07/19/2000) gkh
- * Added module_init and module_exit functions to handle the fact that this
- * driver is a loadable module now.
- *
- * (03/26/2000) gkh
- * Split driver up into device specific pieces.
- *
*/
@@ -290,7 +237,6 @@ static void keyspan_pda_rx_unthrottle(struct tty_struct *tty)
struct usb_serial_port *port = tty->driver_data;
/* just restart the receive interrupt URB */
dbg("keyspan_pda_rx_unthrottle port %d", port->number);
- port->interrupt_in_urb->dev = port->serial->dev;
if (usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL))
dbg(" usb_submit_urb(read urb) failed");
}
@@ -532,11 +478,11 @@ static int keyspan_pda_write(struct tty_struct *tty,
the device is full (wait until it says there is room)
*/
spin_lock_bh(&port->lock);
- if (port->write_urb_busy || priv->tx_throttled) {
+ if (!test_bit(0, &port->write_urbs_free) || priv->tx_throttled) {
spin_unlock_bh(&port->lock);
return 0;
}
- port->write_urb_busy = 1;
+ clear_bit(0, &port->write_urbs_free);
spin_unlock_bh(&port->lock);
/* At this point the URB is in our control, nobody else can submit it
@@ -598,7 +544,6 @@ static int keyspan_pda_write(struct tty_struct *tty,
priv->tx_room -= count;
- port->write_urb->dev = port->serial->dev;
rc = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (rc) {
dbg(" usb_submit_urb(write bulk) failed");
@@ -618,7 +563,7 @@ static int keyspan_pda_write(struct tty_struct *tty,
rc = count;
exit:
if (rc < 0)
- port->write_urb_busy = 0;
+ set_bit(0, &port->write_urbs_free);
return rc;
}
@@ -628,7 +573,7 @@ static void keyspan_pda_write_bulk_callback(struct urb *urb)
struct usb_serial_port *port = urb->context;
struct keyspan_pda_private *priv;
- port->write_urb_busy = 0;
+ set_bit(0, &port->write_urbs_free);
priv = usb_get_serial_port_data(port);
/* queue up a wakeup at scheduler time */
@@ -661,7 +606,7 @@ static int keyspan_pda_chars_in_buffer(struct tty_struct *tty)
n_tty.c:normal_poll() ) that we're not writeable. */
spin_lock_irqsave(&port->lock, flags);
- if (port->write_urb_busy || priv->tx_throttled)
+ if (!test_bit(0, &port->write_urbs_free) || priv->tx_throttled)
ret = 256;
spin_unlock_irqrestore(&port->lock, flags);
return ret;
@@ -717,7 +662,6 @@ static int keyspan_pda_open(struct tty_struct *tty,
priv->tx_throttled = *room ? 0 : 1;
/*Start reading from the device*/
- port->interrupt_in_urb->dev = serial->dev;
rc = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (rc) {
dbg("%s - usb_submit_urb(read int) failed", __func__);