linux-kernel - [PATCH 5.14 103/432] xprtrdma: Put rpcrdma_reps before waking the tear-down completion

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Message-Id: <20210916155814.268217925@linuxfoundation.org>
Date:   Thu, 16 Sep 2021 17:57:32 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chuck Lever <chuck.lever@...cle.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 103/432] xprtrdma: Put rpcrdma_reps before waking the tear-down completion

From: Chuck Lever <chuck.lever@...cle.com>

[ Upstream commit 97480cae13ca3a9c1de3eb6fd66cf9650a60db42 ]

Ensure the tear-down completion is awoken only /after/ we've stopped
fiddling with rpcrdma_rep objects in rpcrdma_post_recvs().

Fixes: 15788d1d1077 ("xprtrdma: Do not refresh Receive Queue while it is draining")
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/sunrpc/xprtrdma/verbs.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 649c23518ec0..5a11e318a0d9 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1416,11 +1416,6 @@ void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, int needed, bool temp)
 
 	rc = ib_post_recv(ep->re_id->qp, wr,
 			  (const struct ib_recv_wr **)&bad_wr);
-	if (atomic_dec_return(&ep->re_receiving) > 0)
-		complete(&ep->re_done);
-
-out:
-	trace_xprtrdma_post_recvs(r_xprt, count, rc);
 	if (rc) {
 		for (wr = bad_wr; wr;) {
 			struct rpcrdma_rep *rep;
@@ -1431,6 +1426,11 @@ void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, int needed, bool temp)
 			--count;
 		}
 	}
+	if (atomic_dec_return(&ep->re_receiving) > 0)
+		complete(&ep->re_done);
+
+out:
+	trace_xprtrdma_post_recvs(r_xprt, count, rc);
 	ep->re_receive_count += count;
 	return;
 }
-- 
2.30.2