Merge branch 'master' into for-linus
diff --git a/arch/tile/lib/spinlock_32.c b/arch/tile/lib/spinlock_32.c
index 485e24d..5cd1c40 100644
--- a/arch/tile/lib/spinlock_32.c
+++ b/arch/tile/lib/spinlock_32.c
@@ -167,23 +167,30 @@
* when we compare them.
*/
u32 my_ticket_;
-
- /* Take out the next ticket; this will also stop would-be readers. */
- if (val & 1)
- val = get_rwlock(rwlock);
- rwlock->lock = __insn_addb(val, 1 << WR_NEXT_SHIFT);
-
- /* Extract my ticket value from the original word. */
- my_ticket_ = val >> WR_NEXT_SHIFT;
+ u32 iterations = 0;
/*
- * Wait until the "current" field matches our ticket, and
- * there are no remaining readers.
+ * Wait until there are no readers, then bump up the next
+ * field and capture the ticket value.
*/
for (;;) {
+ if (!(val & 1)) {
+ if ((val >> RD_COUNT_SHIFT) == 0)
+ break;
+ rwlock->lock = val;
+ }
+ delay_backoff(iterations++);
+ val = __insn_tns((int *)&rwlock->lock);
+ }
+
+ /* Take out the next ticket and extract my ticket value. */
+ rwlock->lock = __insn_addb(val, 1 << WR_NEXT_SHIFT);
+ my_ticket_ = val >> WR_NEXT_SHIFT;
+
+ /* Wait until the "current" field matches our ticket. */
+ for (;;) {
u32 curr_ = val >> WR_CURR_SHIFT;
- u32 readers = val >> RD_COUNT_SHIFT;
- u32 delta = ((my_ticket_ - curr_) & WR_MASK) + !!readers;
+ u32 delta = ((my_ticket_ - curr_) & WR_MASK);
if (likely(delta == 0))
break;