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authorJohan Hovold <jhovold@gmail.com>2014-05-26 19:23:16 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-27 15:04:06 -0700
commit79eed03e77d481b55d85d1cfe5a1636a0d3897fd (patch)
tree412cc2dd0d0f05f6dbdabfff9aa333d8926c7ebf /drivers/usb/serial
parent170fad9e22df0063eba0701adb966786d7a4ec5a (diff)
downloadlinux-stericsson-79eed03e77d481b55d85d1cfe5a1636a0d3897fd.tar.gz
USB: usb_wwan: fix urb leak at shutdown
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: 383cedc3bb43 ("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>
Diffstat (limited to 'drivers/usb/serial')
-rw-r--r--drivers/usb/serial/usb_wwan.c34
1 files changed, 22 insertions, 12 deletions
diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 2b8f02696c00..2ab478b55759 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -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;