usbnet: allow status interrupt URB to always be active
Some drivers (sierra_net) need the status interrupt URB
active even when the device is closed, because they receive
custom indications from firmware. Add functions to refcount
the status interrupt URB submit/kill operation so that
sub-drivers and the generic driver don't fight over whether
the status interrupt URB is active or not.
A sub-driver can call usbnet_status_start() at any time, but
the URB is only submitted the first time the function is
called. Likewise, when the sub-driver is done with the URB,
it calls usbnet_status_stop() but the URB is only killed when
all users have stopped it. The URB is still killed and
re-submitted for suspend/resume, as before, with the same
refcount it had at suspend.
Signed-off-by: Dan Williams <dcbw@redhat.com>
Acked-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index da46327..f18d641 100644
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -56,6 +56,8 @@
struct sk_buff_head done;
struct sk_buff_head rxq_pause;
struct urb *interrupt;
+ unsigned interrupt_count;
+ struct mutex interrupt_mutex;
struct usb_anchor deferred;
struct tasklet_struct bh;
@@ -248,4 +250,7 @@
extern int usbnet_manage_power(struct usbnet *, int);
extern void usbnet_link_change(struct usbnet *, bool, bool);
+extern int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags);
+extern void usbnet_status_stop(struct usbnet *dev);
+
#endif /* __LINUX_USB_USBNET_H */