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[3/3] SUNRPC: Fix a hang in xprt_switch_set_next_cursor()

Message ID 20190716200433.38758-3-trond.myklebust@hammerspace.com (mailing list archive)
State New, archived
Headers show
Series [1/3] SUNRPC: Replace division by multiplication in calculation of queue length | expand

Commit Message

Trond Myklebust July 16, 2019, 8:04 p.m. UTC 
Apparently we do need the memory barrier.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 net/sunrpc/xprtmultipath.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)
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Patch

diff --git a/net/sunrpc/xprtmultipath.c b/net/sunrpc/xprtmultipath.c
index c12778e1235e..852da66cdaec 100644
--- a/net/sunrpc/xprtmultipath.c
+++ b/net/sunrpc/xprtmultipath.c
@@ -293,18 +293,14 @@  struct rpc_xprt *xprt_switch_set_next_cursor(struct list_head *head,
 		struct rpc_xprt **cursor,
 		xprt_switch_find_xprt_t find_next)
 {
-	struct rpc_xprt *cur, *pos, *old;
+	struct rpc_xprt *pos, *old;
 
-	cur = READ_ONCE(*cursor);
-	for (;;) {
-		old = cur;
+	old = READ_ONCE(*cursor);
+	do {
 		pos = find_next(head, old);
 		if (pos == NULL)
 			break;
-		cur = cmpxchg_relaxed(cursor, old, pos);
-		if (cur == old)
-			break;
-	}
+	} while (!try_cmpxchg(cursor, &old, pos));
 	return pos;
 }