When canceling the transfer, the callback is still called, just with the

canceled status, so we need to collect the corresponding sem release. Otherwise
we would run directly into the old cancel status the next time we schedule.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34932 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/drivers/input/wacom/wacom.c

@@ -548,6 +548,9 @@ device_read(void* cookie, off_t pos, void* buf, size_t* count)
 				// handle time out
 				if (ret < B_OK) {
 					usb->cancel_queued_transfers(device->pipe);
+					acquire_sem(device->notify_lock);
+						// collect the sem released by the cancel
+
 					if (ret == B_TIMED_OUT) {
 						// a time_out is ok, since it only means that the device
 						// had nothing to report (ie mouse/pen was not moved)