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authorOliver Neukum <oliver@neukum.org>2008-01-22 12:47:15 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2008-02-01 14:35:05 -0800
commit3edbc986509888fa9977cc180c1fe458d2f89076 (patch)
treed80fa46312676df21cf89af632f15e1ac94c9f82 /drivers/usb/serial/kl5kusb105.c
parentb0a239da17beb34354181bebb744c0b0d534967f (diff)
USB: kl5kusb105 don't flush to logically disconnected devices
If disconnect() is called for a logical disconnect, no more IO must be done after disconnect() returns, or the old and new drivers may conflict. This patch avoids this by using the flag and lock introduced by the earlier patch for the mos7720 driver. Signed-off-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial/kl5kusb105.c')
-rw-r--r--drivers/usb/serial/kl5kusb105.c26
1 files changed, 15 insertions, 11 deletions
diff --git a/drivers/usb/serial/kl5kusb105.c b/drivers/usb/serial/kl5kusb105.c
index 90e3216abd1f..55736df7d2f4 100644
--- a/drivers/usb/serial/kl5kusb105.c
+++ b/drivers/usb/serial/kl5kusb105.c
@@ -461,17 +461,21 @@ static void klsi_105_close (struct usb_serial_port *port, struct file *filp)
dbg("%s port %d", __FUNCTION__, port->number);
- /* send READ_OFF */
- rc = usb_control_msg (port->serial->dev,
- usb_sndctrlpipe(port->serial->dev, 0),
- KL5KUSB105A_SIO_CONFIGURE,
- USB_TYPE_VENDOR | USB_DIR_OUT,
- KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
- 0, /* index */
- NULL, 0,
- KLSI_TIMEOUT);
- if (rc < 0)
- err("Disabling read failed (error = %d)", rc);
+ mutex_lock(&port->serial->disc_mutex);
+ if (!port->serial->disconnected) {
+ /* send READ_OFF */
+ rc = usb_control_msg (port->serial->dev,
+ usb_sndctrlpipe(port->serial->dev, 0),
+ KL5KUSB105A_SIO_CONFIGURE,
+ USB_TYPE_VENDOR | USB_DIR_OUT,
+ KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
+ 0, /* index */
+ NULL, 0,
+ KLSI_TIMEOUT);
+ if (rc < 0)
+ err("Disabling read failed (error = %d)", rc);
+ }
+ mutex_unlock(&port->serial->disc_mutex);
/* shutdown our bulk reads and writes */
usb_kill_urb(port->write_urb);