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USB: fix usb serial pm counter decrement for disconnected interfaces 

usb serial decrements the pm counter even if an interface has been
disconnected. If it was a logical disconnect the interface may belong
already to another driver. This patch introduces a check for disconnected
interfaces.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Cc: Stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2008-06-25 13:32:49 +02:00 committed by Greg Kroah-Hartman
parent 17d80d562f
commit 62ad296b6c
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/serial/usb-serial.c
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@ -283,7 +283,10 @@ static void serial_close(struct tty_struct *tty, struct file * filp)
}
if (port->open_count == 0) {
usb_autopm_put_interface(port->serial->interface);
mutex_lock(&port->serial->disc_mutex);
if (!port->serial->disconnected)
usb_autopm_put_interface(port->serial->interface);
mutex_unlock(&port->serial->disc_mutex);
module_put(port->serial->type->driver.owner);
}