From c1cac10c175f4b01b6722d246d80dd6c9975f0c1 Mon Sep 17 00:00:00 2001
From: Johan Hovold <jhovold@gmail.com>
Date: Sun, 6 Nov 2011 19:06:23 +0100
Subject: [PATCH] USB: cyberjack: 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.
Cc: Matthias Bruestle and Harald Welte <support@reiner-sct.com>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/usb/serial/cyberjack.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
diff --git a/drivers/usb/serial/cyberjack.c b/drivers/usb/serial/cyberjack.c
index f744ab7a3b19f..5a41252807cbd 100644
--- a/drivers/usb/serial/cyberjack.c
+++ b/drivers/usb/serial/cyberjack.c
@@ -221,22 +221,18 @@ static int cyberjack_write(struct tty_struct *tty,
return 0;
}
- spin_lock_bh(&port->lock);
- if (port->write_urb_busy) {
- spin_unlock_bh(&port->lock);
+ if (!test_and_clear_bit(0, &port->write_urbs_free)) {
dbg("%s - already writing", __func__);
return 0;
}
- port->write_urb_busy = 1;
- spin_unlock_bh(&port->lock);
spin_lock_irqsave(&priv->lock, flags);
if (count+priv->wrfilled > sizeof(priv->wrbuf)) {
/* To much data for buffer. Reset buffer. */
priv->wrfilled = 0;
- port->write_urb_busy = 0;
spin_unlock_irqrestore(&priv->lock, flags);
+ set_bit(0, &port->write_urbs_free);
return 0;
}
@@ -283,7 +279,7 @@ static int cyberjack_write(struct tty_struct *tty,
priv->wrfilled = 0;
priv->wrsent = 0;
spin_unlock_irqrestore(&priv->lock, flags);
- port->write_urb_busy = 0;
+ set_bit(0, &port->write_urbs_free);
return 0;
}
@@ -432,7 +428,7 @@ static void cyberjack_write_bulk_callback(struct urb *urb)
dbg("%s - port %d", __func__, port->number);
- port->write_urb_busy = 0;
+ set_bit(0, &port->write_urbs_free);
if (status) {
dbg("%s - nonzero write bulk status received: %d",
__func__, status);
--
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