* we need to ensure there's a memory barrier after it. The bit
* *must* be set before we do the atomic_inc() on pvcc->inflight.
* There's no smp_mb__after_set_bit(), so it's this or abuse
- * smp_mb__after_clear_bit().
+ * smp_mb__after_atomic().
*/
test_and_set_bit(BLOCKED, &pvcc->blocked);