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USB: usb_wwan: fix urb leak at shutdown

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The delayed-write queue was never emptied at shutdown (close), something
which could lead to leaked urbs if the port is closed before being
runtime resumed due to a write.

When this happens the output buffer would not drain on close
(closing_wait timeout), and after consecutive opens, writes could be
corrupted with previously buffered data, transfered with reduced
throughput or completely blocked.

Note that unbusy_queued_urb() was simply moved out of CONFIG_PM.

Fixes: 383cedc3bb ("USB: serial: full autosuspend support for the
option driver")

Cc: <stable@vger.kernel.org>	# v2.6.32
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2014-05-26 19:23:16 +02:00 committed by Greg Kroah-Hartman
parent 170fad9e22
commit 79eed03e77
1 changed files with 22 additions and 12 deletions
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34
drivers/usb/serial/usb_wwan.c
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@ -414,12 +414,26 @@ int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
}
EXPORT_SYMBOL(usb_wwan_open);
static void unbusy_queued_urb(struct urb *urb,
struct usb_wwan_port_private *portdata)
{
int i;
for (i = 0; i < N_OUT_URB; i++) {
if (urb == portdata->out_urbs[i]) {
clear_bit(i, &portdata->out_busy);
break;
}
}
}
void usb_wwan_close(struct usb_serial_port *port)
{
int i;
struct usb_serial *serial = port->serial;
struct usb_wwan_port_private *portdata;
struct usb_wwan_intf_private *intfdata = port->serial->private;
struct urb *urb;
portdata = usb_get_serial_port_data(port);
@ -428,6 +442,14 @@ void usb_wwan_close(struct usb_serial_port *port)
portdata->opened = 0;
spin_unlock_irq(&intfdata->susp_lock);
for (;;) {
urb = usb_get_from_anchor(&portdata->delayed);
if (!urb)
break;
unbusy_queued_urb(urb, portdata);
usb_autopm_put_interface_async(serial->interface);
}
for (i = 0; i < N_IN_URB; i++)
usb_kill_urb(portdata->in_urbs[i]);
for (i = 0; i < N_OUT_URB; i++)
@ -596,18 +618,6 @@ int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
}
EXPORT_SYMBOL(usb_wwan_suspend);
static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
{
int i;
for (i = 0; i < N_OUT_URB; i++) {
if (urb == portdata->out_urbs[i]) {
clear_bit(i, &portdata->out_busy);
break;
}
}
}
static void play_delayed(struct usb_serial_port *port)
{
struct usb_wwan_intf_private *data;