From da280e3488660042a1659cb756ae6ab0bf6f8f5f Mon Sep 17 00:00:00 2001
From: Johan Hovold <jhovold@gmail.com>
Date: Sun, 6 Nov 2011 19:06:24 +0100
Subject: [PATCH] USB: keyspan_pda: clean up write-urb busy handling
Use port write_urbs_free mask rather than write_urb_busy field in struct
serial_port.
Compile-only tested.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/usb/serial/keyspan_pda.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c
index fde553785d2bb..9428cc0cfb12b 100644
--- a/drivers/usb/serial/keyspan_pda.c
+++ b/drivers/usb/serial/keyspan_pda.c
@@ -479,11 +479,11 @@ 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
@@ -565,7 +565,7 @@ 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;
}
@@ -575,7 +575,7 @@ 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 */
@@ -608,7 +608,7 @@ 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;
--
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