USB: serial: introduce a flag into the usb serial layer to tell drivers that their URBs are killed due to suspension

This patch introduces a flag into the usb serial layer to tell drivers
that their URBs are killed due to suspension. That is necessary to let
drivers know whether they should report an error back.

Signed-off-by: Oliver Neukum <oneukum@suse.de>

Hi Greg,

this is for 2.6.30. Patches to use this in drivers are under development.

	Regards
		Oliver

2 files changed, 6 insertions, 1 deletions

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index cfcfd5ab06ce..c6aaa6dc7564 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -1067,6 +1067,8 @@ int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
         struct usb_serial_port *port;
         int i, r = 0;
 
+        serial->suspending = 1;
+
         for (i = 0; i < serial->num_ports; ++i) {
                 port = serial->port[i];
                 if (port)
@@ -1084,8 +1086,10 @@ int usb_serial_resume(struct usb_interface *intf)
 {
         struct usb_serial *serial = usb_get_intfdata(intf);
 
+        serial->suspending = 0;
         if (serial->type->resume)
                 return serial->type->resume(serial);
+
         return 0;
 }
 EXPORT_SYMBOL(usb_serial_resume);
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index 0b8617a9176d..b95842542590 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -130,7 +130,8 @@ struct usb_serial {
         struct usb_device               *dev;
         struct usb_serial_driver        *type;
         struct usb_interface            *interface;
-        unsigned char                   disconnected;
+        unsigned char                   disconnected:1;
+        unsigned char                   suspending:1;
         unsigned char                   minor;
         unsigned char                   num_ports;
         unsigned char                   num_port_pointers;