HID: fix possible deadlock in usbhid_close()

This patch switches usbhid_close() from flush_scheduled_work() to canceling
the outstanding work. This fixes a possible deadlock due to work taking
the mutex usbhid_close() holds. Lockdep reported the problem.

Signed-off-by: Oliver Neukum <oliver@neukum.org>
--
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 4306cb1..900ce18 100644 (file)
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -662,8 +662,8 @@ void usbhid_close(struct hid_device *hid)
        spin_lock_irq(&usbhid->lock);
        if (!--hid->open) {
                spin_unlock_irq(&usbhid->lock);
+               hid_cancel_delayed_stuff(usbhid);
                usb_kill_urb(usbhid->urbin);
-               flush_scheduled_work();
                usbhid->intf->needs_remote_wakeup = 0;
        } else {
                spin_unlock_irq(&usbhid->lock);