[AFS]: Eliminate cmpxchg() usage in vlocation code.
cmpxchg() is not available on every processor so can't
be used in generic code.
Replace with spinlock protection on the ->state changes,
wakeups, and wait loops.
Add what appears to be a missing wakeup on transition
to AFS_VL_VALID state in afs_vlocation_updater().
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 73bfa0b..6dd3197 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -219,7 +219,7 @@
struct afs_volume *vols[3]; /* volume access record pointer (index by type) */
wait_queue_head_t waitq; /* status change waitqueue */
time_t update_at; /* time at which record should be updated */
- rwlock_t lock; /* access lock */
+ spinlock_t lock; /* access lock */
afs_vlocation_state_t state; /* volume location state */
unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */
unsigned short upd_busy_cnt; /* EBUSY count during update */