[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>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 73bfa0b2d99e..6dd3197d1d8d 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -219,7 +219,7 @@ struct afs_vlocation {
         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 */